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Add fmt::enums::format_as

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This commit is contained in:
Victor Zverovich 2022-02-19 08:03:42 -08:00
parent 1319719a5e
commit aad44f2839
2 changed files with 13 additions and 0 deletions
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7
include/fmt/format.h
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@ -2891,6 +2891,13 @@ constexpr auto underlying(Enum e) noexcept -> underlying_t<Enum> {
return static_cast<underlying_t<Enum>>(e); return static_cast<underlying_t<Enum>>(e);
} }
namespace enums {
template <typename Enum, FMT_ENABLE_IF(std::is_enum<Enum>::value)>
constexpr auto format_as(Enum e) noexcept -> underlying_t<Enum> {
return static_cast<underlying_t<Enum>>(e);
}
}
#ifdef __cpp_lib_byte #ifdef __cpp_lib_byte
inline auto format_as(std::byte b) -> unsigned char { return underlying(b); } inline auto format_as(std::byte b) -> unsigned char { return underlying(b); }
FMT_FORMAT_AS(std::byte, unsigned char); FMT_FORMAT_AS(std::byte, unsigned char);

6
test/format-test.cc
View File

@ -1459,8 +1459,14 @@ TEST(format_test, write_uintptr_fallback) {
enum class color { red, green, blue }; enum class color { red, green, blue };
namespace test_ns {
enum class color { red, green, blue };
using fmt::enums::format_as;
} // namespace test_ns
TEST(format_test, format_enum_class) { TEST(format_test, format_enum_class) {
EXPECT_EQ(fmt::format("{}", fmt::underlying(color::red)), "0"); EXPECT_EQ(fmt::format("{}", fmt::underlying(color::red)), "0");
EXPECT_EQ(fmt::format("{}", test_ns::color::red), "0");
} }
TEST(format_test, format_string) { TEST(format_test, format_string) {