Hash.h

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#pragma once

#include <scl/macros.h>
#include <scl/concepts/FunctionObject.h>
#include <scl/concepts/CopyConstructible.h>
#include <scl/concepts/Destructible.h>
#include <scl/tools/meta/is_same.h>

namespace scl{
    namespace concepts{
        template <class T, class Key>
        struct Hash{
            constexpr operator bool() const{
                return FunctionObject<T, Key>{}
                && CopyConstructible<T>{}
                && Destructible<T>{}
                && META::is_same<
                    decltype(std::declval<T>()(std::declval<Key>())), //call of T(Key)
                    std::size_t
                >();
            }
        };
    }
}