stringhash.h

/*
 * Copyright (C) 2018 Microchip Technology Inc.  All rights reserved.
 *
 * SPDX-License-Identifier: Apache-2.0
 */
#ifndef EGT_DETAIL_STRINGHASH_H
#define EGT_DETAIL_STRINGHASH_H
 
#include <string>
 
namespace egt
{
inline namespace v1
{
namespace detail
{
 
// Copyright (c) 2014 Sean Farrell <sean.farrell@rioki.org>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
 
constexpr unsigned int hash(const char* str, int h = 0)
{
    // NOLINTNEXTLINE(cppcoreguidelines-pro-bounds-pointer-arithmetic,readability-implicit-bool-conversion)
    return !str[h] ? 5381 : (hash(str, h + 1) * 33) ^ str[h];
}
 
inline unsigned int hash(const std::string& str)
{
    return hash(str.c_str());
}
 
}
}
}
 
#endif