qx-typetraits.h

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#ifndef QX_TYPETRAITS_H
#define QX_TYPETRAITS_H
 
// Standard Library Includes
#include <type_traits>
 
namespace Qx
{
 
// Specialization
template <class A, template <typename...> class B>
struct is_specialization_of : std::false_type {};
 
template <typename... Args, template <typename...> class B>
struct is_specialization_of<B<Args...>, B> : std::true_type {};
 
template <typename A, template <typename...> class B>
inline constexpr bool is_specialization_of_v = is_specialization_of<A, B>::value;
 
// Containers
template <typename T>
struct unwrap { using type = T; };
 
template <typename T>
    requires requires { typename T::value_type; }
struct unwrap<T> { using type = typename T::value_type; };
 
template <typename T>
    requires requires { typename T::mapped_type; } && (!requires { typename T::value_type; })
struct unwrap<T> { using type = typename T::mapped_type; };
 
template<typename T>
using unwrap_t = typename unwrap<T>::type;
 
// Qualifiers
template<typename T>
using target_type = std::remove_pointer_t<std::remove_reference_t<T>>;
 
// Misc
template<class... T>
inline constexpr bool always_false = false;
 
}
 
#endif // QX_TYPETRAITS_H