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Victor Zverovich a5c1b5d440 Update changelog

2024-06-10 11:30:21 -07:00

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Raw Blame History

11.0.0 - TBD

Improved C++20 module support (https://github.com/fmtlib/fmt/pull/3991, https://github.com/fmtlib/fmt/pull/3997, https://github.com/fmtlib/fmt/pull/3998). Thanks @yujincheng08.
Added an option to replace standard includes with import std enabled via the FMT_IMPORT_STD macro (https://github.com/fmtlib/fmt/issues/3921, https://github.com/fmtlib/fmt/pull/3928). Thanks @matt77hias.
Exported range_format and range_format_kind from the fmt module (https://github.com/fmtlib/fmt/pull/3970). Thanks @matt77hias.
Added formatters for std::chrono::day, std::chrono::month, std::chrono::year and std::chrono::year_month_day (https://github.com/fmtlib/fmt/issues/3758, https://github.com/fmtlib/fmt/issues/3772, https://github.com/fmtlib/fmt/pull/3906). For example:
```
#include <fmt/chrono.h>
#include <fmt/color.h>

int main() {
  fmt::print(fg(fmt::color::green), "{}\n", std::chrono::day(7));
}
```
prints a green day:

Thanks @zivshek.
Fixed handling of precision in %S (https://github.com/fmtlib/fmt/issues/3794, https://github.com/fmtlib/fmt/pull/3814). Thanks @js324.
Added support for the - specifier (glibc strftime extension) to day of the month (%d) and week of the year (%W, %U, %V) specifiers (https://github.com/fmtlib/fmt/pull/3976). Thanks @ZaheenJ.
Fixed the scope of the - extension in chrono formatting so that it doesn't apply to subsequent specifiers (https://github.com/fmtlib/fmt/issues/3811, https://github.com/fmtlib/fmt/pull/3812). Thanks @phprus.
Improved handling of time_point::min() (https://github.com/fmtlib/fmt/issues/3282).
Added a formatter for std::expected (https://github.com/fmtlib/fmt/pull/3834. Thanks @dominicpoeschko.
Added a formatter for std::complex (https://github.com/fmtlib/fmt/issues/1467, https://github.com/fmtlib/fmt/issues/3886, https://github.com/fmtlib/fmt/pull/3892, https://github.com/fmtlib/fmt/pull/3900). Thanks @phprus.
Added a formatter for std::type_info (https://github.com/fmtlib/fmt/pull/3978). Thanks @matt77hias.
Specialized formatter for std::basic_string types with custom traits and allocators (https://github.com/fmtlib/fmt/issues/3938, https://github.com/fmtlib/fmt/pull/3943). Thanks @dieram3.
Improved safety of format_to when writting to an array (https://github.com/fmtlib/fmt/pull/3805). Thanks @ThePhD.
Added support for character range formatting (https://github.com/fmtlib/fmt/issues/3857, https://github.com/fmtlib/fmt/pull/3863). Thanks @js324.
Enabled ADL for begin and end in fmt::join (https://github.com/fmtlib/fmt/issues/3813, https://github.com/fmtlib/fmt/pull/3824). Thanks @bbolli.
Made contiguous iterator optimizations apply to std::basic_string iterators (https://github.com/fmtlib/fmt/pull/3798). Thanks @phprus.
Added support for ranges with mutable begin and end (https://github.com/fmtlib/fmt/issues/3752, https://github.com/fmtlib/fmt/pull/3800, https://github.com/fmtlib/fmt/pull/3955). Thanks @tcbrindle and @Arghnews.
Added support for move-only iterators to fmt::join (https://github.com/fmtlib/fmt/issues/3802, https://github.com/fmtlib/fmt/pull/3946). Thanks @Arghnews.
Fixed hanling of types with begin returning void such as Eigen matrices (https://github.com/fmtlib/fmt/pull/3964). Thanks @Arghnews.
Added a formattable concept (https://github.com/fmtlib/fmt/pull/3974). Thanks @matt77hias.
Removed dependency on <memory> for std::allocator_traits when possible (https://github.com/fmtlib/fmt/pull/3804). Thanks @phprus.
Added support for __float128 (https://github.com/fmtlib/fmt/issues/3494).
Fixed rounding issues when formatting long double with fixed precision (https://github.com/fmtlib/fmt/issues/3539).
Made fmt::isnan not trigger floating-point exception for NaN values (https://github.com/fmtlib/fmt/issues/3948, https://github.com/fmtlib/fmt/pull/3951). Thanks @alexdewar.
Made iterator_buffer's move constructor noexcept (https://github.com/fmtlib/fmt/pull/3808). Thanks @waywardmonkeys.
Started enforcing that formatter::format is const for compatibility with std::format (https://github.com/fmtlib/fmt/issues/3447).
Made fmt::basic_string_view not constructible from nullptr for consistency with std::string_view in C++23 (https://github.com/fmtlib/fmt/pull/3846). Thanks @dalle.
Fixed group_digits for negative integers (https://github.com/fmtlib/fmt/issues/3891, https://github.com/fmtlib/fmt/pull/3901). Thanks @phprus.
Fixed handling of negative ids in basic_format_args::get (https://github.com/fmtlib/fmt/pull/3945). Thanks @marlenecota.
Improved named argument validation (https://github.com/fmtlib/fmt/issues/3817).
Disabled copy contruction/assignment for format_arg_store and fixed moved construction (https://github.com/fmtlib/fmt/pull/3833). Thanks @ivafanas.
Worked around a locale issue in RHEL/devtoolset (https://github.com/fmtlib/fmt/issues/3858, https://github.com/fmtlib/fmt/pull/3859). Thanks @g199209.
Added RTTI detection for MSVC (https://github.com/fmtlib/fmt/pull/3821, https://github.com/fmtlib/fmt/pull/3963). Thanks @edo9300.
Improved documentation and README (https://github.com/fmtlib/fmt/issues/3775, https://github.com/fmtlib/fmt/pull/3784, https://github.com/fmtlib/fmt/issues/3788, https://github.com/fmtlib/fmt/pull/3789, https://github.com/fmtlib/fmt/pull/3793, https://github.com/fmtlib/fmt/issues/3818, https://github.com/fmtlib/fmt/pull/3820, https://github.com/fmtlib/fmt/pull/3822, https://github.com/fmtlib/fmt/pull/3843, https://github.com/fmtlib/fmt/pull/3890, https://github.com/fmtlib/fmt/issues/3894, https://github.com/fmtlib/fmt/pull/3895, https://github.com/fmtlib/fmt/pull/3905, https://github.com/fmtlib/fmt/issues/3942). Thanks @zencatalyst, WolleTD, @tupaschoal, @Dobiasd, @frank-weinberg, @bbolli, @phprus, @waywardmonkeys and @js324.
Improved CI and tests (https://github.com/fmtlib/fmt/issues/3878, https://github.com/fmtlib/fmt/pull/3883, https://github.com/fmtlib/fmt/issues/3897, https://github.com/fmtlib/fmt/pull/3979, https://github.com/fmtlib/fmt/pull/3980, https://github.com/fmtlib/fmt/pull/3988). Thanks @vgorrX, @waywardmonkeys, @tchaikov and @phprus.
Fixed buffer overflow when using format string compilation with debug format and std::back_insert_iterator (https://github.com/fmtlib/fmt/issues/3795, https://github.com/fmtlib/fmt/pull/3797). Thanks @phprus.
Improved Bazel support (https://github.com/fmtlib/fmt/pull/3792, https://github.com/fmtlib/fmt/pull/3801, https://github.com/fmtlib/fmt/pull/3962, https://github.com/fmtlib/fmt/pull/3965). Thanks @Vertexwahn.
Improved/fixed the CMake config (https://github.com/fmtlib/fmt/issues/3777, https://github.com/fmtlib/fmt/pull/3783, https://github.com/fmtlib/fmt/issues/3847, https://github.com/fmtlib/fmt/pull/3907). Thanks @phprus and @xTachyon.
Fixed various warnings and compilation issues (https://github.com/fmtlib/fmt/issues/3769, https://github.com/fmtlib/fmt/issues/3796, https://github.com/fmtlib/fmt/issues/3803, https://github.com/fmtlib/fmt/pull/3806, https://github.com/fmtlib/fmt/pull/3807, https://github.com/fmtlib/fmt/issues/3809, https://github.com/fmtlib/fmt/pull/3810, https://github.com/fmtlib/fmt/issues/3830, https://github.com/fmtlib/fmt/pull/3832, https://github.com/fmtlib/fmt/issues/3835, https://github.com/fmtlib/fmt/pull/3844, https://github.com/fmtlib/fmt/issues/3854, https://github.com/fmtlib/fmt/pull/3856, https://github.com/fmtlib/fmt/pull/3865, https://github.com/fmtlib/fmt/pull/3866, https://github.com/fmtlib/fmt/pull/3880, https://github.com/fmtlib/fmt/issues/3881, https://github.com/fmtlib/fmt/issues/3884, https://github.com/fmtlib/fmt/issues/3898, https://github.com/fmtlib/fmt/pull/3899, https://github.com/fmtlib/fmt/pull/3909, https://github.com/fmtlib/fmt/pull/3917, https://github.com/fmtlib/fmt/pull/3923, https://github.com/fmtlib/fmt/pull/3924, https://github.com/fmtlib/fmt/issues/3925, https://github.com/fmtlib/fmt/pull/3930, https://github.com/fmtlib/fmt/pull/3931, https://github.com/fmtlib/fmt/issues/3935, https://github.com/fmtlib/fmt/pull/3937, https://github.com/fmtlib/fmt/pull/3967, https://github.com/fmtlib/fmt/pull/3968, https://github.com/fmtlib/fmt/pull/3972, https://github.com/fmtlib/fmt/pull/3983,). Thanks @hmbj, @phprus, @res2k, @Baardi, @matt77hias, @waywardmonkeys, @hmbj, @yakra, @prlw1, @Arghnews, @mtillmann0, @ShifftC and @eepp.

10.2.1 - 2024-01-04

Fixed ABI compatibility with earlier 10.x versions (https://github.com/fmtlib/fmt/issues/3785, https://github.com/fmtlib/fmt/pull/3786). Thanks @saraedum.

10.2.0 - 2024-01-01

Added support for the %j specifier (the number of days) for std::chrono::duration (https://github.com/fmtlib/fmt/issues/3643, https://github.com/fmtlib/fmt/pull/3732). Thanks @intelfx.
Added support for the chrono suffix for days and changed the suffix for minutes from "m" to the correct "min" (https://github.com/fmtlib/fmt/issues/3662, https://github.com/fmtlib/fmt/pull/3664). For example (godbolt):
```
#include <fmt/chrono.h>

int main() {
  fmt::print("{}\n", std::chrono::days(42)); // prints "42d"
}
```
Thanks @Richardk2n.
Fixed an overflow in std::chrono::time_point formatting with large dates (https://github.com/fmtlib/fmt/issues/3725, https://github.com/fmtlib/fmt/pull/3727). Thanks @cschreib.

Added a formatter for std::source_location (https://github.com/fmtlib/fmt/pull/3730). For example (godbolt):

#include <source_location>
#include <fmt/std.h>

int main() {
  fmt::print("{}\n", std::source_location::current());
}

prints

/app/example.cpp:5:51: int main()

Thanks @felix642.

Added a formatter for std::bitset (https://github.com/fmtlib/fmt/pull/3660). For example (godbolt):

#include <bitset>
#include <fmt/std.h>

int main() {
  fmt::print("{}\n", std::bitset<6>(42)); // prints "101010"
}

Thanks @muggenhor.

