Placeholder.h

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#pragma once

namespace scl{
    namespace utils{
        struct Placeholder final{
            constexpr Placeholder() = default;
            constexpr Placeholder(const Placeholder&) = default;
            constexpr Placeholder(Placeholder&&) = default;
            Placeholder& operator=(const Placeholder&) = default;
            Placeholder& operator=(Placeholder&&) = default;
            ~Placeholder() = default;

            template <class T>
            constexpr Placeholder(T&&){}

            template <class T>
            constexpr const Placeholder& operator=(T&&) const{ return *this; }
        };


        namespace placeholder{
            constexpr scl::utils::Placeholder _ = {};
        }
    }
}