recursive_lambda.hpp

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// SPDX-License-Identifier: BSD-2-Clause
 
#ifndef pRC_CORE_BASIC_RECURSIVE_LAMBDA_H
#define pRC_CORE_BASIC_RECURSIVE_LAMBDA_H
 
#include <prc/core/basic/concepts.hpp>
 
namespace pRC
{
    template<class L>
    class RecursiveLambda
    {
    public:
        RecursiveLambda(RecursiveLambda const &) = delete;
        RecursiveLambda &operator=(RecursiveLambda const &) = delete;
 
        template<class X>
            requires IsConstructible<L, X>
        constexpr RecursiveLambda(X &&lambda)
            : mLambda(std::forward<X>(lambda))
        {
        }
 
        template<auto... Ps, class... Xs>
        constexpr decltype(auto) operator()(Xs &&...args) const
        {
            return mLambda.template operator()<Ps...>(*this,
                forward<Xs>(args)...);
        }
 
        template<auto... Ps, class... Xs>
        constexpr decltype(auto) operator()(Xs &&...args)
        {
            return mLambda.template operator()<Ps...>(*this,
                forward<Xs>(args)...);
        }
 
    private:
        L mLambda;
    };
 
    template<class X>
    RecursiveLambda(X &&) -> RecursiveLambda<RemoveReference<X>>;
}
#endif // pRC_CORE_BASIC_RECURSIVE_LAMBDA_H