kc3-lang/angle/src/common/hash_containers.h

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• Hash : df90bbc5
  Author :
  Date : 2024-07-12T18:04:53
  

  Refactoring: move angle::HashMap and HashSet to own header
  
  Underlying abseil includes pull in a large set of headers
  
  Bug: angleproject:42266508
  Change-Id: Icee47143a8a59bb0795a054b67c0aa4ddcfca4d4
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/5704137
  Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
  Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
  

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• src/common/hash_containers.h

• //
  // Copyright 2024 The ANGLE 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.
  //
  
  // hash_containers.h: angle::HashMap and HashSet
  
  #ifndef COMMON_HASH_CONTAINERS_H_
  #define COMMON_HASH_CONTAINERS_H_
  
  #if defined(ANGLE_USE_ABSEIL)
  #    include "absl/container/flat_hash_map.h"
  #    include "absl/container/flat_hash_set.h"
  #else
  #    include <unordered_map>
  #    include <unordered_set>
  #endif  // defined(ANGLE_USE_ABSEIL)
  
  namespace angle
  {
  
  #if defined(ANGLE_USE_ABSEIL)
  template <typename Key,
            typename T,
            class Hash = absl::container_internal::hash_default_hash<Key>,
            class Eq   = absl::container_internal::hash_default_eq<Key>>
  using HashMap = absl::flat_hash_map<Key, T, Hash, Eq>;
  template <typename Key,
            class Hash = absl::container_internal::hash_default_hash<Key>,
            class Eq   = absl::container_internal::hash_default_eq<Key>>
  using HashSet = absl::flat_hash_set<Key, Hash, Eq>;
  
  // Absl has generic lookup unconditionally
  #    define ANGLE_HAS_HASH_MAP_GENERIC_LOOKUP 1
  #else
  template <typename Key,
            typename T,
            class Hash     = std::hash<Key>,
            class KeyEqual = std::equal_to<Key>>
  using HashMap = std::unordered_map<Key, T, Hash, KeyEqual>;
  template <typename Key, class Hash = std::hash<Key>, class KeyEqual = std::equal_to<Key>>
  using HashSet = std::unordered_set<Key, Hash, KeyEqual>;
  #    if __cpp_lib_generic_unordered_lookup >= 201811L
  #        define ANGLE_HAS_HASH_MAP_GENERIC_LOOKUP 1
  #    else
  #        define ANGLE_HAS_HASH_MAP_GENERIC_LOOKUP 0
  #    endif
  #endif  // defined(ANGLE_USE_ABSEIL)
  
  }  // namespace angle
  
  #endif  // COMMON_HASH_CONTAINERS_H_
  

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