33 lines
997 B
C++
33 lines
997 B
C++
/*
|
|
* 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_
|