CRTPBase.hpp

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//          Copyright Dominic Koepke 2019 - 2023.
// 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_UTILITY_CRTP_BASE_HPP
#define SIMPLE_UTILITY_CRTP_BASE_HPP
 
#pragma once
 
#include "Simple-Utility/concepts/stl_extensions.hpp"
 
namespace sl
{
    template <concepts::unqualified Derived, class Disambiguity = void>
    class CRTPBase
    {
    protected:
        [[nodiscard]]
        constexpr const Derived& derived() const noexcept
        {
            return static_cast<const Derived&>(*this);
        }
 
        [[nodiscard]]
        constexpr Derived& derived() noexcept
        {
            return static_cast<Derived&>(*this);
        }
 
        constexpr CRTPBase() noexcept
        {
            static_assert(std::is_base_of_v<CRTPBase, Derived>, "Derived doesn't inherit from CRTPBase.");
        }
 
        CRTPBase(const CRTPBase&) = default;
 
        CRTPBase& operator =(const CRTPBase&) = default;
 
        CRTPBase(CRTPBase&&) = default;
 
        CRTPBase& operator =(CRTPBase&&) = default;
 
        ~CRTPBase() = default;
 
        [[nodiscard]]
        constexpr bool operator ==(const CRTPBase&) const noexcept = default;
    };
}
 
#endif