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Au-lit/is_char.cpp

Last active April 15, 2021 22:35
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A C++ is_char type trait.
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is_char.cpp
// © Copyright 2021 Ollivier Roberge
#ifndef IS_CHAR_IMPL
#define IS_CHAR_IMPL
#include <type_traits>
template<typename T> struct is_char : std::false_type {};
template<> struct is_char<char> : std::true_type {};
template<> struct is_char<wchar_t> : std::true_type {};
template<> struct is_char<char16_t> : std::true_type {};
template<> struct is_char<char32_t> : std::true_type {};
#if __cpp_char8_t >= 201811L
template<> struct is_char<char8_t> : std::true_type {};
#endif
#if __cpp_inline_variables >= 201606L
template<typename T> inline constexpr bool is_char_v = is_char<T>::value;
#endif
#if __cpp_concepts >= 201907L
template<typename T> concept character = is_char<T>::value;
#endif
#endif // !defined(IS_CHAR_IMPL)
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