/**
	This file is a part of rexy's general purpose library
	Copyright (C) 2020-2022 rexy712

	This program is free software: you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation, either version 3 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef REXY_DETAIL_HASALLOCATOR_HPP
#define REXY_DETAIL_HASALLOCATOR_HPP

#include "../compat/standard.hpp"
#include "../allocator.hpp"

#include <type_traits> //is_empty

namespace rexy::detail{

	template<REXY_ALLOCATOR_CONCEPT Alloc, bool EmptyAlloc = std::is_empty_v<Alloc>>
	struct hasallocator
	{
		Alloc m_alloc;

		REXY_CPP20_CONSTEXPR auto allocate(typename Alloc::size_type bytes)noexcept(is_nothrow_allocator_v<Alloc>){
			return m_alloc.allocate(bytes);
		}
		REXY_CPP20_CONSTEXPR void deallocate(typename Alloc::pointer p, typename Alloc::size_type bytes)noexcept(is_nothrow_allocator_v<Alloc>){
			m_alloc.deallocate(p, bytes);
		}

		constexpr Alloc& allocator(void){
			return m_alloc;
		}
		constexpr const Alloc& allocator(void)const{
			return m_alloc;
		}
	};
#if __has_cpp_attribute(no_unique_address)
	template<REXY_ALLOCATOR_CONCEPT Alloc>
	struct hasallocator<Alloc,true>
	{
		[[no_unique_address]]
		Alloc m_alloc;

		REXY_CPP20_CONSTEXPR auto allocate(typename Alloc::size_type bytes)noexcept(is_nothrow_allocator_v<Alloc>){
			return m_alloc.allocate(bytes);
		}
		REXY_CPP20_CONSTEXPR void deallocate(typename Alloc::pointer p, typename Alloc::size_type bytes)noexcept(is_nothrow_allocator_v<Alloc>){
			m_alloc.deallocate(p, bytes);
		}

		constexpr Alloc& allocator(void){
			return m_alloc;
		}
		constexpr const Alloc& allocator(void)const{
			return m_alloc;
		}
	};
#endif //no_unique_address
}

#endif