mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-24 21:31:04 +00:00
7bc752e42b
Also move MOZ_MUST_USE before function declarations' specifiers and return type. While clang and gcc's __attribute__((warn_unused_result)) can appear before, between, or after function specifiers and return types, the [[nodiscard]] attribute must precede the function specifiers. Depends on D108344 Differential Revision: https://phabricator.services.mozilla.com/D108345
76 lines
2.0 KiB
C++
76 lines
2.0 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
/* Utilities for hashing pairs. */
|
|
|
|
#ifndef mozilla_PairHash_h
|
|
#define mozilla_PairHash_h
|
|
|
|
#include "mozilla/CompactPair.h"
|
|
#include "mozilla/HashFunctions.h"
|
|
|
|
#include <utility> // std::pair
|
|
|
|
namespace mozilla {
|
|
|
|
/**
|
|
* The HashPair overloads below do just what you'd expect.
|
|
*
|
|
* These functions support hash of std::pair<T,U> and mozilla::CompactPair<T,u>
|
|
* where type T and U both support AddToHash.
|
|
*/
|
|
template <typename U, typename V>
|
|
[[nodiscard]] inline HashNumber HashPair(const std::pair<U, V>& pair) {
|
|
// Pair hash combines the hash of each member
|
|
return HashGeneric(pair.first, pair.second);
|
|
}
|
|
|
|
template <typename U, typename V>
|
|
[[nodiscard]] inline HashNumber HashCompactPair(const CompactPair<U, V>& pair) {
|
|
// Pair hash combines the hash of each member
|
|
return HashGeneric(pair.first(), pair.second());
|
|
}
|
|
|
|
/**
|
|
* Hash policy for std::pair compatible with HashTable
|
|
*/
|
|
template <typename T, typename U>
|
|
struct PairHasher {
|
|
using Key = std::pair<T, U>;
|
|
using Lookup = Key;
|
|
|
|
static HashNumber hash(const Lookup& aLookup) { return HashPair(aLookup); }
|
|
|
|
static bool match(const Key& aKey, const Lookup& aLookup) {
|
|
return aKey == aLookup;
|
|
}
|
|
|
|
static void rekey(Key& aKey, const Key& aNewKey) { aKey = aNewKey; }
|
|
};
|
|
|
|
/**
|
|
* Hash policy for mozilla::CompactPair compatible with HashTable
|
|
*/
|
|
template <typename T, typename U>
|
|
struct CompactPairHasher {
|
|
using Key = CompactPair<T, U>;
|
|
using Lookup = Key;
|
|
|
|
static HashNumber hash(const Lookup& aLookup) {
|
|
return HashCompactPair(aLookup);
|
|
}
|
|
|
|
static bool match(const Key& aKey, const Lookup& aLookup) {
|
|
return aKey == aLookup;
|
|
}
|
|
|
|
static void rekey(Key& aKey, const Key& aNewKey) { aKey = aNewKey; }
|
|
};
|
|
|
|
} // namespace mozilla
|
|
|
|
#endif /* mozilla_PairHash_h */
|