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Fix std::byte formatting with compile-time API #2072

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merged 4 commits into from
Dec 27, 2020
Merged

Fix std::byte formatting with compile-time API #2072

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cc4a995
add test for byte formatting with `FMT_COMPILE`
alexezeder Dec 22, 2020
0e89ada
fix byte formatting with `FMT_COMPILE`, use `__cpp_lib_byte` macro
alexezeder Dec 22, 2020
0446614
use is not custom mapped type check
alexezeder Dec 23, 2020
417b35b
workaround MSVC bug
alexezeder Dec 25, 2020
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13 changes: 9 additions & 4 deletions include/fmt/format.h
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Original file line number Diff line number Diff line change
Expand Up @@ -2111,9 +2111,14 @@ FMT_CONSTEXPR OutputIt write(OutputIt out, T value) {
return base_iterator(out, it);
}

template <typename Char, typename OutputIt, typename T,
FMT_ENABLE_IF(std::is_enum<T>::value &&
!std::is_same<T, Char>::value)>
// FMT_ENABLE_IF() condition separated to workaround MSVC bug
template <
typename Char, typename OutputIt, typename T,
bool check =
std::is_enum<T>::value && !std::is_same<T, Char>::value &&
mapped_type_constant<T, basic_format_context<OutputIt, Char>>::value !=
type::custom_type,
FMT_ENABLE_IF(check)>
FMT_CONSTEXPR OutputIt write(OutputIt out, T value) {
return write<Char>(
out, static_cast<typename std::underlying_type<T>::type>(value));
Expand Down Expand Up @@ -3562,7 +3567,7 @@ FMT_FORMAT_AS(Char*, const Char*);
FMT_FORMAT_AS(std::basic_string<Char>, basic_string_view<Char>);
FMT_FORMAT_AS(std::nullptr_t, const void*);
FMT_FORMAT_AS(detail::std_string_view<Char>, basic_string_view<Char>);
#if __cplusplus >= 201703L
#ifdef __cpp_lib_byte
FMT_FORMAT_AS(std::byte, unsigned);
#endif

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3 changes: 3 additions & 0 deletions test/compile-test.cc
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Expand Up @@ -133,6 +133,9 @@ TEST(CompileTest, FormatDefault) {
EXPECT_EQ("foo", fmt::format(FMT_COMPILE("{}"), "foo"));
EXPECT_EQ("foo", fmt::format(FMT_COMPILE("{}"), std::string("foo")));
EXPECT_EQ("foo", fmt::format(FMT_COMPILE("{}"), test_formattable()));
# ifdef __cpp_lib_byte
EXPECT_EQ("42", fmt::format(FMT_COMPILE("{}"), std::byte{42}));
# endif
}

TEST(CompileTest, FormatWideString) {
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2 changes: 1 addition & 1 deletion test/format-test.cc
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Expand Up @@ -1762,7 +1762,7 @@ TEST(FormatTest, JoinArg) {
#endif
}

#if __cplusplus >= 201703L
#ifdef __cpp_lib_byte
TEST(FormatTest, JoinBytes) {
std::vector<std::byte> v = {std::byte(1), std::byte(2), std::byte(3)};
EXPECT_EQ("1, 2, 3", fmt::format("{}", fmt::join(v, ", ")));
Expand Down