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add nameof_member for mscv and c++20

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This commit is contained in:
neargye 2022-07-21 21:07:19 +04:00
parent 32885c092e
commit 2cb9751cb6
1 changed files with 33 additions and 1 deletions
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34
include/nameof.hpp
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@ -96,7 +96,7 @@
#endif
// Checks nameof_member compiler compatibility.
#if defined(__clang__) && __clang_major__ >= 5 || defined(__GNUC__) && __GNUC__ >= 7
#if defined(__clang__) && __clang_major__ >= 5 || defined(__GNUC__) && __GNUC__ >= 7 || defined(_MSC_VER) && defined(_MSVC_LANG) && _MSVC_LANG >= 202002L
# undef NAMEOF_MEMBER_SUPPORTED
# define NAMEOF_MEMBER_SUPPORTED 1
#endif
@ -921,6 +921,8 @@ constexpr auto n() noexcept {
if constexpr (custom_name.empty() && nameof_member_supported<decltype(V)>::value) {
#if defined(__clang__) || defined(__GNUC__)
constexpr auto name = pretty_name({__PRETTY_FUNCTION__, sizeof(__PRETTY_FUNCTION__) - 2});
#elif defined(_MSC_VER) && defined(_MSVC_LANG) && _MSVC_LANG >= 202002L
constexpr auto name = pretty_name({__FUNCSIG__, sizeof(__FUNCSIG__) - 17});
#else
constexpr auto name = string_view{};
#endif
@ -930,8 +932,38 @@ constexpr auto n() noexcept {
}
}
#if defined(__clang__) || defined(__GNUC__)
template <auto V>
inline constexpr auto member_name_v = n<V>();
#elif defined(_MSC_VER) && defined(_MSVC_LANG) && _MSVC_LANG >= 202002L
template <typename From, typename Type>
From get_base_type(Type From::*);
template <typename T>
union union_type {
char c = {};
T f;
};
template <typename T>
inline constexpr auto v = T{};
template <auto V>
constexpr auto get_member_name() noexcept {
if constexpr (std::is_member_function_pointer_v<decltype(V)>) {
return n<V>();
} else {
return n<&(constexpr_static_init<union_type<decltype(get_base_type(V))>>.f.*V)>();
}
}
template <auto V>
inline constexpr auto member_name_v = get_member_name<V>();
#else
template <auto V>
inline constexpr auto member_name_v = cstring<0>{string_view{}};
#endif
} // namespace nameof::detail