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/*
* Copyright (c) 2021 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef RTC_BASE_HASH_H_
#define RTC_BASE_HASH_H_
#include <stddef.h>
#include <functional>
#include <utility>
namespace webrtc {
// A custom hash function for std::pair, to be able to be used as key in a
// std::unordered_map. If absl::flat_hash_map would ever be used, this is
// unnecessary as it already has a hash function for std::pair.
struct PairHash {
template <class T1, class T2>
size_t operator()(const std::pair<T1, T2>& p) const {
return (3 * std::hash<T1>{}(p.first)) ^ std::hash<T2>{}(p.second);
}
};
} // namespace webrtc
#endif // RTC_BASE_HASH_H_
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