add.hpp

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// SPDX-License-Identifier: BSD-2-Clause
 
#ifndef pRC_CORE_FUNCTORS_ADD_H
#define pRC_CORE_FUNCTORS_ADD_H
 
#include <prc/core/basic/functions/zero.hpp>
#include <prc/core/basic/type_traits.hpp>
 
namespace pRC
{
    struct Add
    {
        template<class T, If<IsInvocable<Zero<T>>> = 0>
        static constexpr auto Identity()
        {
            return zero<T>();
        }
 
        template<class XA, class XB,
            If<True<decltype(declval<XA>() + declval<XB>())>> = 0>
        constexpr decltype(auto) operator()(XA &&a, XB &&b) const
        {
            return forward<XA>(a) + forward<XB>(b);
        }
    };
}
#endif // pRC_CORE_FUNCTORS_ADD_H