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combined write_variant_alternative and write_expected_alternative

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dominic 2024-01-31 16:41:41 +01:00
parent 961d4dd830
commit 831d135ccb
1 changed files with 15 additions and 18 deletions
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33
include/fmt/std.h
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@ -246,12 +246,13 @@ struct formatter<std::optional<T>, Char,
FMT_END_NAMESPACE
#endif // __cpp_lib_optional
#ifdef __cpp_lib_expected
#if defined(__cpp_lib_expected) || FMT_CPP_LIB_VARIANT
FMT_BEGIN_NAMESPACE
namespace detail {
template <typename Char, typename OutputIt, typename T>
auto write_expected_alternative(OutputIt out, const T& v) -> OutputIt {
auto write_escaped_alternative(OutputIt out, const T& v) -> OutputIt {
if constexpr (has_to_string_view<T>::value)
return write_escaped_string<Char>(out, detail::to_string_view(v));
else if constexpr (std::is_same_v<T, Char>)
@ -262,11 +263,17 @@ auto write_expected_alternative(OutputIt out, const T& v) -> OutputIt {
} // namespace detail
FMT_END_NAMESPACE
#endif
#ifdef __cpp_lib_expected
FMT_BEGIN_NAMESPACE
FMT_EXPORT
template <typename T, typename E, typename Char>
struct formatter<std::expected<T, E>, Char,
std::enable_if_t<std::conjunction_v<
is_formattable<T, Char>, is_formattable<E, Char>>>> {
struct formatter<
std::expected<T, E>, Char,
std::enable_if_t<is_formattable<T, Char> && is_formattable<E, Char>>> {
template <typename ParseContext>
FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
return ctx.begin();
@ -279,10 +286,10 @@ struct formatter<std::expected<T, E>, Char,
if (value.has_value()) {
out = detail::write<Char>(out, "expected(");
out = detail::write_expected_alternative<Char>(out, value.value());
out = detail::write_escaped_alternative<Char>(out, value.value());
} else {
out = detail::write<Char>(out, "unexpected(");
out = detail::write_expected_alternative<Char>(out, value.error());
out = detail::write_escaped_alternative<Char>(out, value.error());
}
*out++ = ')';
return out;
@ -340,16 +347,6 @@ template <typename T, typename C> class is_variant_formattable_ {
decltype(check(variant_index_sequence<T>{}))::value;
};
template <typename Char, typename OutputIt, typename T>
auto write_variant_alternative(OutputIt out, const T& v) -> OutputIt {
if constexpr (has_to_string_view<T>::value)
return write_escaped_string<Char>(out, detail::to_string_view(v));
else if constexpr (std::is_same_v<T, Char>)
return write_escaped_char(out, v);
else
return write<Char>(out, v);
}
} // namespace detail
template <typename T> struct is_variant_like {
@ -395,7 +392,7 @@ struct formatter<
FMT_TRY {
std::visit(
[&](const auto& v) {
out = detail::write_variant_alternative<Char>(out, v);
out = detail::write_escaped_alternative<Char>(out, v);
},
value);
}