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Cleanup string traits

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This commit is contained in:
Victor Zverovich
2024-01-05 17:48:12 -08:00
parent 1e938dda20
commit 0641b844ac
6 changed files with 36 additions and 54 deletions
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20
include/fmt/ranges.h
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@@ -41,23 +41,6 @@ template <typename OutputIt> auto copy(wchar_t ch, OutputIt out) -> OutputIt {
return out;
}
// Returns true if T has a std::string-like interface, like std::string_view.
template <typename T> class is_std_string_like {
template <typename U>
static auto check(U* p)
-> decltype((void)p->find('a'), p->length(), (void)p->data(), int());
template <typename> static void check(...);
public:
static constexpr const bool value =
is_string<T>::value ||
std::is_convertible<T, std_string_view<char>>::value ||
!std::is_void<decltype(check<T>(nullptr))>::value;
};
template <typename Char>
struct is_std_string_like<fmt::basic_string_view<Char>> : std::true_type {};
template <typename T> class is_map {
template <typename U> static auto check(U*) -> typename U::mapped_type;
template <typename> static void check(...);
@@ -377,7 +360,8 @@ struct formatter<Tuple, Char,
template <typename T, typename Char> struct is_range {
static constexpr const bool value =
detail::is_range_<T>::value && !detail::is_std_string_like<T>::value &&
detail::is_range_<T>::value &&
!detail::has_to_string_view<T>::value &&
!std::is_convertible<T, std::basic_string<Char>>::value &&
!std::is_convertible<T, detail::std_string_view<Char>>::value;
};