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Fix format_to + FMT_STRING for wide character type (#3931)

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Added overload that takes a wformat_string.
Fixes issue #3925.
This commit is contained in:
Hans-Martin B. Jensen 2024-04-17 17:30:48 +02:00 committed by GitHub
parent 99735764ea
commit ee0c3351a4
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GPG Key ID: B5690EEEBB952194
2 changed files with 16 additions and 2 deletions
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12
include/fmt/xchar.h
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@ -141,6 +141,13 @@ auto format(wformat_string<T...> fmt, T&&... args) -> std::wstring {
return vformat(fmt::wstring_view(fmt), fmt::make_wformat_args(args...));
}
template <typename OutputIt, typename... T>
auto format_to(OutputIt out, wformat_string<T...> fmt, T&&... args)
-> OutputIt {
return vformat_to(out, fmt::wstring_view(fmt),
fmt::make_wformat_args(args...));
}
// Pass char_t as a default template parameter instead of using
// std::basic_string<char_t<S>> to reduce the symbol size.
template <typename S, typename... T,
@ -186,8 +193,9 @@ auto vformat_to(OutputIt out, const S& format_str,
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(OutputIt out, const S& fmt, T&&... args) -> OutputIt {
return vformat_to(out, detail::to_string_view(fmt),
fmt::make_format_args<buffered_context<Char>>(args...));

6
test/xchar-test.cc
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@ -195,6 +195,12 @@ TEST(xchar_test, format_to) {
EXPECT_STREQ(buf.data(), L"42");
}
TEST(xchar_test, compile_time_string_format_to) {
std::wstring ws;
fmt::format_to(std::back_inserter(ws), FMT_STRING(L"{}"), 42);
EXPECT_EQ(L"42", ws);
}
TEST(xchar_test, vformat_to) {
int n = 42;
auto args = fmt::make_wformat_args(n);