Added an experimental nested_formatter that provides an easy way of applying a formatter to one or more subobjects while automatically handling width, fill and alignment. For example:

#include <fmt/format.h>

struct point {
  double x, y;
};

template <>
struct fmt::formatter<point> : nested_formatter<double> {
  auto format(point p, format_context& ctx) const {
    return write_padded(ctx, [=](auto out) {
      return format_to(out, "({}, {})", nested(p.x), nested(p.y));
    });
  }
};

int main() {
  fmt::print("[{:>20.2f}]", point{1, 2});
}

prints

[          (1.00, 2.00)]

Added the generic representation (g) to std::filesystem::path (https://github.com/fmtlib/fmt/issues/3715, https://github.com/fmtlib/fmt/pull/3729). For example:
```
#include <filesystem>
#include <fmt/std.h>

int main() {
  fmt::print("{:g}\n", std::filesystem::path("C:\\foo"));
}
```
prints "C:/foo" on Windows.

Thanks @js324.
Made format_as work with references (https://github.com/fmtlib/fmt/pull/3739). Thanks @tchaikov.
Fixed formatting of invalid UTF-8 with precision (https://github.com/fmtlib/fmt/issues/3284).
Fixed an inconsistency between fmt::to_string and fmt::format (https://github.com/fmtlib/fmt/issues/3684).
Disallowed unsafe uses of fmt::styled (https://github.com/fmtlib/fmt/issues/3625):
```
auto s = fmt::styled(std::string("dangle"), fmt::emphasis::bold);
fmt::print("{}\n", s); // compile error
```
Pass fmt::styled(...) as a parameter instead.
Added a null check when formatting a C string with the s specifier (https://github.com/fmtlib/fmt/issues/3706).
Disallowed the c specifier for bool (https://github.com/fmtlib/fmt/issues/3726, https://github.com/fmtlib/fmt/pull/3734). Thanks @js324.
Made the default formatting unlocalized in fmt::ostream_formatter for consistency with the rest of the library (https://github.com/fmtlib/fmt/issues/3460).
Fixed localized formatting in bases other than decimal (https://github.com/fmtlib/fmt/issues/3693, https://github.com/fmtlib/fmt/pull/3750). Thanks @js324.
Fixed a performance regression in experimental fmt::ostream::print (https://github.com/fmtlib/fmt/issues/3674).
Added synchronization with the underlying output stream when writing to the Windows console (https://github.com/fmtlib/fmt/pull/3668, https://github.com/fmtlib/fmt/issues/3688, https://github.com/fmtlib/fmt/pull/3689). Thanks @Roman-Koshelev and @dimztimz.
Changed to only export format_error when {fmt} is built as a shared library (https://github.com/fmtlib/fmt/issues/3626, https://github.com/fmtlib/fmt/pull/3627). Thanks @phprus.
Made fmt::streamed constexpr. (https://github.com/fmtlib/fmt/pull/3650). Thanks @muggenhor.
Enabled consteval on older versions of MSVC (https://github.com/fmtlib/fmt/pull/3757). Thanks @phprus.
Added an option to build without wchar_t support on Windows (https://github.com/fmtlib/fmt/issues/3631, https://github.com/fmtlib/fmt/pull/3636). Thanks @glebm.
Improved build and CI configuration (https://github.com/fmtlib/fmt/pull/3679, https://github.com/fmtlib/fmt/issues/3701, https://github.com/fmtlib/fmt/pull/3702, https://github.com/fmtlib/fmt/pull/3749). Thanks @jcar87, @pklima and @tchaikov.
Fixed various warnings, compilation and test issues (https://github.com/fmtlib/fmt/issues/3607, https://github.com/fmtlib/fmt/pull/3610, https://github.com/fmtlib/fmt/pull/3624, https://github.com/fmtlib/fmt/pull/3630, https://github.com/fmtlib/fmt/pull/3634, https://github.com/fmtlib/fmt/pull/3638, https://github.com/fmtlib/fmt/issues/3645, https://github.com/fmtlib/fmt/issues/3646, https://github.com/fmtlib/fmt/pull/3647, https://github.com/fmtlib/fmt/pull/3652, https://github.com/fmtlib/fmt/issues/3654, https://github.com/fmtlib/fmt/pull/3663, https://github.com/fmtlib/fmt/issues/3670, https://github.com/fmtlib/fmt/pull/3680, https://github.com/fmtlib/fmt/issues/3694, https://github.com/fmtlib/fmt/pull/3695, https://github.com/fmtlib/fmt/pull/3699, https://github.com/fmtlib/fmt/issues/3705, https://github.com/fmtlib/fmt/issues/3710, https://github.com/fmtlib/fmt/issues/3712, https://github.com/fmtlib/fmt/pull/3713, https://github.com/fmtlib/fmt/issues/3714, https://github.com/fmtlib/fmt/pull/3716, https://github.com/fmtlib/fmt/pull/3723, https://github.com/fmtlib/fmt/issues/3738, https://github.com/fmtlib/fmt/issues/3740, https://github.com/fmtlib/fmt/pull/3741, https://github.com/fmtlib/fmt/pull/3743, https://github.com/fmtlib/fmt/issues/3745, https://github.com/fmtlib/fmt/pull/3747, https://github.com/fmtlib/fmt/pull/3748, https://github.com/fmtlib/fmt/pull/3751, https://github.com/fmtlib/fmt/pull/3754, https://github.com/fmtlib/fmt/pull/3755, https://github.com/fmtlib/fmt/issues/3760, https://github.com/fmtlib/fmt/pull/3762, https://github.com/fmtlib/fmt/issues/3763, https://github.com/fmtlib/fmt/pull/3764, https://github.com/fmtlib/fmt/issues/3774, https://github.com/fmtlib/fmt/pull/3779). Thanks @danakj, @vinayyadav3016, @cyyever, @phprus, @qimiko, @saschasc, @gsjaardema, @lazka, @Zhaojun-Liu, @carlsmedstad, @hotwatermorning, @cptFracassa, @kuguma, @PeterJohnson, @H1X4Dev, @asantoni, @eltociear, @msimberg, @tchaikov, @waywardmonkeys.
Improved documentation and README (https://github.com/fmtlib/fmt/issues/2086, https://github.com/fmtlib/fmt/issues/3637, https://github.com/fmtlib/fmt/pull/3642, https://github.com/fmtlib/fmt/pull/3653, https://github.com/fmtlib/fmt/pull/3655, https://github.com/fmtlib/fmt/pull/3661, https://github.com/fmtlib/fmt/issues/3673, https://github.com/fmtlib/fmt/pull/3677, https://github.com/fmtlib/fmt/pull/3737, https://github.com/fmtlib/fmt/issues/3742, https://github.com/fmtlib/fmt/pull/3744). Thanks @idzm, @perlun, @joycebrum, @fennewald, @reinhardt1053, @GeorgeLS.
Updated CI dependencies (https://github.com/fmtlib/fmt/pull/3615, https://github.com/fmtlib/fmt/pull/3622, https://github.com/fmtlib/fmt/pull/3623, https://github.com/fmtlib/fmt/pull/3666, https://github.com/fmtlib/fmt/pull/3696, https://github.com/fmtlib/fmt/pull/3697, https://github.com/fmtlib/fmt/pull/3759, https://github.com/fmtlib/fmt/pull/3782).

10.1.1 - 2023-08-28

Added formatters for std::atomic and atomic_flag (https://github.com/fmtlib/fmt/pull/3574, https://github.com/fmtlib/fmt/pull/3594). Thanks @wangzw and @AlexGuteniev.
Fixed an error about partial specialization of formatter<string> after instantiation when compiled with gcc and C++20 (https://github.com/fmtlib/fmt/issues/3584).
Fixed compilation as a C++20 module with gcc and clang (https://github.com/fmtlib/fmt/issues/3587, https://github.com/fmtlib/fmt/pull/3597, https://github.com/fmtlib/fmt/pull/3605). Thanks @MathewBensonCode.
Made fmt::to_string work with types that have format_as overloads (https://github.com/fmtlib/fmt/pull/3575). Thanks @phprus.
Made formatted_size work with integral format specifiers at compile time (https://github.com/fmtlib/fmt/pull/3591). Thanks @elbeno.
Fixed a warning about the no_unique_address attribute on clang-cl (https://github.com/fmtlib/fmt/pull/3599). Thanks @lukester1975.
Improved compatibility with the legacy GBK encoding (https://github.com/fmtlib/fmt/issues/3598, https://github.com/fmtlib/fmt/pull/3599). Thanks @YuHuanTin.
Added OpenSSF Scorecard analysis (https://github.com/fmtlib/fmt/issues/3530, https://github.com/fmtlib/fmt/pull/3571). Thanks @joycebrum.
Updated CI dependencies (https://github.com/fmtlib/fmt/pull/3591, https://github.com/fmtlib/fmt/pull/3592, https://github.com/fmtlib/fmt/pull/3593, https://github.com/fmtlib/fmt/pull/3602).

10.1.0 - 2023-08-12

Optimized format string compilation resulting in up to 40% speed up in compiled format_to and ~4x speed up in compiled format_to_n on a concatenation benchmark (https://github.com/fmtlib/fmt/issues/3133, https://github.com/fmtlib/fmt/issues/3484).

{fmt} 10.0:

---------------------------------------------------------
Benchmark               Time             CPU   Iterations
---------------------------------------------------------
BM_format_to         78.9 ns         78.9 ns      8881746
BM_format_to_n        568 ns          568 ns      1232089

{fmt} 10.1:

---------------------------------------------------------
Benchmark               Time             CPU   Iterations
---------------------------------------------------------
BM_format_to         54.9 ns         54.9 ns     12727944
BM_format_to_n        133 ns          133 ns      5257795

