/**
	This file is a part of rexy's general purpose library
	Copyright (C) 2020 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_HASH_HPP
#define REXY_HASH_HPP

#include <climits> //CHAR_BIT
#include "rexy.hpp"

namespace rexy{

	template<class T>
	struct hash{
		constexpr size_t operator()(const T& t, size_t salt = 0)const noexcept{
			constexpr size_t bytes = sizeof(size_t);
			size_t val = static_cast<size_t>(t);
			size_t hash = 5381 + salt; //magic hash number
			for(size_t i = 0;i < bytes;++i){
				unsigned char c = static_cast<unsigned char>(val >> (i * CHAR_BIT));
				hash = ((hash << 5) + hash) ^ c;
			}
			return hash;
		}
	};

}

#ifdef REXY_STRING_VIEW_HPP
#include "string_view_hash.hpp"
#endif
#ifdef REXY_STRING_HPP
#include "basic_string_hash.hpp"
#endif
#ifdef REXY_CX_STRING_HPP
#include "cx/cx_string_hash.hpp"
#endif

#endif