mpusz/mp-units
1
0
Fork 1
mirror of https://github.com/mpusz/mp-units.git synced 2025-08-03 12:24:26 +02:00
Code Issues Packages Projects Releases Wiki Activity

feat: underlying_type type trait added

Browse Source
This commit is contained in:
Mateusz Pusz
2024-01-19 16:03:21 +01:00
parent d036af5647
commit fc7e1358cb
1 changed files with 30 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

30
src/core/include/mp-units/bits/external/type_traits.h vendored
View File

@@ -83,6 +83,36 @@ template<typename T, template<typename...> typename Type>
// inline constexpr bool // TODO: Replace with concept when it works with MSVC
concept is_derived_from_specialization_of = requires(T* t) { detail::to_base_specialization_of<Type>(t); };
namespace detail {
template<typename T>
struct get_value_type {
using type = MP_UNITS_TYPENAME T::value_type;
};
template<typename T>
struct get_element_type {
using type = std::remove_reference_t<typename T::element_type>;
};
} // namespace detail
template<typename T>
struct underlying_type {
using type = T;
};
template<typename T>
requires requires { typename T::value_type; } || requires { typename T::element_type; }
struct underlying_type<T> {
using type = MP_UNITS_TYPENAME
conditional<requires { typename T::value_type; }, detail::get_value_type<T>, detail::get_element_type<T>>::type;
};
template<typename T>
using underlying_type_t = MP_UNITS_TYPENAME underlying_type<T>::type;
template<typename T, typename... Ts>
concept one_of = (false || ... || std::same_as<T, Ts>);