Optimized storage of an empty allocator in basic_memory_buffer (https://github.com/fmtlib/fmt/pull/3485). Thanks @Minty-Meeo.
Added formatters for proxy references to elements of std::vector<bool> and std::bitset<N> (https://github.com/fmtlib/fmt/issues/3567, https://github.com/fmtlib/fmt/pull/3570). For example (godbolt):
```
#include <vector>
#include <fmt/std.h>

int main() {
  auto v = std::vector<bool>{true};
  fmt::print("{}", v[0]);
}
```
Thanks @phprus and @felix642.
Fixed an ambiguous formatter specialization for containers that look like container adaptors such as boost::flat_set (https://github.com/fmtlib/fmt/issues/3556, https://github.com/fmtlib/fmt/pull/3561). Thanks @5chmidti.
Fixed compilation when formatting durations not convertible from std::chrono::seconds (https://github.com/fmtlib/fmt/pull/3430). Thanks @patlkli.
Made the formatter specialization for char* const-correct (https://github.com/fmtlib/fmt/pull/3432). Thanks @timsong-cpp.
Made {} and {:} handled consistently during compile-time checks (https://github.com/fmtlib/fmt/issues/3526).
Disallowed passing temporaries to make_format_args to improve API safety by preventing dangling references.
Improved the compile-time error for unformattable types (https://github.com/fmtlib/fmt/pull/3478). Thanks @BRevzin.
Improved the floating-point formatter (https://github.com/fmtlib/fmt/pull/3448, https://github.com/fmtlib/fmt/pull/3450). Thanks @florimond-collette.
Fixed handling of precision for long double larger than 64 bits. (https://github.com/fmtlib/fmt/issues/3539, https://github.com/fmtlib/fmt/issues/3564).
Made floating-point and chrono tests less platform-dependent (https://github.com/fmtlib/fmt/issues/3337, https://github.com/fmtlib/fmt/issues/3433, https://github.com/fmtlib/fmt/pull/3434). Thanks @phprus.
Removed the remnants of the Grisu floating-point formatter that has been replaced by Dragonbox in earlier versions.
Added throw_format_error to the public API (https://github.com/fmtlib/fmt/pull/3551). Thanks @mjerabek.
Made FMT_THROW assert even if assertions are disabled when compiling with exceptions disabled (https://github.com/fmtlib/fmt/issues/3418, https://github.com/fmtlib/fmt/pull/3439). Thanks @BRevzin.
Made format_as and std::filesystem::path formatter work with exotic code unit types. (https://github.com/fmtlib/fmt/pull/3457, https://github.com/fmtlib/fmt/pull/3476). Thanks @gix and @hmbj.
Added support for the ? format specifier to std::filesystem::path and made the default unescaped for consistency with strings.
Deprecated the wide stream overload of printf.
Removed unused basic_printf_parse_context.
Improved RTTI detection used when formatting exceptions (https://github.com/fmtlib/fmt/pull/3468). Thanks @danakj.
Improved compatibility with VxWorks7 (https://github.com/fmtlib/fmt/pull/3467). Thanks @wenshan1.
Improved documentation (https://github.com/fmtlib/fmt/issues/3174, https://github.com/fmtlib/fmt/issues/3423, https://github.com/fmtlib/fmt/pull/3454, https://github.com/fmtlib/fmt/issues/3458, https://github.com/fmtlib/fmt/pull/3461, https://github.com/fmtlib/fmt/issues/3487, https://github.com/fmtlib/fmt/pull/3515). Thanks @zencatalyst, @rlalik and @mikecrowe.
Improved build and CI configurations (https://github.com/fmtlib/fmt/issues/3449, https://github.com/fmtlib/fmt/pull/3451, https://github.com/fmtlib/fmt/pull/3452, https://github.com/fmtlib/fmt/pull/3453, https://github.com/fmtlib/fmt/pull/3459, https://github.com/fmtlib/fmt/issues/3481, https://github.com/fmtlib/fmt/pull/3486, https://github.com/fmtlib/fmt/issues/3489, https://github.com/fmtlib/fmt/pull/3496, https://github.com/fmtlib/fmt/issues/3517, https://github.com/fmtlib/fmt/pull/3523, https://github.com/fmtlib/fmt/pull/3563). Thanks @joycebrum, @glebm, @phprus, @petrmanek, @setoye and @abouvier.
Fixed various warnings and compilation issues (https://github.com/fmtlib/fmt/issues/3408, https://github.com/fmtlib/fmt/issues/3424, https://github.com/fmtlib/fmt/issues/3444, https://github.com/fmtlib/fmt/pull/3446, https://github.com/fmtlib/fmt/pull/3475, https://github.com/fmtlib/fmt/pull/3482, https://github.com/fmtlib/fmt/issues/3492, https://github.com/fmtlib/fmt/pull/3493, https://github.com/fmtlib/fmt/pull/3508, https://github.com/fmtlib/fmt/issues/3509, https://github.com/fmtlib/fmt/issues/3533, https://github.com/fmtlib/fmt/pull/3542, https://github.com/fmtlib/fmt/issues/3543, https://github.com/fmtlib/fmt/issues/3540, https://github.com/fmtlib/fmt/pull/3544, https://github.com/fmtlib/fmt/issues/3548, https://github.com/fmtlib/fmt/pull/3549, https://github.com/fmtlib/fmt/pull/3550, https://github.com/fmtlib/fmt/pull/3552). Thanks @adesitter, @hmbj, @Minty-Meeo, @phprus, @TobiSchluter, @kieranclancy, @alexeedm, @jurihock, @Ozomahtli and @razaqq.

10.0.0 - 2023-05-09

Replaced Grisu with a new floating-point formatting algorithm for given precision (https://github.com/fmtlib/fmt/issues/3262, https://github.com/fmtlib/fmt/issues/2750, https://github.com/fmtlib/fmt/pull/3269, https://github.com/fmtlib/fmt/pull/3276). The new algorithm is based on Dragonbox already used for the shortest representation and gives substantial performance improvement:
- Red: new algorithm
- Green: new algorithm with FMT_USE_FULL_CACHE_DRAGONBOX defined to 1
- Blue: old algorithm
Thanks @jk-jeon.
Replaced snprintf-based hex float formatter with an internal implementation (https://github.com/fmtlib/fmt/pull/3179, https://github.com/fmtlib/fmt/pull/3203). This removes the last usage of s(n)printf in {fmt}. Thanks @phprus.
Fixed alignment of floating-point numbers with localization (https://github.com/fmtlib/fmt/issues/3263, https://github.com/fmtlib/fmt/pull/3272). Thanks @ShawnZhong.
Made handling of # consistent with std::format.
Improved C++20 module support (https://github.com/fmtlib/fmt/pull/3134, https://github.com/fmtlib/fmt/pull/3254, https://github.com/fmtlib/fmt/pull/3386, https://github.com/fmtlib/fmt/pull/3387, https://github.com/fmtlib/fmt/pull/3388, https://github.com/fmtlib/fmt/pull/3392, https://github.com/fmtlib/fmt/pull/3397, https://github.com/fmtlib/fmt/pull/3399, https://github.com/fmtlib/fmt/pull/3400). Thanks @laitingsheng, @Orvid and @DanielaE.
Switched to the modules CMake library which allows building {fmt} as a C++20 module with clang:
```
CXX=clang++ cmake -DFMT_MODULE=ON .
make
```

Made format_as work with any user-defined type and not just enums. For example (godbolt):

#include <fmt/format.h>

struct floaty_mc_floatface {
  double value;
};

auto format_as(floaty_mc_floatface f) { return f.value; }

int main() {
  fmt::print("{:8}\n", floaty_mc_floatface{0.42}); // prints "    0.42"
}

Removed deprecated implicit conversions for enums and conversions to primitive types for compatibility with std::format and to prevent potential ODR violations. Use format_as instead.
Added support for fill, align and width to the time point formatter (https://github.com/fmtlib/fmt/issues/3237, https://github.com/fmtlib/fmt/pull/3260, https://github.com/fmtlib/fmt/pull/3275). For example (godbolt):
```
#include <fmt/chrono.h>

int main() {
  // prints "    2023"
  fmt::print("{:>8%Y}\n", std::chrono::system_clock::now());
}
```
Thanks @ShawnZhong.
Implemented formatting of subseconds (https://github.com/fmtlib/fmt/issues/2207, https://github.com/fmtlib/fmt/issues/3117, https://github.com/fmtlib/fmt/pull/3115, https://github.com/fmtlib/fmt/pull/3143, https://github.com/fmtlib/fmt/pull/3144, https://github.com/fmtlib/fmt/pull/3349). For example (godbolt):
```
#include <fmt/chrono.h>

int main() {
  // prints 01.234567
  fmt::print("{:%S}\n", std::chrono::microseconds(1234567));
}
```
Thanks @patrickroocks @phprus and @BRevzin.
Added precision support to %S (https://github.com/fmtlib/fmt/pull/3148). Thanks @SappyJoy
Added support for std::utc_time (https://github.com/fmtlib/fmt/issues/3098, https://github.com/fmtlib/fmt/pull/3110). Thanks @patrickroocks.
Switched formatting of std::chrono::system_clock from local time to UTC for compatibility with the standard (https://github.com/fmtlib/fmt/issues/3199, https://github.com/fmtlib/fmt/pull/3230). Thanks @ned14.
Added support for %Ez and %Oz to chrono formatters. (https://github.com/fmtlib/fmt/issues/3220, https://github.com/fmtlib/fmt/pull/3222). Thanks @phprus.
Improved validation of format specifiers for std::chrono::duration (https://github.com/fmtlib/fmt/issues/3219, https://github.com/fmtlib/fmt/pull/3232). Thanks @ShawnZhong.

Fixed formatting of time points before the epoch (https://github.com/fmtlib/fmt/issues/3117, https://github.com/fmtlib/fmt/pull/3261). For example (godbolt):

#include <fmt/chrono.h>

int main() {
  auto t = std::chrono::system_clock::from_time_t(0) -
           std::chrono::milliseconds(250);
  fmt::print("{:%S}\n", t); // prints 59.750000000
}

Thanks @ShawnZhong.

Experimental: implemented glibc extension for padding seconds, minutes and hours (https://github.com/fmtlib/fmt/issues/2959, https://github.com/fmtlib/fmt/pull/3271). Thanks @ShawnZhong.
Added a formatter for std::exception (https://github.com/fmtlib/fmt/issues/2977, https://github.com/fmtlib/fmt/issues/3012, https://github.com/fmtlib/fmt/pull/3062, https://github.com/fmtlib/fmt/pull/3076, https://github.com/fmtlib/fmt/pull/3119). For example (godbolt):
```
#include <fmt/std.h>
#include <vector>

int main() {
  try {
    std::vector<bool>().at(0);
  } catch(const std::exception& e) {
    fmt::print("{}", e);
  }
}
```
prints:
```
vector<bool>::_M_range_check: __n (which is 0) >= this->size() (which is 0)
```
on libstdc++. Thanks @zach2good and @phprus.
Moved std::error_code formatter from fmt/os.h to fmt/std.h. (https://github.com/fmtlib/fmt/pull/3125). Thanks @phprus.

Added formatters for standard container adapters: std::priority_queue, std::queue and std::stack (https://github.com/fmtlib/fmt/issues/3215, https://github.com/fmtlib/fmt/pull/3279). For example (godbolt):

#include <fmt/ranges.h>
#include <stack>
#include <vector>

int main() {
  auto s = std::stack<bool, std::vector<bool>>();
  for (auto b: {true, false, true}) s.push(b);
  fmt::print("{}\n", s); // prints [true, false, true]
}

Thanks @ShawnZhong.

