| /* |
| * Copyright 2017 WebAssembly Community Group participants |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef WABT_HASH_UTIL_H_ |
| #define WABT_HASH_UTIL_H_ |
| |
| #include <cstdlib> |
| #include <functional> |
| |
| namespace wabt { |
| |
| typedef std::size_t hash_code; |
| |
| inline hash_code hash_combine() { return 0; } |
| inline hash_code hash_combine(hash_code seed) { return seed; } |
| hash_code hash_combine(hash_code x, hash_code y); |
| |
| template <typename T, typename... U> |
| inline hash_code hash_combine(const T& first, const U&... rest) { |
| return hash_combine(hash_combine(rest...), std::hash<T>()(first)); |
| } |
| |
| template <typename It> |
| inline hash_code hash_range(It first, It last) { |
| hash_code result = 0; |
| for (auto iter = first; iter != last; ++iter) { |
| result = hash_combine(result, *iter); |
| } |
| return result; |
| } |
| |
| } // namespace wabt |
| |
| #endif // WABT_HASH_UTIL_H_ |