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Support fmt::runtime with wchar_t in fmt::format_to_n (#4715)

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sunmy2019 2026-03-22 08:10:17 +08:00 committed by GitHub
parent 4968433a6a
commit ea85b81ccd
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2 changed files with 30 additions and 2 deletions
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12
include/fmt/xchar.h
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@ -279,10 +279,18 @@ inline auto vformat_to_n(OutputIt out, size_t n, basic_string_view<Char> fmt,
return {buf.out(), buf.count()};
}
template <typename OutputIt, typename... T,
FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, wchar_t>::value)>
FMT_INLINE auto format_to_n(OutputIt out, size_t n, wformat_string<T...> fmt,
T&&... args) -> format_to_n_result<OutputIt> {
return vformat_to_n(out, n, fmt.get(), fmt::make_wformat_args(args...));
}
template <typename OutputIt, typename S, typename... T,
typename Char = detail::format_string_char_t<S>,
FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, Char>::value&&
detail::is_exotic_char<Char>::value)>
FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, Char>::value &&
!std::is_same<Char, char>::value &&
!std::is_same<Char, wchar_t>::value)>
inline auto format_to_n(OutputIt out, size_t n, const S& fmt, T&&... args)
-> format_to_n_result<OutputIt> {
return vformat_to_n(out, n, fmt::basic_string_view<Char>(fmt),

20
test/xchar-test.cc
View File

@ -146,6 +146,26 @@ TEST(format_test, wide_format_to_n) {
EXPECT_EQ(L"BC x", fmt::wstring_view(buffer, 4));
}
TEST(format_test, wide_format_to_n_runtime) {
wchar_t buffer[4];
buffer[3] = L'x';
auto result = fmt::format_to_n(buffer, 3, fmt::runtime(L"{}"), 12345);
EXPECT_EQ(5u, result.size);
EXPECT_EQ(buffer + 3, result.out);
EXPECT_EQ(L"123x", fmt::wstring_view(buffer, 4));
buffer[0] = L'x';
buffer[1] = L'x';
buffer[2] = L'x';
result = fmt::format_to_n(buffer, 3, fmt::runtime(L"{}"), L'A');
EXPECT_EQ(1u, result.size);
EXPECT_EQ(buffer + 1, result.out);
EXPECT_EQ(L"Axxx", fmt::wstring_view(buffer, 4));
result = fmt::format_to_n(buffer, 3, fmt::runtime(L"{}{} "), L'B', L'C');
EXPECT_EQ(3u, result.size);
EXPECT_EQ(buffer + 3, result.out);
EXPECT_EQ(L"BC x", fmt::wstring_view(buffer, 4));
}
TEST(xchar_test, named_arg_udl) {
using namespace fmt::literals;
auto udl_a =