chromium/third_party/abseil-cpp/absl/container/internal/hashtable_debug_hooks.h

// Copyright 2018 The Abseil Authors.
//
// 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
//
//      https://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.
//
// Provides the internal API for hashtable_debug.h.

#ifndef ABSL_CONTAINER_INTERNAL_HASHTABLE_DEBUG_HOOKS_H_
#define ABSL_CONTAINER_INTERNAL_HASHTABLE_DEBUG_HOOKS_H_

#include <cstddef>

#include <algorithm>
#include <type_traits>
#include <vector>

#include "absl/base/config.h"

namespace absl {
ABSL_NAMESPACE_BEGIN
namespace container_internal {
namespace hashtable_debug_internal {

// If it is a map, call get<0>().
get;
template <typename T, typename = typename T::mapped_type>
auto GetKey(const typename T::value_type& pair, int) -> decltype(get<0>(pair)) { … }

// If it is not a map, return the value directly.
template <typename T>
const typename T::key_type& GetKey(const typename T::key_type& key, char) { … }

// Containers should specialize this to provide debug information for that
// container.
template <class Container, typename Enabler = void>
struct HashtableDebugAccess { … };

}  // namespace hashtable_debug_internal
}  // namespace container_internal
ABSL_NAMESPACE_END
}  // namespace absl

#endif  // ABSL_CONTAINER_INTERNAL_HASHTABLE_DEBUG_HOOKS_H_