Added a formatter for std::optional to fmt/std.h (https://github.com/fmtlib/fmt/issues/1367, https://github.com/fmtlib/fmt/pull/3303). Thanks @tom-huntington.
Fixed formatting of valueless by exception variants (https://github.com/fmtlib/fmt/pull/3347). Thanks @TheOmegaCarrot.
Made fmt::ptr accept unique_ptr with a custom deleter (https://github.com/fmtlib/fmt/pull/3177). Thanks @hmbj.
Fixed formatting of noncopyable ranges and nested ranges of chars (https://github.com/fmtlib/fmt/pull/3158 https://github.com/fmtlib/fmt/issues/3286, https://github.com/fmtlib/fmt/pull/3290). Thanks @BRevzin.
Fixed issues with formatting of paths and ranges of paths (https://github.com/fmtlib/fmt/issues/3319, https://github.com/fmtlib/fmt/pull/3321 https://github.com/fmtlib/fmt/issues/3322). Thanks @phprus.
Improved handling of invalid Unicode in paths.
Enabled compile-time checks on Apple clang 14 and later (https://github.com/fmtlib/fmt/pull/3331). Thanks @cloyce.
Improved compile-time checks of named arguments (https://github.com/fmtlib/fmt/issues/3105, https://github.com/fmtlib/fmt/pull/3214). Thanks @rbrich.
Fixed formatting when both alignment and 0 are given (https://github.com/fmtlib/fmt/issues/3236, https://github.com/fmtlib/fmt/pull/3248). Thanks @ShawnZhong.
Improved Unicode support in the experimental file API on Windows (https://github.com/fmtlib/fmt/issues/3234, https://github.com/fmtlib/fmt/pull/3293). Thanks @Fros1er.
Unified UTF transcoding (https://github.com/fmtlib/fmt/pull/3416). Thanks @phprus.
Added support for UTF-8 digit separators via an experimental locale facet (https://github.com/fmtlib/fmt/issues/1861). For example (godbolt):
```
auto loc = std::locale(
  std::locale(), new fmt::format_facet<std::locale>("’"));
auto s = fmt::format(loc, "{:L}", 1000);
```
where ’ is U+2019 used as a digit separator in the de_CH locale.
Added an overload of formatted_size that takes a locale (https://github.com/fmtlib/fmt/issues/3084, https://github.com/fmtlib/fmt/pull/3087). Thanks @gerboengels.
Removed the deprecated FMT_DEPRECATED_OSTREAM.
Fixed a UB when using a null std::string_view with fmt::to_string or format string compilation (https://github.com/fmtlib/fmt/issues/3241, https://github.com/fmtlib/fmt/pull/3244). Thanks @phprus.
Added starts_with to the fallback string_view implementation (https://github.com/fmtlib/fmt/pull/3080). Thanks @phprus.
Added fmt::basic_format_string::get() for compatibility with basic_format_string (https://github.com/fmtlib/fmt/pull/3111). Thanks @huangqinjin.
Added println for compatibility with C++23 (https://github.com/fmtlib/fmt/pull/3267). Thanks @ShawnZhong.
Renamed the FMT_EXPORT macro for shared library usage to FMT_LIB_EXPORT.
Improved documentation (https://github.com/fmtlib/fmt/issues/3108, https://github.com/fmtlib/fmt/issues/3169, https://github.com/fmtlib/fmt/pull/3243). https://github.com/fmtlib/fmt/pull/3404). Thanks @Cleroth and @Vertexwahn.
Improved build configuration and tests (https://github.com/fmtlib/fmt/pull/3118, https://github.com/fmtlib/fmt/pull/3120, https://github.com/fmtlib/fmt/pull/3188, https://github.com/fmtlib/fmt/issues/3189, https://github.com/fmtlib/fmt/pull/3198, https://github.com/fmtlib/fmt/pull/3205, https://github.com/fmtlib/fmt/pull/3207, https://github.com/fmtlib/fmt/pull/3210, https://github.com/fmtlib/fmt/pull/3240, https://github.com/fmtlib/fmt/pull/3256, https://github.com/fmtlib/fmt/pull/3264, https://github.com/fmtlib/fmt/issues/3299, https://github.com/fmtlib/fmt/pull/3302, https://github.com/fmtlib/fmt/pull/3312, https://github.com/fmtlib/fmt/issues/3317, https://github.com/fmtlib/fmt/pull/3328, https://github.com/fmtlib/fmt/pull/3333, https://github.com/fmtlib/fmt/pull/3369, https://github.com/fmtlib/fmt/issues/3373, https://github.com/fmtlib/fmt/pull/3395, https://github.com/fmtlib/fmt/pull/3406, https://github.com/fmtlib/fmt/pull/3411). Thanks @dimztimz, @phprus, @DavidKorczynski, @ChrisThrasher, @FrancoisCarouge, @kennyweiss, @luzpaz, @codeinred, @Mixaill, @joycebrum, @kevinhwang and @Vertexwahn.
Fixed a regression in handling empty format specifiers after a colon ({:}) (https://github.com/fmtlib/fmt/pull/3086). Thanks @oxidase.
Worked around a broken implementation of std::is_constant_evaluated in some versions of libstdc++ on clang (https://github.com/fmtlib/fmt/issues/3247, https://github.com/fmtlib/fmt/pull/3281). Thanks @phprus.
Fixed formatting of volatile variables (https://github.com/fmtlib/fmt/pull/3068).
Fixed various warnings and compilation issues (https://github.com/fmtlib/fmt/pull/3057, https://github.com/fmtlib/fmt/pull/3066, https://github.com/fmtlib/fmt/pull/3072, https://github.com/fmtlib/fmt/pull/3082, https://github.com/fmtlib/fmt/pull/3091, https://github.com/fmtlib/fmt/issues/3092, https://github.com/fmtlib/fmt/pull/3093, https://github.com/fmtlib/fmt/pull/3095, https://github.com/fmtlib/fmt/issues/3096, https://github.com/fmtlib/fmt/pull/3097, https://github.com/fmtlib/fmt/issues/3128, https://github.com/fmtlib/fmt/pull/3129, https://github.com/fmtlib/fmt/pull/3137, https://github.com/fmtlib/fmt/pull/3139, https://github.com/fmtlib/fmt/issues/3140, https://github.com/fmtlib/fmt/pull/3142, https://github.com/fmtlib/fmt/issues/3149, https://github.com/fmtlib/fmt/pull/3150, https://github.com/fmtlib/fmt/issues/3154, https://github.com/fmtlib/fmt/issues/3163, https://github.com/fmtlib/fmt/issues/3178, https://github.com/fmtlib/fmt/pull/3184, https://github.com/fmtlib/fmt/pull/3196, https://github.com/fmtlib/fmt/issues/3204, https://github.com/fmtlib/fmt/pull/3206, https://github.com/fmtlib/fmt/pull/3208, https://github.com/fmtlib/fmt/issues/3213, https://github.com/fmtlib/fmt/pull/3216, https://github.com/fmtlib/fmt/issues/3224, https://github.com/fmtlib/fmt/issues/3226, https://github.com/fmtlib/fmt/issues/3228, https://github.com/fmtlib/fmt/pull/3229, https://github.com/fmtlib/fmt/pull/3259, https://github.com/fmtlib/fmt/issues/3274, https://github.com/fmtlib/fmt/issues/3287, https://github.com/fmtlib/fmt/pull/3288, https://github.com/fmtlib/fmt/issues/3292, https://github.com/fmtlib/fmt/pull/3295, https://github.com/fmtlib/fmt/pull/3296, https://github.com/fmtlib/fmt/issues/3298, https://github.com/fmtlib/fmt/issues/3325, https://github.com/fmtlib/fmt/pull/3326, https://github.com/fmtlib/fmt/issues/3334, https://github.com/fmtlib/fmt/issues/3342, https://github.com/fmtlib/fmt/pull/3343, https://github.com/fmtlib/fmt/issues/3351, https://github.com/fmtlib/fmt/pull/3352, https://github.com/fmtlib/fmt/pull/3362, https://github.com/fmtlib/fmt/issues/3365, https://github.com/fmtlib/fmt/pull/3366, https://github.com/fmtlib/fmt/pull/3374, https://github.com/fmtlib/fmt/issues/3377, https://github.com/fmtlib/fmt/pull/3378, https://github.com/fmtlib/fmt/issues/3381, https://github.com/fmtlib/fmt/pull/3398, https://github.com/fmtlib/fmt/pull/3413, https://github.com/fmtlib/fmt/issues/3415). Thanks @phprus, @gsjaardema, @NewbieOrange, @EngineLessCC, @asmaloney, @HazardyKnusperkeks, @sergiud, @Youw, @thesmurph, @czudziakm, @Roman-Koshelev, @chronoxor, @ShawnZhong, @russelltg, @glebm, @tmartin-gh, @Zhaojun-Liu, @louiswins and @mogemimi.

9.1.0 - 2022-08-27

fmt::formatted_size now works at compile time (https://github.com/fmtlib/fmt/pull/3026). For example (godbolt):

#include <fmt/compile.h>

int main() {
  using namespace fmt::literals;
  constexpr size_t n = fmt::formatted_size("{}"_cf, 42);
  fmt::print("{}\n", n); // prints 2
}

Thanks @marksantaniello.

Fixed handling of invalid UTF-8 (https://github.com/fmtlib/fmt/pull/3038, https://github.com/fmtlib/fmt/pull/3044, https://github.com/fmtlib/fmt/pull/3056). Thanks @phprus and @skeeto.
Improved Unicode support in ostream overloads of print (https://github.com/fmtlib/fmt/pull/2994, https://github.com/fmtlib/fmt/pull/3001, https://github.com/fmtlib/fmt/pull/3025). Thanks @dimztimz.
Fixed handling of the sign specifier in localized formatting on systems with 32-bit wchar_t (https://github.com/fmtlib/fmt/issues/3041).
Added support for wide streams to fmt::streamed (https://github.com/fmtlib/fmt/pull/2994). Thanks @phprus.
Added the n specifier that disables the output of delimiters when formatting ranges (https://github.com/fmtlib/fmt/pull/2981, https://github.com/fmtlib/fmt/pull/2983). For example (godbolt):
```
#include <fmt/ranges.h>
#include <vector>

int main() {
  auto v = std::vector{1, 2, 3};
  fmt::print("{:n}\n", v); // prints 1, 2, 3
}
```
Thanks @BRevzin.
Worked around problematic std::string_view constructors introduced in C++23 (https://github.com/fmtlib/fmt/issues/3030, https://github.com/fmtlib/fmt/issues/3050). Thanks @strega-nil-ms.
Improve handling (exclusion) of recursive ranges (https://github.com/fmtlib/fmt/issues/2968, https://github.com/fmtlib/fmt/pull/2974). Thanks @Dani-Hub.
Improved error reporting in format string compilation (https://github.com/fmtlib/fmt/issues/3055).
Improved the implementation of Dragonbox, the algorithm used for the default floating-point formatting (https://github.com/fmtlib/fmt/pull/2984). Thanks @jk-jeon.
Fixed issues with floating-point formatting on exotic platforms.
Improved the implementation of chrono formatting (https://github.com/fmtlib/fmt/pull/3010). Thanks @phprus.
Improved documentation (https://github.com/fmtlib/fmt/pull/2966, https://github.com/fmtlib/fmt/pull/3009, https://github.com/fmtlib/fmt/issues/3020, https://github.com/fmtlib/fmt/pull/3037). Thanks @mwinterb, @jcelerier and @remiburtin.
Improved build configuration (https://github.com/fmtlib/fmt/pull/2991, https://github.com/fmtlib/fmt/pull/2995, https://github.com/fmtlib/fmt/issues/3004, https://github.com/fmtlib/fmt/pull/3007, https://github.com/fmtlib/fmt/pull/3040). Thanks @dimztimz and @hwhsu1231.
Fixed various warnings and compilation issues (https://github.com/fmtlib/fmt/issues/2969, https://github.com/fmtlib/fmt/pull/2971, https://github.com/fmtlib/fmt/issues/2975, https://github.com/fmtlib/fmt/pull/2982, https://github.com/fmtlib/fmt/pull/2985, https://github.com/fmtlib/fmt/issues/2988, https://github.com/fmtlib/fmt/issues/2989, https://github.com/fmtlib/fmt/issues/3000, https://github.com/fmtlib/fmt/issues/3006, https://github.com/fmtlib/fmt/issues/3014, https://github.com/fmtlib/fmt/issues/3015, https://github.com/fmtlib/fmt/pull/3021, https://github.com/fmtlib/fmt/issues/3023, https://github.com/fmtlib/fmt/pull/3024, https://github.com/fmtlib/fmt/pull/3029, https://github.com/fmtlib/fmt/pull/3043, https://github.com/fmtlib/fmt/issues/3052, https://github.com/fmtlib/fmt/pull/3053, https://github.com/fmtlib/fmt/pull/3054). Thanks @h-friederich, @dimztimz, @olupton, @bernhardmgruber and @phprus.

9.0.0 - 2022-07-04

Switched to the internal floating point formatter for all decimal presentation formats. In particular this results in consistent rounding on all platforms and removing the s[n]printf fallback for decimal FP formatting.

Compile-time floating point formatting no longer requires the header-only mode. For example (godbolt):

#include <array>
#include <fmt/compile.h>

consteval auto compile_time_dtoa(double value) -> std::array<char, 10> {
  auto result = std::array<char, 10>();
  fmt::format_to(result.data(), FMT_COMPILE("{}"), value);
  return result;
}

constexpr auto answer = compile_time_dtoa(0.42);

works with the default settings.

Improved the implementation of Dragonbox, the algorithm used for the default floating-point formatting (https://github.com/fmtlib/fmt/pull/2713, https://github.com/fmtlib/fmt/pull/2750). Thanks @jk-jeon.
Made fmt::to_string work with __float128. This uses the internal FP formatter and works even on system without __float128 support in [s]printf.
Disabled automatic std::ostream insertion operator (operator<<) discovery when fmt/ostream.h is included to prevent ODR violations. You can get the old behavior by defining FMT_DEPRECATED_OSTREAM but this will be removed in the next major release. Use fmt::streamed or fmt::ostream_formatter to enable formatting via std::ostream instead.

