subscript.hpp

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// SPDX-License-Identifier: BSD-2-Clause
 
#ifndef pRC_CORE_FUNCTORS_SUBSCRIPT_H
#define pRC_CORE_FUNCTORS_SUBSCRIPT_H
 
#include <prc/core/basic/concepts.hpp>
 
namespace pRC
{
    struct Subscript
    {
        template<class X>
            requires requires { declval<X>()[declval<Index const>()]; }
        constexpr decltype(auto) operator()(X &&a, Index const index) const
        {
            return forward<X>(a)[index];
        }
    };
 
    template<class T>
    concept IsSubscriptable = IsInvocable<Subscript, T, Index>;
}
#endif // pRC_CORE_FUNCTORS_SUBSCRIPT_H