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to_string supports types with format_as

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Signed-off-by: Vladislav Shchapov <vladislav@shchapov.ru>
This commit is contained in:
Vladislav Shchapov 2023-08-07 20:08:33 +05:00 committed by Victor Zverovich
parent 29ce2ff8a8
commit e150ea0cc2
2 changed files with 15 additions and 1 deletions
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9
include/fmt/format.h
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@ -4287,7 +4287,8 @@ auto join(Range&& range, string_view sep)
std::string answer = fmt::to_string(42);
\endrst
*/
template <typename T, FMT_ENABLE_IF(!std::is_integral<T>::value)>
template <typename T, FMT_ENABLE_IF(!std::is_integral<T>::value &&
!detail::has_format_as<T>::value)>
inline auto to_string(const T& value) -> std::string {
auto buffer = memory_buffer();
detail::write<char>(appender(buffer), value);
@ -4312,6 +4313,12 @@ FMT_NODISCARD auto to_string(const basic_memory_buffer<Char, SIZE>& buf)
return std::basic_string<Char>(buf.data(), size);
}
template <typename T, FMT_ENABLE_IF(!std::is_integral<T>::value &&
detail::has_format_as<T>::value)>
inline auto to_string(const T& value) -> std::string {
return to_string(format_as(value));
}
namespace detail {
template <typename Char>

7
test/format-test.cc
View File

@ -2141,6 +2141,13 @@ TEST(format_test, format_as) {
EXPECT_EQ(fmt::format("{}", test::struct_as_int()), "42");
}
TEST(format_test, format_as_to_string) {
EXPECT_EQ(fmt::to_string(test::scoped_enum_as_int()), "42");
EXPECT_EQ(fmt::to_string(test::scoped_enum_as_string_view()), "foo");
EXPECT_EQ(fmt::to_string(test::scoped_enum_as_string()), "foo");
EXPECT_EQ(fmt::to_string(test::struct_as_int()), "42");
}
template <typename Char, typename T> bool check_enabled_formatter() {
static_assert(std::is_default_constructible<fmt::formatter<T, Char>>::value,
"");