Added fmt::ostream_formatter that can be used to write formatter specializations that perform formatting via std::ostream. For example (godbolt):

#include <fmt/ostream.h>

struct date {
  int year, month, day;

  friend std::ostream& operator<<(std::ostream& os, const date& d) {
    return os << d.year << '-' << d.month << '-' << d.day;
  }
};

template <> struct fmt::formatter<date> : ostream_formatter {};

std::string s = fmt::format("The date is {}", date{2012, 12, 9});
// s == "The date is 2012-12-9"

Added the fmt::streamed function that takes an object and formats it via std::ostream. For example (godbolt):
```
#include <thread>
#include <fmt/ostream.h>

int main() {
  fmt::print("Current thread id: {}\n",
             fmt::streamed(std::this_thread::get_id()));
}
```
Note that fmt/std.h provides a formatter specialization for std::thread::id so you don't need to format it via std::ostream.
Deprecated implicit conversions of unscoped enums to integers for consistency with scoped enums.
Added an argument-dependent lookup based format_as extension API to simplify formatting of enums.

Added experimental std::variant formatting support (https://github.com/fmtlib/fmt/pull/2941). For example (godbolt):

#include <variant>
#include <fmt/std.h>

int main() {
  auto v = std::variant<int, std::string>(42);
  fmt::print("{}\n", v);
}

prints:

variant(42)

Thanks @jehelset.

Added experimental std::filesystem::path formatting support (https://github.com/fmtlib/fmt/issues/2865, https://github.com/fmtlib/fmt/pull/2902, https://github.com/fmtlib/fmt/issues/2917, https://github.com/fmtlib/fmt/pull/2918). For example (godbolt):
```
#include <filesystem>
#include <fmt/std.h>

int main() {
  fmt::print("There is no place like {}.", std::filesystem::path("/home"));
}
```
prints:
```
There is no place like "/home".
```
Thanks @phprus.

Added a std::thread::id formatter to fmt/std.h. For example (godbolt):

#include <thread>
#include <fmt/std.h>

int main() {
  fmt::print("Current thread id: {}\n", std::this_thread::get_id());
}

Added fmt::styled that applies a text style to an individual argument (https://github.com/fmtlib/fmt/pull/2793). For example (godbolt):

#include <fmt/chrono.h>
#include <fmt/color.h>

int main() {
  auto now = std::chrono::system_clock::now();
  fmt::print(
    "[{}] {}: {}\n",
    fmt::styled(now, fmt::emphasis::bold),
    fmt::styled("error", fg(fmt::color::red)),
    "something went wrong");
}

prints

Thanks @rbrugo.

Made fmt::print overload for text styles correctly handle UTF-8 (https://github.com/fmtlib/fmt/issues/2681, https://github.com/fmtlib/fmt/pull/2701). Thanks @AlexGuteniev.
Fixed Unicode handling when writing to an ostream.
Added support for nested specifiers to range formatting (https://github.com/fmtlib/fmt/pull/2673). For example (godbolt):
```
#include <vector>
#include <fmt/ranges.h>

int main() {
  fmt::print("{::#x}\n", std::vector{10, 20, 30});
}
```
prints [0xa, 0x14, 0x1e].

Thanks @BRevzin.
Implemented escaping of wide strings in ranges (https://github.com/fmtlib/fmt/pull/2904). Thanks @phprus.
Added support for ranges with begin / end found via the argument-dependent lookup (https://github.com/fmtlib/fmt/pull/2807). Thanks @rbrugo.
Fixed formatting of certain kinds of ranges of ranges (https://github.com/fmtlib/fmt/pull/2787). Thanks @BRevzin.
Fixed handling of maps with element types other than std::pair (https://github.com/fmtlib/fmt/pull/2944). Thanks @BrukerJWD.
Made tuple formatter enabled only if elements are formattable (https://github.com/fmtlib/fmt/issues/2939, https://github.com/fmtlib/fmt/pull/2940). Thanks @jehelset.
Made fmt::join compatible with format string compilation (https://github.com/fmtlib/fmt/issues/2719, https://github.com/fmtlib/fmt/pull/2720). Thanks @phprus.
Made compile-time checks work with named arguments of custom types and std::ostream print overloads (https://github.com/fmtlib/fmt/issues/2816, https://github.com/fmtlib/fmt/issues/2817, https://github.com/fmtlib/fmt/pull/2819). Thanks @timsong-cpp.
Removed make_args_checked because it is no longer needed for compile-time checks (https://github.com/fmtlib/fmt/pull/2760). Thanks @phprus.
Removed the following deprecated APIs: _format, arg_join, the format_to overload that takes a memory buffer, [v]fprintf that takes an ostream.
Removed the deprecated implicit conversion of [const] signed char* and [const] unsigned char* to C strings.
Removed the deprecated fmt/locale.h.
Replaced the deprecated fileno() with descriptor() in buffered_file.
Moved to_string_view to the detail namespace since it's an implementation detail.
Made access mode of a created file consistent with fopen by setting S_IWGRP and S_IWOTH (https://github.com/fmtlib/fmt/pull/2733). Thanks @arogge.
Removed a redundant buffer resize when formatting to std::ostream (https://github.com/fmtlib/fmt/issues/2842, https://github.com/fmtlib/fmt/pull/2843). Thanks @jcelerier.
Made precision computation for strings consistent with width (https://github.com/fmtlib/fmt/issues/2888).
Fixed handling of locale separators in floating point formatting (https://github.com/fmtlib/fmt/issues/2830).
Made sign specifiers work with __int128_t (https://github.com/fmtlib/fmt/issues/2773).
Improved support for systems such as CHERI with extra data stored in pointers (https://github.com/fmtlib/fmt/pull/2932). Thanks @davidchisnall.
Improved documentation (https://github.com/fmtlib/fmt/pull/2706, https://github.com/fmtlib/fmt/pull/2712, https://github.com/fmtlib/fmt/pull/2789, https://github.com/fmtlib/fmt/pull/2803, https://github.com/fmtlib/fmt/pull/2805, https://github.com/fmtlib/fmt/pull/2815, https://github.com/fmtlib/fmt/pull/2924). Thanks @BRevzin, @Pokechu22, @setoye, @rtobar, @rbrugo, @anoonD and @leha-bot.
Improved build configuration (https://github.com/fmtlib/fmt/pull/2766, https://github.com/fmtlib/fmt/pull/2772, https://github.com/fmtlib/fmt/pull/2836, https://github.com/fmtlib/fmt/pull/2852, https://github.com/fmtlib/fmt/pull/2907, https://github.com/fmtlib/fmt/pull/2913, https://github.com/fmtlib/fmt/pull/2914). Thanks @kambala-decapitator, @mattiasljungstrom, @kieselnb, @nathannaveen and @Vertexwahn.
Fixed various warnings and compilation issues (https://github.com/fmtlib/fmt/issues/2408, https://github.com/fmtlib/fmt/issues/2507, https://github.com/fmtlib/fmt/issues/2697, https://github.com/fmtlib/fmt/issues/2715, https://github.com/fmtlib/fmt/issues/2717, https://github.com/fmtlib/fmt/pull/2722, https://github.com/fmtlib/fmt/pull/2724, https://github.com/fmtlib/fmt/pull/2725, https://github.com/fmtlib/fmt/issues/2726, https://github.com/fmtlib/fmt/pull/2728, https://github.com/fmtlib/fmt/pull/2732, https://github.com/fmtlib/fmt/issues/2738, https://github.com/fmtlib/fmt/pull/2742, https://github.com/fmtlib/fmt/issues/2744, https://github.com/fmtlib/fmt/issues/2745, https://github.com/fmtlib/fmt/issues/2746, https://github.com/fmtlib/fmt/issues/2754, https://github.com/fmtlib/fmt/pull/2755, https://github.com/fmtlib/fmt/issues/2757, https://github.com/fmtlib/fmt/pull/2758, https://github.com/fmtlib/fmt/issues/2761, https://github.com/fmtlib/fmt/pull/2762, https://github.com/fmtlib/fmt/issues/2763, https://github.com/fmtlib/fmt/pull/2765, https://github.com/fmtlib/fmt/issues/2769, https://github.com/fmtlib/fmt/pull/2770, https://github.com/fmtlib/fmt/issues/2771, https://github.com/fmtlib/fmt/issues/2777, https://github.com/fmtlib/fmt/pull/2779, https://github.com/fmtlib/fmt/pull/2782, https://github.com/fmtlib/fmt/pull/2783, https://github.com/fmtlib/fmt/issues/2794, https://github.com/fmtlib/fmt/issues/2796, https://github.com/fmtlib/fmt/pull/2797, https://github.com/fmtlib/fmt/pull/2801, https://github.com/fmtlib/fmt/pull/2802, https://github.com/fmtlib/fmt/issues/2808, https://github.com/fmtlib/fmt/issues/2818, https://github.com/fmtlib/fmt/pull/2819, https://github.com/fmtlib/fmt/issues/2829, https://github.com/fmtlib/fmt/issues/2835, https://github.com/fmtlib/fmt/issues/2848, https://github.com/fmtlib/fmt/issues/2860, https://github.com/fmtlib/fmt/pull/2861, https://github.com/fmtlib/fmt/pull/2882, https://github.com/fmtlib/fmt/issues/2886, https://github.com/fmtlib/fmt/issues/2891, https://github.com/fmtlib/fmt/pull/2892, https://github.com/fmtlib/fmt/issues/2895, https://github.com/fmtlib/fmt/issues/2896, https://github.com/fmtlib/fmt/pull/2903, https://github.com/fmtlib/fmt/issues/2906, https://github.com/fmtlib/fmt/issues/2908, https://github.com/fmtlib/fmt/pull/2909, https://github.com/fmtlib/fmt/issues/2920, https://github.com/fmtlib/fmt/pull/2922, https://github.com/fmtlib/fmt/pull/2927, https://github.com/fmtlib/fmt/pull/2929, https://github.com/fmtlib/fmt/issues/2936, https://github.com/fmtlib/fmt/pull/2937, https://github.com/fmtlib/fmt/pull/2938, https://github.com/fmtlib/fmt/pull/2951, https://github.com/fmtlib/fmt/issues/2954, https://github.com/fmtlib/fmt/pull/2957, https://github.com/fmtlib/fmt/issues/2958, https://github.com/fmtlib/fmt/pull/2960). Thanks @matrackif @Tobi823, @ivan-volnov, @VasiliPupkin256, @federico-busato, @barcharcraz, @jk-jeon, @HazardyKnusperkeks, @dalboris, @seanm, @gsjaardema, @timsong-cpp, @seanm, @frithrah, @chronoxor, @Agga, @madmaxoft, @JurajX, @phprus and @Dani-Hub.

8.1.1 - 2022-01-06

Restored ABI compatibility with version 8.0.x (https://github.com/fmtlib/fmt/issues/2695, https://github.com/fmtlib/fmt/pull/2696). Thanks @saraedum.
Fixed chrono formatting on big endian systems (https://github.com/fmtlib/fmt/issues/2698, https://github.com/fmtlib/fmt/pull/2699). Thanks @phprus and @xvitaly.
Fixed a linkage error with mingw (https://github.com/fmtlib/fmt/issues/2691, https://github.com/fmtlib/fmt/pull/2692). Thanks @rbberger.

8.1.0 - 2022-01-02

Optimized chrono formatting (https://github.com/fmtlib/fmt/pull/2500, https://github.com/fmtlib/fmt/pull/2537, https://github.com/fmtlib/fmt/issues/2541, https://github.com/fmtlib/fmt/pull/2544, https://github.com/fmtlib/fmt/pull/2550, https://github.com/fmtlib/fmt/pull/2551, https://github.com/fmtlib/fmt/pull/2576, https://github.com/fmtlib/fmt/issues/2577, https://github.com/fmtlib/fmt/pull/2586, https://github.com/fmtlib/fmt/pull/2591, https://github.com/fmtlib/fmt/pull/2594, https://github.com/fmtlib/fmt/pull/2602, https://github.com/fmtlib/fmt/pull/2617, https://github.com/fmtlib/fmt/issues/2628, https://github.com/fmtlib/fmt/pull/2633, https://github.com/fmtlib/fmt/issues/2670, https://github.com/fmtlib/fmt/pull/2671).

