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Improve xchar support for std::bitset formatter

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Signed-off-by: Vladislav Shchapov <vladislav@shchapov.ru>
This commit is contained in:
Vladislav Shchapov
2025-01-02 22:51:25 +05:00
committed by Victor Zverovich
parent e3ddede6c4
commit 880e1494dc
2 changed files with 10 additions and 2 deletions
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5
include/fmt/std.h
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@ -184,7 +184,8 @@ FMT_END_NAMESPACE
FMT_BEGIN_NAMESPACE FMT_BEGIN_NAMESPACE
FMT_EXPORT FMT_EXPORT
template <std::size_t N, typename Char> template <std::size_t N, typename Char>
struct formatter<std::bitset<N>, Char> : nested_formatter<string_view> { struct formatter<std::bitset<N>, Char>
: nested_formatter<basic_string_view<Char>, Char> {
private: private:
// Functor because C++11 doesn't support generic lambdas. // Functor because C++11 doesn't support generic lambdas.
struct writer { struct writer {
@ -204,7 +205,7 @@ struct formatter<std::bitset<N>, Char> : nested_formatter<string_view> {
template <typename FormatContext> template <typename FormatContext>
auto format(const std::bitset<N>& bs, FormatContext& ctx) const auto format(const std::bitset<N>& bs, FormatContext& ctx) const
-> decltype(ctx.out()) { -> decltype(ctx.out()) {
return write_padded(ctx, writer{bs}); return this->write_padded(ctx, writer{bs});
} }
}; };

7
test/xchar-test.cc
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@ -491,6 +491,13 @@ TEST(locale_test, sign) {
EXPECT_EQ(fmt::format(std::locale(), L"{:L}", -50), L"-50"); EXPECT_EQ(fmt::format(std::locale(), L"{:L}", -50), L"-50");
} }
TEST(std_test_xchar, format_bitset) {
auto bs = std::bitset<6>(42);
EXPECT_EQ(fmt::format(L"{}", bs), L"101010");
EXPECT_EQ(fmt::format(L"{:0>8}", bs), L"00101010");
EXPECT_EQ(fmt::format(L"{:-^12}", bs), L"---101010---");
}
TEST(std_test_xchar, complex) { TEST(std_test_xchar, complex) {
auto s = fmt::format(L"{}", std::complex<double>(1, 2)); auto s = fmt::format(L"{}", std::complex<double>(1, 2));
EXPECT_EQ(s, L"(1+2i)"); EXPECT_EQ(s, L"(1+2i)");