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Exclude fallback from is_formattable

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This commit is contained in:
Victor Zverovich 2021-05-05 06:29:51 -07:00
parent 400b953fbb
commit 4f0eadfce4
2 changed files with 16 additions and 15 deletions
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20
include/fmt/core.h
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@ -949,9 +949,9 @@ struct fallback_formatter {
};
// Specifies if T has an enabled fallback_formatter specialization.
template <typename T, typename Context>
template <typename T, typename Char>
using has_fallback_formatter =
std::is_constructible<fallback_formatter<T, typename Context::char_type>>;
std::is_constructible<fallback_formatter<T, Char>>;
struct view {};
@ -1224,7 +1224,7 @@ template <typename Context> struct arg_mapper {
FMT_ENABLE_IF(
std::is_constructible<basic_string_view<char_type>, T>::value &&
!is_string<T>::value && !has_formatter<T, Context>::value &&
!has_fallback_formatter<T, Context>::value)>
!has_fallback_formatter<T, char_type>::value)>
FMT_CONSTEXPR FMT_INLINE basic_string_view<char_type> map(const T& val) {
return basic_string_view<char_type>(val);
}
@ -1234,7 +1234,7 @@ template <typename Context> struct arg_mapper {
std::is_constructible<std_string_view<char_type>, T>::value &&
!std::is_constructible<basic_string_view<char_type>, T>::value &&
!is_string<T>::value && !has_formatter<T, Context>::value &&
!has_fallback_formatter<T, Context>::value)>
!has_fallback_formatter<T, char_type>::value)>
FMT_CONSTEXPR FMT_INLINE basic_string_view<char_type> map(const T& val) {
return std_string_view<char_type>(val);
}
@ -1279,7 +1279,7 @@ template <typename Context> struct arg_mapper {
template <typename T,
FMT_ENABLE_IF(std::is_enum<T>::value &&
!has_formatter<T, Context>::value &&
!has_fallback_formatter<T, Context>::value)>
!has_fallback_formatter<T, char_type>::value)>
FMT_CONSTEXPR FMT_INLINE auto map(const T& val)
-> decltype(std::declval<arg_mapper>().map(
static_cast<typename std::underlying_type<T>::type>(val))) {
@ -1288,7 +1288,7 @@ template <typename Context> struct arg_mapper {
template <typename T,
FMT_ENABLE_IF(!is_string<T>::value && !is_char<T>::value &&
(has_formatter<T, Context>::value ||
has_fallback_formatter<T, Context>::value))>
has_fallback_formatter<T, char_type>::value))>
FMT_CONSTEXPR FMT_INLINE const T& map(const T& val) {
return val;
}
@ -1578,9 +1578,11 @@ FMT_MODULE_EXPORT_END
FMT_MODULE_EXPORT_BEGIN
template <typename T, typename Char = char>
using is_formattable = bool_constant<!std::is_same<
decltype(detail::arg_mapper<buffer_context<Char>>().map(std::declval<T>())),
detail::unformattable>::value>;
using is_formattable = bool_constant<
!std::is_same<decltype(detail::arg_mapper<buffer_context<Char>>().map(
std::declval<T>())),
detail::unformattable>::value &&
!detail::has_fallback_formatter<T, Char>::value>;
/**
\rst

9
include/fmt/ranges.h
View File

@ -331,13 +331,12 @@ template <typename T, typename Char> struct is_range {
template <typename T, typename Char>
struct formatter<
T, Char,
enable_if_t<fmt::is_range<T, Char>::value
enable_if_t<
fmt::is_range<T, Char>::value
// Workaround a bug in MSVC 2017 and earlier.
#if !FMT_MSC_VER || FMT_MSC_VER >= 1927
&&
(has_formatter<detail::value_type<T>, format_context>::value ||
detail::has_fallback_formatter<detail::value_type<T>,
format_context>::value)
&& (has_formatter<detail::value_type<T>, format_context>::value ||
detail::has_fallback_formatter<detail::value_type<T>, Char>::value)
#endif
>> {
formatting_range<Char> formatting;