Processing of some specifiers such as %z and %Y is now up to 10-20 times faster, for example on GCC 11 with libstdc++:
```
----------------------------------------------------------------------------
Benchmark                                  Before             After
----------------------------------------------------------------------------
FMTFormatter_z                             261 ns             26.3 ns
FMTFormatterCompile_z                      246 ns             11.6 ns
FMTFormatter_Y                             263 ns             26.1 ns
FMTFormatterCompile_Y                      244 ns             10.5 ns
----------------------------------------------------------------------------
```
Thanks @phprus and @toughengineer.
Implemented subsecond formatting for chrono durations (https://github.com/fmtlib/fmt/pull/2623). For example (godbolt):
```
#include <fmt/chrono.h>

int main() {
  fmt::print("{:%S}", std::chrono::milliseconds(1234));
}
```
prints "01.234".

Thanks @matrackif.
Fixed handling of precision 0 when formatting chrono durations (https://github.com/fmtlib/fmt/issues/2587, https://github.com/fmtlib/fmt/pull/2588). Thanks @lukester1975.
Fixed an overflow on invalid inputs in the tm formatter (https://github.com/fmtlib/fmt/pull/2564). Thanks @phprus.
Added fmt::group_digits that formats integers with a non-localized digit separator (comma) for groups of three digits. For example (godbolt):
```
#include <fmt/format.h>

int main() {
  fmt::print("{} dollars", fmt::group_digits(1000000));
}
```
prints "1,000,000 dollars".
Added support for faint, conceal, reverse and blink text styles (https://github.com/fmtlib/fmt/pull/2394):

https://user-images.githubusercontent.com/576385/147710227-c68f5317-f8fa-42c3-9123-7c4ba3c398cb.mp4

Thanks @benit8 and @data-man.
Added experimental support for compile-time floating point formatting (https://github.com/fmtlib/fmt/pull/2426, https://github.com/fmtlib/fmt/pull/2470). It is currently limited to the header-only mode. Thanks @alexezeder.
Added UDL-based named argument support to compile-time format string checks (https://github.com/fmtlib/fmt/issues/2640, https://github.com/fmtlib/fmt/pull/2649). For example (godbolt):
```
#include <fmt/format.h>

int main() {
  using namespace fmt::literals;
  fmt::print("{answer:s}", "answer"_a=42);
}
```
gives a compile-time error on compilers with C++20 consteval and non-type template parameter support (gcc 10+) because s is not a valid format specifier for an integer.

Thanks @alexezeder.

Implemented escaping of string range elements. For example (godbolt):

#include <fmt/ranges.h>
#include <vector>

int main() {
  fmt::print("{}", std::vector<std::string>{"\naan"});
}

is now printed as:

["\naan"]

instead of:

["
aan"]

Added an experimental ? specifier for escaping strings. (https://github.com/fmtlib/fmt/pull/2674). Thanks @BRevzin.

Switched to JSON-like representation of maps and sets for consistency with Python's str.format. For example (godbolt):

#include <fmt/ranges.h>
#include <map>

int main() {
  fmt::print("{}", std::map<std::string, int>{{"answer", 42}});
}

is now printed as:

{"answer": 42}

Extended fmt::join to support C++20-only ranges (https://github.com/fmtlib/fmt/pull/2549). Thanks @BRevzin.
Optimized handling of non-const-iterable ranges and implemented initial support for non-const-formattable types.
Disabled implicit conversions of scoped enums to integers that was accidentally introduced in earlier versions (https://github.com/fmtlib/fmt/pull/1841).
Deprecated implicit conversion of [const] signed char* and [const] unsigned char* to C strings.
Deprecated _format, a legacy UDL-based format API (https://github.com/fmtlib/fmt/pull/2646). Thanks @alexezeder.
Marked format, formatted_size and to_string as [[nodiscard]] (https://github.com/fmtlib/fmt/pull/2612). @0x8000-0000.
Added missing diagnostic when trying to format function and member pointers as well as objects convertible to pointers which is explicitly disallowed (https://github.com/fmtlib/fmt/issues/2598, https://github.com/fmtlib/fmt/pull/2609, https://github.com/fmtlib/fmt/pull/2610). Thanks @AlexGuteniev.
Optimized writing to a contiguous buffer with format_to_n (https://github.com/fmtlib/fmt/pull/2489). Thanks @Roman-Koshelev.
Optimized writing to non-char buffers (https://github.com/fmtlib/fmt/pull/2477). Thanks @Roman-Koshelev.
Decimal point is now localized when using the L specifier.
Improved floating point formatter implementation (https://github.com/fmtlib/fmt/pull/2498, https://github.com/fmtlib/fmt/pull/2499). Thanks @Roman-Koshelev.
Fixed handling of very large precision in fixed format (https://github.com/fmtlib/fmt/pull/2616).
Made a table of cached powers used in FP formatting static (https://github.com/fmtlib/fmt/pull/2509). Thanks @jk-jeon.
Resolved a lookup ambiguity with C++20 format-related functions due to ADL (https://github.com/fmtlib/fmt/issues/2639, https://github.com/fmtlib/fmt/pull/2641). Thanks @mkurdej.
Removed unnecessary inline namespace qualification (https://github.com/fmtlib/fmt/issues/2642, https://github.com/fmtlib/fmt/pull/2643). Thanks @mkurdej.
Implemented argument forwarding in format_to_n (https://github.com/fmtlib/fmt/issues/2462, https://github.com/fmtlib/fmt/pull/2463). Thanks @owent.
Fixed handling of implicit conversions in fmt::to_string and format string compilation (https://github.com/fmtlib/fmt/issues/2565).
Changed the default access mode of files created by fmt::output_file to -rw-r--r-- for consistency with fopen (https://github.com/fmtlib/fmt/issues/2530).
Make fmt::ostream::flush public (https://github.com/fmtlib/fmt/issues/2435).
Improved C++14/17 attribute detection (https://github.com/fmtlib/fmt/pull/2615). Thanks @AlexGuteniev.
Improved consteval detection for MSVC (https://github.com/fmtlib/fmt/pull/2559). Thanks @DanielaE.
Improved documentation (https://github.com/fmtlib/fmt/issues/2406, https://github.com/fmtlib/fmt/pull/2446, https://github.com/fmtlib/fmt/issues/2493, https://github.com/fmtlib/fmt/issues/2513, https://github.com/fmtlib/fmt/pull/2515, https://github.com/fmtlib/fmt/issues/2522, https://github.com/fmtlib/fmt/pull/2562, https://github.com/fmtlib/fmt/pull/2575, https://github.com/fmtlib/fmt/pull/2606, https://github.com/fmtlib/fmt/pull/2620, https://github.com/fmtlib/fmt/issues/2676). Thanks @sobolevn, @UnePierre, @zhsj, @phprus, @ericcurtin and @Lounarok.
Improved fuzzers and added a fuzzer for chrono timepoint formatting (https://github.com/fmtlib/fmt/pull/2461, https://github.com/fmtlib/fmt/pull/2469). @pauldreik,
Added the FMT_SYSTEM_HEADERS CMake option setting which marks {fmt}'s headers as system. It can be used to suppress warnings (https://github.com/fmtlib/fmt/issues/2644, https://github.com/fmtlib/fmt/pull/2651). Thanks @alexezeder.
Added the Bazel build system support (https://github.com/fmtlib/fmt/pull/2505, https://github.com/fmtlib/fmt/pull/2516). Thanks @Vertexwahn.
Improved build configuration and tests (https://github.com/fmtlib/fmt/issues/2437, https://github.com/fmtlib/fmt/pull/2558, https://github.com/fmtlib/fmt/pull/2648, https://github.com/fmtlib/fmt/pull/2650, https://github.com/fmtlib/fmt/pull/2663, https://github.com/fmtlib/fmt/pull/2677). Thanks @DanielaE, @alexezeder and @phprus.
Fixed various warnings and compilation issues (https://github.com/fmtlib/fmt/pull/2353, https://github.com/fmtlib/fmt/pull/2356, https://github.com/fmtlib/fmt/pull/2399, https://github.com/fmtlib/fmt/issues/2408, https://github.com/fmtlib/fmt/pull/2414, https://github.com/fmtlib/fmt/pull/2427, https://github.com/fmtlib/fmt/pull/2432, https://github.com/fmtlib/fmt/pull/2442, https://github.com/fmtlib/fmt/pull/2434, https://github.com/fmtlib/fmt/issues/2439, https://github.com/fmtlib/fmt/pull/2447, https://github.com/fmtlib/fmt/pull/2450, https://github.com/fmtlib/fmt/issues/2455, https://github.com/fmtlib/fmt/issues/2465, https://github.com/fmtlib/fmt/issues/2472, https://github.com/fmtlib/fmt/issues/2474, https://github.com/fmtlib/fmt/pull/2476, https://github.com/fmtlib/fmt/issues/2478, https://github.com/fmtlib/fmt/issues/2479, https://github.com/fmtlib/fmt/issues/2481, https://github.com/fmtlib/fmt/pull/2482, https://github.com/fmtlib/fmt/pull/2483, https://github.com/fmtlib/fmt/issues/2490, https://github.com/fmtlib/fmt/pull/2491, https://github.com/fmtlib/fmt/pull/2510, https://github.com/fmtlib/fmt/pull/2518, https://github.com/fmtlib/fmt/issues/2528, https://github.com/fmtlib/fmt/pull/2529, https://github.com/fmtlib/fmt/pull/2539, https://github.com/fmtlib/fmt/issues/2540, https://github.com/fmtlib/fmt/pull/2545, https://github.com/fmtlib/fmt/pull/2555, https://github.com/fmtlib/fmt/issues/2557, https://github.com/fmtlib/fmt/issues/2570, https://github.com/fmtlib/fmt/pull/2573, https://github.com/fmtlib/fmt/pull/2582, https://github.com/fmtlib/fmt/issues/2605, https://github.com/fmtlib/fmt/pull/2611, https://github.com/fmtlib/fmt/pull/2647, https://github.com/fmtlib/fmt/issues/2627, https://github.com/fmtlib/fmt/pull/2630, https://github.com/fmtlib/fmt/issues/2635, https://github.com/fmtlib/fmt/issues/2638, https://github.com/fmtlib/fmt/issues/2653, https://github.com/fmtlib/fmt/issues/2654, https://github.com/fmtlib/fmt/issues/2661, https://github.com/fmtlib/fmt/pull/2664, https://github.com/fmtlib/fmt/pull/2684). Thanks @DanielaE, @mwinterb, @cdacamar, @TrebledJ, @bodomartin, @cquammen, @white238, @mmarkeloff, @palacaze, @jcelerier, @mborn-adi, @BrukerJWD, @spyridon97, @phprus, @oliverlee, @joshessman-llnl, @akohlmey, @timkalu, @olupton, @Acretock, @alexezeder, @andrewcorrigan, @lucpelletier and @HazardyKnusperkeks.

