is_overflow_tag.h

 
//          Copyright John McFarlane 2018.
// Distributed under the Boost Software License, Version 1.0.
//    (See accompanying file ../LICENSE_1_0.txt or copy at
//          http://www.boost.org/LICENSE_1_0.txt)
 
#if !defined(CNL_IMPL_OVERFLOW_IS_OVERFLOW_TAG_H)
#define CNL_IMPL_OVERFLOW_IS_OVERFLOW_TAG_H
 
#include "../custom_operator/is_same_tag_family.h"
 
#include <type_traits>
 
namespace cnl {
    namespace _impl {
        template<typename Tag>
        struct is_overflow_tag : std::false_type {
        };
    }
 
    template<class T>
    concept overflow_tag = _impl::is_overflow_tag<T>::value;
 
    namespace _impl
    {
        template<overflow_tag Tag1, overflow_tag Tag2>
        struct is_same_tag_family<Tag1, Tag2>
            : std::true_type {
        };
    }
}
 
#endif  // CNL_IMPL_OVERFLOW_IS_OVERFLOW_TAG_H