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improving nameof_type & nameof_enum

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neargye 2019-08-25 17:32:05 +05:00
parent e62d87432f
commit 44833f2272
1 changed files with 28 additions and 21 deletions
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49
include/nameof.hpp
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@ -83,13 +83,16 @@ struct identity final {
using type = T;
};
template <typename... T>
struct always_false final : std::false_type {};
template <typename T>
using remove_cvref_t = std::remove_cv_t<std::remove_reference_t<T>>;
template <typename T, typename R>
using enable_if_enum_t = std::enable_if_t<std::is_enum_v<remove_cvref_t<T>>, R>;
template <typename T>
template <typename T = void>
[[nodiscard]] constexpr std::string_view nameof_impl(std::string_view name, bool remove_template_suffix = true) noexcept {
static_assert(std::is_void_v<T>, "nameof::detail::nameof_impl requires void type.");
if (name.length() >= 1 && (name.front() == '"' || name.front() == '\'')) {
@ -178,16 +181,15 @@ template <typename T>
}
template <typename E, E V>
[[nodiscard]] constexpr std::string_view nameof_enum_impl() noexcept {
static_assert(std::is_enum_v<E>, "nameof::nameof_enum_impl requires enum type.");
#if defined(__clang__)
return nameof_impl<void>({__PRETTY_FUNCTION__, sizeof(__PRETTY_FUNCTION__) - 2});
#elif defined(__GNUC__) && __GNUC__ >= 9
return nameof_impl<void>({__PRETTY_FUNCTION__, sizeof(__PRETTY_FUNCTION__) - 51});
[[nodiscard]] constexpr auto nameof_enum_impl() noexcept {
static_assert(std::is_enum_v<E>, "nameof::detail::nameof_enum_impl requires enum type.");
#if defined(__clang__) || defined(__GNUC__) && __GNUC__ >= 9
return nameof_impl({__PRETTY_FUNCTION__, sizeof(__PRETTY_FUNCTION__) - 2});
#elif defined(_MSC_VER)
return nameof_impl<void>({__FUNCSIG__, sizeof(__FUNCSIG__) - 17});
return nameof_impl({__FUNCSIG__, sizeof(__FUNCSIG__) - 17});
#else
return {}; // Unsupported compiler.
static_assert(always_false<E>{}, "nameof::nameof_enum: Unsupported compiler (https://github.com/Neargye/nameof#compiler-compatibility).");
return std::string_view{}; // Unsupported compiler.
#endif
}
@ -199,15 +201,16 @@ template <typename E, int O, int... I>
}
template <typename... T>
[[nodiscard]] constexpr std::string_view nameof_type_impl() noexcept {
[[nodiscard]] constexpr auto nameof_type_impl() noexcept {
#if defined(__clang__)
return {__PRETTY_FUNCTION__ + 83, sizeof(__PRETTY_FUNCTION__) - 87 - (__PRETTY_FUNCTION__[sizeof(__PRETTY_FUNCTION__) - 5] == ' ' ? 1 : 0)};
return std::string_view{__PRETTY_FUNCTION__ + 46, sizeof(__PRETTY_FUNCTION__) - 49};
#elif defined(__GNUC__)
return {__PRETTY_FUNCTION__ + 98, sizeof(__PRETTY_FUNCTION__) - 151 - (__PRETTY_FUNCTION__[sizeof(__PRETTY_FUNCTION__) - 54] == ' ' ? 1 : 0)};
return std::string_view{__PRETTY_FUNCTION__ + 61, sizeof(__PRETTY_FUNCTION__) - 64};
#elif defined(_MSC_VER)
return {__FUNCSIG__ + 139, sizeof(__FUNCSIG__) - 157 - (__FUNCSIG__[sizeof(__FUNCSIG__) - 19] == ' ' ? 1 : 0)};
return std::string_view{__FUNCSIG__ + 78, sizeof(__FUNCSIG__) - 96 - (__FUNCSIG__[sizeof(__FUNCSIG__) - 19] == ' ' ? 1 : 0)};
#else
return {}; // Unsupported compiler.
static_assert(always_false<T...>{}, "nameof::nameof_type: Unsupported compiler (https://github.com/Neargye/nameof#compiler-compatibility).");
return std::string_view{}; // Unsupported compiler.
#endif
}
@ -243,22 +246,26 @@ template <auto V>
return detail::nameof_enum_impl<D, V>();
}
// Obtains string name of type, reference and cv-qualifiers are ignored.
template <typename T>
[[nodiscard]] constexpr std::string_view nameof_type() noexcept {
return detail::nameof_type_impl<detail::identity<detail::remove_cvref_t<T>>>();
}
// Obtains string name of full type, with reference and cv-qualifiers.
template <typename T>
[[nodiscard]] constexpr std::string_view nameof_full_type() noexcept {
#if defined(_MSC_VER)
return detail::nameof_type_impl<detail::identity<T>>();
#else
return detail::nameof_type_impl<T>();
#endif
}
// Obtains string name of type, reference and cv-qualifiers are ignored.
template <typename T>
[[nodiscard]] constexpr std::string_view nameof_type() noexcept {
return nameof_full_type<detail::remove_cvref_t<T>>();
}
} // namespace nameof
// Obtains simple (unqualified) string name of variable, function, enum, macro.
#define NAMEOF(...) ::nameof::detail::nameof_impl<::std::void_t<decltype(__VA_ARGS__)>>(#__VA_ARGS__)
#define NAMEOF(...) ::nameof::detail::nameof_impl<::std::void_t<decltype(__VA_ARGS__)>>(#__VA_ARGS__, true)
// Obtains simple (unqualified) full (with template suffix) string name of variable, function, enum, macro.
#define NAMEOF_FULL(...) ::nameof::detail::nameof_impl<::std::void_t<decltype(__VA_ARGS__)>>(#__VA_ARGS__, false)