8.0.1 - 2021-07-02

Fixed the version number in the inline namespace (https://github.com/fmtlib/fmt/issues/2374).
Added a missing presentation type check for std::string (https://github.com/fmtlib/fmt/issues/2402).
Fixed a linkage error when mixing code built with clang and gcc (https://github.com/fmtlib/fmt/issues/2377).
Fixed documentation issues (https://github.com/fmtlib/fmt/pull/2396, https://github.com/fmtlib/fmt/issues/2403, https://github.com/fmtlib/fmt/issues/2406). Thanks @mkurdej.
Removed dead code in FP formatter ( https://github.com/fmtlib/fmt/pull/2398). Thanks @javierhonduco.
Fixed various warnings and compilation issues (https://github.com/fmtlib/fmt/issues/2351, https://github.com/fmtlib/fmt/issues/2359, https://github.com/fmtlib/fmt/pull/2365, https://github.com/fmtlib/fmt/issues/2368, https://github.com/fmtlib/fmt/pull/2370, https://github.com/fmtlib/fmt/pull/2376, https://github.com/fmtlib/fmt/pull/2381, https://github.com/fmtlib/fmt/pull/2382, https://github.com/fmtlib/fmt/issues/2386, https://github.com/fmtlib/fmt/pull/2389, https://github.com/fmtlib/fmt/pull/2395, https://github.com/fmtlib/fmt/pull/2397, https://github.com/fmtlib/fmt/issues/2400, https://github.com/fmtlib/fmt/issues/2401, https://github.com/fmtlib/fmt/pull/2407). Thanks @zx2c4, @AidanSun05, @mattiasljungstrom, @joemmett, @erengy, @patlkli, @gsjaardema and @phprus.

8.0.0 - 2021-06-21

Enabled compile-time format string checks by default. For example (godbolt):
```
#include <fmt/core.h>

int main() {
  fmt::print("{:d}", "I am not a number");
}
```
gives a compile-time error on compilers with C++20 consteval support (gcc 10+, clang 11+) because d is not a valid format specifier for a string.

To pass a runtime string wrap it in fmt::runtime:
```
fmt::print(fmt::runtime("{:d}"), "I am not a number");
```
Added compile-time formatting (https://github.com/fmtlib/fmt/pull/2019, https://github.com/fmtlib/fmt/pull/2044, https://github.com/fmtlib/fmt/pull/2056, https://github.com/fmtlib/fmt/pull/2072, https://github.com/fmtlib/fmt/pull/2075, https://github.com/fmtlib/fmt/issues/2078, https://github.com/fmtlib/fmt/pull/2129, https://github.com/fmtlib/fmt/pull/2326). For example (godbolt):
```
#include <fmt/compile.h>

consteval auto compile_time_itoa(int value) -> std::array<char, 10> {
  auto result = std::array<char, 10>();
  fmt::format_to(result.data(), FMT_COMPILE("{}"), value);
  return result;
}

constexpr auto answer = compile_time_itoa(42);
```
Most of the formatting functionality is available at compile time with a notable exception of floating-point numbers and pointers. Thanks @alexezeder.

Optimized handling of format specifiers during format string compilation. For example, hexadecimal formatting ("{:x}") is now 3-7x faster than before when using format_to with format string compilation and a stack-allocated buffer (https://github.com/fmtlib/fmt/issues/1944).

Before (7.1.3):

----------------------------------------------------------------------------
Benchmark                                  Time             CPU   Iterations
----------------------------------------------------------------------------
FMTCompileOld/0                         15.5 ns         15.5 ns     43302898
FMTCompileOld/42                        16.6 ns         16.6 ns     43278267
FMTCompileOld/273123                    18.7 ns         18.6 ns     37035861
FMTCompileOld/9223372036854775807       19.4 ns         19.4 ns     35243000
----------------------------------------------------------------------------

After (8.x):

----------------------------------------------------------------------------
Benchmark                                  Time             CPU   Iterations
----------------------------------------------------------------------------
FMTCompileNew/0                         1.99 ns         1.99 ns    360523686
FMTCompileNew/42                        2.33 ns         2.33 ns    279865664
FMTCompileNew/273123                    3.72 ns         3.71 ns    190230315
FMTCompileNew/9223372036854775807       5.28 ns         5.26 ns    130711631
----------------------------------------------------------------------------

It is even faster than std::to_chars from libc++ compiled with clang on macOS:

----------------------------------------------------------------------------
Benchmark                                  Time             CPU   Iterations
----------------------------------------------------------------------------
ToChars/0                               4.42 ns         4.41 ns    160196630
ToChars/42                              5.00 ns         4.98 ns    140735201
ToChars/273123                          7.26 ns         7.24 ns     95784130
ToChars/9223372036854775807             8.77 ns         8.75 ns     75872534
----------------------------------------------------------------------------

In other cases, especially involving std::string construction, the speed up is usually lower because handling format specifiers takes a smaller fraction of the total time.

Added the _cf user-defined literal to represent a compiled format string. It can be used instead of the FMT_COMPILE macro (https://github.com/fmtlib/fmt/pull/2043, https://github.com/fmtlib/fmt/pull/2242):
```
#include <fmt/compile.h>

using namespace fmt::literals;
auto s = fmt::format(FMT_COMPILE("{}"), 42); // 🙁 not modern
auto s = fmt::format("{}"_cf, 42);           // 🙂 modern as hell
```
It requires compiler support for class types in non-type template parameters (a C++20 feature) which is available in GCC 9.3+. Thanks @alexezeder.

Format string compilation now requires format functions of formatter specializations for user-defined types to be const:

template <> struct fmt::formatter<my_type>: formatter<string_view> {
  template <typename FormatContext>
  auto format(my_type obj, FormatContext& ctx) const {  // Note const here.
    // ...
  }
};

Added UDL-based named argument support to format string compilation (https://github.com/fmtlib/fmt/pull/2243, https://github.com/fmtlib/fmt/pull/2281). For example:
```
#include <fmt/compile.h>

using namespace fmt::literals;
auto s = fmt::format(FMT_COMPILE("{answer}"), "answer"_a = 42);
```
Here the argument named "answer" is resolved at compile time with no runtime overhead. Thanks @alexezeder.
Added format string compilation support to fmt::print (https://github.com/fmtlib/fmt/issues/2280, https://github.com/fmtlib/fmt/pull/2304). Thanks @alexezeder.
Added initial support for compiling {fmt} as a C++20 module (https://github.com/fmtlib/fmt/pull/2235, https://github.com/fmtlib/fmt/pull/2240, https://github.com/fmtlib/fmt/pull/2260, https://github.com/fmtlib/fmt/pull/2282, https://github.com/fmtlib/fmt/pull/2283, https://github.com/fmtlib/fmt/pull/2288, https://github.com/fmtlib/fmt/pull/2298, https://github.com/fmtlib/fmt/pull/2306, https://github.com/fmtlib/fmt/pull/2307, https://github.com/fmtlib/fmt/pull/2309, https://github.com/fmtlib/fmt/pull/2318, https://github.com/fmtlib/fmt/pull/2324, https://github.com/fmtlib/fmt/pull/2332, https://github.com/fmtlib/fmt/pull/2340). Thanks @DanielaE.
Made symbols private by default reducing shared library size (https://github.com/fmtlib/fmt/pull/2301). For example there was a ~15% reported reduction on one platform. Thanks @sergiud.
Optimized includes making the result of preprocessing fmt/format.h ~20% smaller with libstdc++/C++20 and slightly improving build times (https://github.com/fmtlib/fmt/issues/1998).
Added support of ranges with non-const begin / end (https://github.com/fmtlib/fmt/pull/1953). Thanks @kitegi.
Added support of std::byte and other formattable types to fmt::join (https://github.com/fmtlib/fmt/issues/1981, https://github.com/fmtlib/fmt/issues/2040, https://github.com/fmtlib/fmt/pull/2050, https://github.com/fmtlib/fmt/issues/2262). For example:
```
#include <fmt/format.h>
#include <cstddef>
#include <vector>

int main() {
  auto bytes = std::vector{std::byte(4), std::byte(2)};
  fmt::print("{}", fmt::join(bytes, ""));
}
```
prints "42".

Thanks @kamibo.
Implemented the default format for std::chrono::system_clock (https://github.com/fmtlib/fmt/issues/2319, https://github.com/fmtlib/fmt/pull/2345). For example:
```
#include <fmt/chrono.h>

int main() {
  fmt::print("{}", std::chrono::system_clock::now());
}
```
prints "2021-06-18 15:22:00" (the output depends on the current date and time). Thanks @sunmy2019.

Made more chrono specifiers locale independent by default. Use the 'L' specifier to get localized formatting. For example:

#include <fmt/chrono.h>

int main() {
  std::locale::global(std::locale("ru_RU.UTF-8"));
  auto monday = std::chrono::weekday(1);
  fmt::print("{}\n", monday);   // prints "Mon"
  fmt::print("{:L}\n", monday); // prints "пн"
}

Improved locale handling in chrono formatting (https://github.com/fmtlib/fmt/issues/2337, https://github.com/fmtlib/fmt/pull/2349, https://github.com/fmtlib/fmt/pull/2350). Thanks @phprus.
Deprecated fmt/locale.h moving the formatting functions that take a locale to fmt/format.h (char) and fmt/xchar (other overloads). This doesn't introduce a dependency on <locale> so there is virtually no compile time effect.
Deprecated an undocumented format_to overload that takes basic_memory_buffer.
Made parameter order in vformat_to consistent with format_to (https://github.com/fmtlib/fmt/issues/2327).

Added support for time points with arbitrary durations (https://github.com/fmtlib/fmt/issues/2208). For example:

#include <fmt/chrono.h>

int main() {
  using tp = std::chrono::time_point<
    std::chrono::system_clock, std::chrono::seconds>;
  fmt::print("{:%S}", tp(std::chrono::seconds(42)));
}

prints "42".

Formatting floating-point numbers no longer produces trailing zeros by default for consistency with std::format. For example:
```
#include <fmt/core.h>

int main() {
  fmt::print("{0:.3}", 1.1);
}
```
prints "1.1". Use the '#' specifier to keep trailing zeros.
Dropped a limit on the number of elements in a range and replaced {} with [] as range delimiters for consistency with Python's str.format.
The 'L' specifier for locale-specific numeric formatting can now be combined with presentation specifiers as in std::format. For example:
```
#include <fmt/core.h>
#include <locale>

int main() {
  std::locale::global(std::locale("fr_FR.UTF-8"));
  fmt::print("{0:.2Lf}", 0.42);
}
```
prints "0,42". The deprecated 'n' specifier has been removed.
Made the 0 specifier ignored for infinity and NaN (https://github.com/fmtlib/fmt/issues/2305, https://github.com/fmtlib/fmt/pull/2310). Thanks @Liedtke.
Made the hexfloat formatting use the right alignment by default (https://github.com/fmtlib/fmt/issues/2308, https://github.com/fmtlib/fmt/pull/2317). Thanks @Liedtke.
Removed the deprecated numeric alignment ('='). Use the '0' specifier instead.
Removed the deprecated fmt/posix.h header that has been replaced with fmt/os.h.
Removed the deprecated format_to_n_context, format_to_n_args and make_format_to_n_args. They have been replaced with format_context, format_args` andmake_format_args`` respectively.
Moved wchar_t-specific functions and types to fmt/xchar.h. You can define FMT_DEPRECATED_INCLUDE_XCHAR to automatically include fmt/xchar.h from fmt/format.h but this will be disabled in the next major release.
Fixed handling of the '+' specifier in localized formatting (https://github.com/fmtlib/fmt/issues/2133).
Added support for the 's' format specifier that gives textual representation of bool (https://github.com/fmtlib/fmt/issues/2094, https://github.com/fmtlib/fmt/pull/2109). For example:
```
#include <fmt/core.h>

int main() {
  fmt::print("{:s}", true);
}
```
prints "true". Thanks @powercoderlol.
Made fmt::ptr work with function pointers (https://github.com/fmtlib/fmt/pull/2131). For example:
```
#include <fmt/format.h>

int main() {
  fmt::print("My main: {}\n", fmt::ptr(main));
}
```
Thanks @mikecrowe.
The undocumented support for specializing formatter for pointer types has been removed.
Fixed fmt::formatted_size with format string compilation (https://github.com/fmtlib/fmt/pull/2141, https://github.com/fmtlib/fmt/pull/2161). Thanks @alexezeder.
Fixed handling of empty format strings during format string compilation (https://github.com/fmtlib/fmt/issues/2042):
```
auto s = fmt::format(FMT_COMPILE(""));
```
Thanks @alexezeder.
Fixed handling of enums in fmt::to_string (https://github.com/fmtlib/fmt/issues/2036).
Improved width computation (https://github.com/fmtlib/fmt/issues/2033, https://github.com/fmtlib/fmt/issues/2091). For example:
```
#include <fmt/core.h>

int main() {
  fmt::print("{:-<10}{}\n", "你好", "世界");
  fmt::print("{:-<10}{}\n", "hello", "world");
}
```
prints

