Functional.hpp

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//          Copyright Dominic Koepke 2021 - 2022.
// Distributed under the Boost Software License, Version 1.0.
//    (See accompanying file LICENSE_1_0.txt or copy at
//          https://www.boost.org/LICENSE_1_0.txt)
 
#ifndef SIMPLE_VECTOR_FUNCTIONAL_HPP
#define SIMPLE_VECTOR_FUNCTIONAL_HPP
 
#pragma once
 
#include "Concepts.hpp"
 
#include <concepts>
#include <functional>
#include <utility>
 
namespace sl::vec::detail
{
    template <class TTargetType, std::copy_constructible TFunc>
    struct cast_invoke_result_fn
    {
        template <class... TArgs>
        constexpr TTargetType operator ()(TArgs&&... args)
        {
            return static_cast<TTargetType>(std::invoke(func, std::forward<TArgs>(args)...));
        }
 
        TFunc func;
    };
}
 
namespace sl::vec::fn
{
    template <class TTargetType, std::copy_constructible TFunc>
    constexpr auto cast_invoke_result(TFunc func) noexcept
    {
        return detail::cast_invoke_result_fn<TTargetType, TFunc>{ std::move(func) };
    }
 
}
 
#endif