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/*
* 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 HashCombine() {
return 0;
}
inline hash_code HashCombine(hash_code seed) {
return seed;
}
hash_code HashCombine(hash_code x, hash_code y);
template <typename T, typename... U>
inline hash_code HashCombine(const T& first, const U&... rest) {
return HashCombine(HashCombine(rest...), std::hash<T>()(first));
}
template <typename It>
inline hash_code HashRange(It first, It last) {
hash_code result = 0;
for (auto iter = first; iter != last; ++iter) {
result = HashCombine(result, *iter);
}
return result;
}
} // namespace wabt
#endif // WABT_HASH_UTIL_H_
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