on a modern terminal.
The experimental fast output stream (fmt::ostream) is now truncated by default for consistency with fopen (https://github.com/fmtlib/fmt/issues/2018). For example:
```
#include <fmt/os.h>

int main() {
  fmt::ostream out1 = fmt::output_file("guide");
  out1.print("Zaphod");
  out1.close();
  fmt::ostream out2 = fmt::output_file("guide");
  out2.print("Ford");
}
```
writes "Ford" to the file "guide". To preserve the old file content if any pass fmt::file::WRONLY | fmt::file::CREATE flags to fmt::output_file.
Fixed moving of fmt::ostream that holds buffered data (https://github.com/fmtlib/fmt/issues/2197, https://github.com/fmtlib/fmt/pull/2198). Thanks @vtta.
Replaced the fmt::system_error exception with a function of the same name that constructs std::system_error (https://github.com/fmtlib/fmt/issues/2266).
Replaced the fmt::windows_error exception with a function of the same name that constructs std::system_error with the category returned by fmt::system_category() (https://github.com/fmtlib/fmt/issues/2274, https://github.com/fmtlib/fmt/pull/2275). The latter is similar to std::system_category but correctly handles UTF-8. Thanks @phprus.
Replaced fmt::error_code with std::error_code and made it formattable (https://github.com/fmtlib/fmt/issues/2269, https://github.com/fmtlib/fmt/pull/2270, https://github.com/fmtlib/fmt/pull/2273). Thanks @phprus.
Added speech synthesis support (https://github.com/fmtlib/fmt/pull/2206).
Made format_to work with a memory buffer that has a custom allocator (https://github.com/fmtlib/fmt/pull/2300). Thanks @voxmea.
Added Allocator::max_size support to basic_memory_buffer. (https://github.com/fmtlib/fmt/pull/1960). Thanks @phprus.
Added wide string support to fmt::join (https://github.com/fmtlib/fmt/pull/2236). Thanks @crbrz.
Made iterators passed to formatter specializations via a format context satisfy C++20 std::output_iterator requirements (https://github.com/fmtlib/fmt/issues/2156, https://github.com/fmtlib/fmt/pull/2158, https://github.com/fmtlib/fmt/issues/2195, https://github.com/fmtlib/fmt/pull/2204). Thanks @randomnetcat.
Optimized the printf implementation (https://github.com/fmtlib/fmt/pull/1982, https://github.com/fmtlib/fmt/pull/1984, https://github.com/fmtlib/fmt/pull/2016, https://github.com/fmtlib/fmt/pull/2164). Thanks @rimathia and @moiwi.
Improved detection of constexpr char_traits (https://github.com/fmtlib/fmt/pull/2246, https://github.com/fmtlib/fmt/pull/2257). Thanks @phprus.
Fixed writing to stdout when it is redirected to NUL on Windows (https://github.com/fmtlib/fmt/issues/2080).
Fixed exception propagation from iterators (https://github.com/fmtlib/fmt/issues/2097).
Improved strftime error handling (https://github.com/fmtlib/fmt/issues/2238, https://github.com/fmtlib/fmt/pull/2244). Thanks @yumeyao.
Stopped using deprecated GCC UDL template extension.
Added fmt/args.h to the install target (https://github.com/fmtlib/fmt/issues/2096).
Error messages are now passed to assert when exceptions are disabled (https://github.com/fmtlib/fmt/pull/2145). Thanks @NobodyXu.
Added the FMT_MASTER_PROJECT CMake option to control build and install targets when {fmt} is included via add_subdirectory (https://github.com/fmtlib/fmt/issues/2098, https://github.com/fmtlib/fmt/pull/2100). Thanks @randomizedthinking.
Improved build configuration (https://github.com/fmtlib/fmt/pull/2026, https://github.com/fmtlib/fmt/pull/2122). Thanks @luncliff and @ibaned.
Fixed various warnings and compilation issues (https://github.com/fmtlib/fmt/issues/1947, https://github.com/fmtlib/fmt/pull/1959, https://github.com/fmtlib/fmt/pull/1963, https://github.com/fmtlib/fmt/pull/1965, https://github.com/fmtlib/fmt/issues/1966, https://github.com/fmtlib/fmt/pull/1974, https://github.com/fmtlib/fmt/pull/1975, https://github.com/fmtlib/fmt/pull/1990, https://github.com/fmtlib/fmt/issues/2000, https://github.com/fmtlib/fmt/pull/2001, https://github.com/fmtlib/fmt/issues/2002, https://github.com/fmtlib/fmt/issues/2004, https://github.com/fmtlib/fmt/pull/2006, https://github.com/fmtlib/fmt/pull/2009, https://github.com/fmtlib/fmt/pull/2010, https://github.com/fmtlib/fmt/issues/2038, https://github.com/fmtlib/fmt/issues/2039, https://github.com/fmtlib/fmt/issues/2047, https://github.com/fmtlib/fmt/pull/2053, https://github.com/fmtlib/fmt/issues/2059, https://github.com/fmtlib/fmt/pull/2065, https://github.com/fmtlib/fmt/pull/2067, https://github.com/fmtlib/fmt/pull/2068, https://github.com/fmtlib/fmt/pull/2073, https://github.com/fmtlib/fmt/issues/2103, https://github.com/fmtlib/fmt/issues/2105, https://github.com/fmtlib/fmt/pull/2106, https://github.com/fmtlib/fmt/pull/2107, https://github.com/fmtlib/fmt/issues/2116, https://github.com/fmtlib/fmt/pull/2117, https://github.com/fmtlib/fmt/issues/2118, https://github.com/fmtlib/fmt/pull/2119, https://github.com/fmtlib/fmt/issues/2127, https://github.com/fmtlib/fmt/pull/2128, https://github.com/fmtlib/fmt/issues/2140, https://github.com/fmtlib/fmt/issues/2142, https://github.com/fmtlib/fmt/pull/2143, https://github.com/fmtlib/fmt/pull/2144, https://github.com/fmtlib/fmt/issues/2147, https://github.com/fmtlib/fmt/issues/2148, https://github.com/fmtlib/fmt/issues/2149, https://github.com/fmtlib/fmt/pull/2152, https://github.com/fmtlib/fmt/pull/2160, https://github.com/fmtlib/fmt/issues/2170, https://github.com/fmtlib/fmt/issues/2175, https://github.com/fmtlib/fmt/issues/2176, https://github.com/fmtlib/fmt/pull/2177, https://github.com/fmtlib/fmt/issues/2178, https://github.com/fmtlib/fmt/pull/2179, https://github.com/fmtlib/fmt/issues/2180, https://github.com/fmtlib/fmt/issues/2181, https://github.com/fmtlib/fmt/pull/2183, https://github.com/fmtlib/fmt/issues/2184, https://github.com/fmtlib/fmt/issues/2185, https://github.com/fmtlib/fmt/pull/2186, https://github.com/fmtlib/fmt/pull/2187, https://github.com/fmtlib/fmt/pull/2190, https://github.com/fmtlib/fmt/pull/2192, https://github.com/fmtlib/fmt/pull/2194, https://github.com/fmtlib/fmt/pull/2205, https://github.com/fmtlib/fmt/issues/2210, https://github.com/fmtlib/fmt/pull/2211, https://github.com/fmtlib/fmt/pull/2215, https://github.com/fmtlib/fmt/pull/2216, https://github.com/fmtlib/fmt/pull/2218, https://github.com/fmtlib/fmt/pull/2220, https://github.com/fmtlib/fmt/issues/2228, https://github.com/fmtlib/fmt/pull/2229, https://github.com/fmtlib/fmt/pull/2230, https://github.com/fmtlib/fmt/issues/2233, https://github.com/fmtlib/fmt/pull/2239, https://github.com/fmtlib/fmt/issues/2248, https://github.com/fmtlib/fmt/issues/2252, https://github.com/fmtlib/fmt/pull/2253, https://github.com/fmtlib/fmt/pull/2255, https://github.com/fmtlib/fmt/issues/2261, https://github.com/fmtlib/fmt/issues/2278, https://github.com/fmtlib/fmt/issues/2284, https://github.com/fmtlib/fmt/pull/2287, https://github.com/fmtlib/fmt/pull/2289, https://github.com/fmtlib/fmt/pull/2290, https://github.com/fmtlib/fmt/pull/2293, https://github.com/fmtlib/fmt/issues/2295, https://github.com/fmtlib/fmt/pull/2296, https://github.com/fmtlib/fmt/pull/2297, https://github.com/fmtlib/fmt/issues/2311, https://github.com/fmtlib/fmt/pull/2313, https://github.com/fmtlib/fmt/pull/2315, https://github.com/fmtlib/fmt/issues/2320, https://github.com/fmtlib/fmt/pull/2321, https://github.com/fmtlib/fmt/pull/2323, https://github.com/fmtlib/fmt/issues/2328, https://github.com/fmtlib/fmt/pull/2329, https://github.com/fmtlib/fmt/pull/2333, https://github.com/fmtlib/fmt/pull/2338, https://github.com/fmtlib/fmt/pull/2341). Thanks @darklukee, @fagg, @killerbot242, @jgopel, @yeswalrus, @Finkman, @HazardyKnusperkeks, @dkavolis, @concatime, @chronoxor, @summivox, @yNeo, @Apache-HB, @alexezeder, @toojays, @Brainy0207, @vadz, @imsherlock, @phprus, @white238, @yafshar, @BillyDonahue, @jstaahl, @denchat, @DanielaE, @ilyakurdyukov, @ilmai, @JessyDL, @sergiud, @mwinterb, @sven-herrmann, @jmelas, @twoixter, @crbrz and @upsj.
Improved documentation (https://github.com/fmtlib/fmt/issues/1986, https://github.com/fmtlib/fmt/pull/2051, https://github.com/fmtlib/fmt/issues/2057, https://github.com/fmtlib/fmt/pull/2081, https://github.com/fmtlib/fmt/issues/2084, https://github.com/fmtlib/fmt/pull/2312). Thanks @imba-tjd, @0x416c69 and @mordante.
Continuous integration and test improvements (https://github.com/fmtlib/fmt/issues/1969, https://github.com/fmtlib/fmt/pull/1991, https://github.com/fmtlib/fmt/pull/2020, https://github.com/fmtlib/fmt/pull/2110, https://github.com/fmtlib/fmt/pull/2114, https://github.com/fmtlib/fmt/issues/2196, https://github.com/fmtlib/fmt/pull/2217, https://github.com/fmtlib/fmt/pull/2247, https://github.com/fmtlib/fmt/pull/2256, https://github.com/fmtlib/fmt/pull/2336, https://github.com/fmtlib/fmt/pull/2346). Thanks @jgopel, @alexezeder and @DanielaE.

The change log for versions 0.8.0 - 7.1.3 is available here.

87 KiB Raw Blame History Unescape Escape

11.0.0 - TBD

10.2.1 - 2024-01-04

10.2.0 - 2024-01-01

10.1.1 - 2023-08-28

10.1.0 - 2023-08-12

10.0.0 - 2023-05-09

9.1.0 - 2022-08-27

9.0.0 - 2022-07-04

8.1.1 - 2022-01-06

8.1.0 - 2022-01-02

8.0.1 - 2021-07-02

8.0.0 - 2021-06-21

87 KiB

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