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Victor Zverovich 2020-01-19 19:20:48 -08:00
parent 47d3968092
commit a844d7ab81
1 changed files with 16 additions and 16 deletions
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32
doc/syntax.rst
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@ -320,56 +320,56 @@ following examples.
Accessing arguments by position::
format("{0}, {1}, {2}", 'a', 'b', 'c');
fmt::format("{0}, {1}, {2}", 'a', 'b', 'c');
// Result: "a, b, c"
format("{}, {}, {}", 'a', 'b', 'c');
fmt::format("{}, {}, {}", 'a', 'b', 'c');
// Result: "a, b, c"
format("{2}, {1}, {0}", 'a', 'b', 'c');
fmt::format("{2}, {1}, {0}", 'a', 'b', 'c');
// Result: "c, b, a"
format("{0}{1}{0}", "abra", "cad"); // arguments' indices can be repeated
fmt::format("{0}{1}{0}", "abra", "cad"); // arguments' indices can be repeated
// Result: "abracadabra"
Aligning the text and specifying a width::
format("{:<30}", "left aligned");
fmt::format("{:<30}", "left aligned");
// Result: "left aligned "
format("{:>30}", "right aligned");
fmt::format("{:>30}", "right aligned");
// Result: " right aligned"
format("{:^30}", "centered");
fmt::format("{:^30}", "centered");
// Result: " centered "
format("{:*^30}", "centered"); // use '*' as a fill char
fmt::format("{:*^30}", "centered"); // use '*' as a fill char
// Result: "***********centered***********"
Dynamic width::
format("{:<{}}", "left aligned", 30);
fmt::format("{:<{}}", "left aligned", 30);
// Result: "left aligned "
Dynamic precision::
format("{:.{}f}", 3.14, 1);
fmt::format("{:.{}f}", 3.14, 1);
// Result: "3.1"
Replacing ``%+f``, ``%-f``, and ``% f`` and specifying a sign::
format("{:+f}; {:+f}", 3.14, -3.14); // show it always
fmt::format("{:+f}; {:+f}", 3.14, -3.14); // show it always
// Result: "+3.140000; -3.140000"
format("{: f}; {: f}", 3.14, -3.14); // show a space for positive numbers
fmt::format("{: f}; {: f}", 3.14, -3.14); // show a space for positive numbers
// Result: " 3.140000; -3.140000"
format("{:-f}; {:-f}", 3.14, -3.14); // show only the minus -- same as '{:f}; {:f}'
fmt::format("{:-f}; {:-f}", 3.14, -3.14); // show only the minus -- same as '{:f}; {:f}'
// Result: "3.140000; -3.140000"
Replacing ``%x`` and ``%o`` and converting the value to different bases::
format("int: {0:d}; hex: {0:x}; oct: {0:o}; bin: {0:b}", 42);
fmt::format("int: {0:d}; hex: {0:x}; oct: {0:o}; bin: {0:b}", 42);
// Result: "int: 42; hex: 2a; oct: 52; bin: 101010"
// with 0x or 0 or 0b as prefix:
format("int: {0:d}; hex: {0:#x}; oct: {0:#o}; bin: {0:#b}", 42);
fmt::format("int: {0:d}; hex: {0:#x}; oct: {0:#o}; bin: {0:#b}", 42);
// Result: "int: 42; hex: 0x2a; oct: 052; bin: 0b101010"
Padded hex byte with prefix and always prints both hex characters::
format("{:#04x}", 0);
fmt::format("{:#04x}", 0);
// Result: "0x00"
Box drawing using Unicode fill::