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construct/include/ircd/hash.h

72 lines
2.2 KiB
C++

/*
* charybdis: 21st Century IRC++d
*
* Copyright (C) 2017 Charybdis Development Team
* Copyright (C) 2017 Jason Volk <jason@zemos.net>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice is present in all copies.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*/
#pragma once
#define HAVE_IRCD_HASH_H
namespace ircd
{
constexpr size_t hash(const char *const &str, const size_t i = 0);
constexpr size_t hash(const char16_t *const &str, const size_t i = 0);
size_t hash(const std::string_view &str, const size_t i = 0);
size_t hash(const std::string &str, const size_t i = 0);
size_t hash(const std::u16string &str, const size_t i = 0);
}
constexpr size_t
ircd::hash(const char *const &str,
const size_t i)
{
return !str[i]? 7681ULL : (hash(str, i+1) * 33ULL) ^ str[i];
}
inline size_t
ircd::hash(const std::string_view &str,
const size_t i)
{
return i >= str.size()? 7681ULL : (hash(str, i+1) * 33ULL) ^ str.at(i);
}
inline size_t
ircd::hash(const std::string &str,
const size_t i)
{
return i >= str.size()? 7681ULL : (hash(str, i+1) * 33ULL) ^ str.at(i);
}
constexpr size_t
ircd::hash(const char16_t *const &str,
const size_t i)
{
return !str[i]? 7681ULL : (hash(str, i+1) * 33ULL) ^ str[i];
}
inline size_t
ircd::hash(const std::u16string &str,
const size_t i)
{
return i >= str.size()? 7681ULL : (hash(str, i+1) * 33ULL) ^ str.at(i);
}