mirror of
https://github.com/DrKLO/Telegram.git
synced 2024-12-23 15:00:50 +01:00
600 lines
23 KiB
C++
600 lines
23 KiB
C++
// 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.
|
|
//
|
|
// -----------------------------------------------------------------------------
|
|
// File: flat_hash_map.h
|
|
// -----------------------------------------------------------------------------
|
|
//
|
|
// An `absl::flat_hash_map<K, V>` is an unordered associative container of
|
|
// unique keys and associated values designed to be a more efficient replacement
|
|
// for `std::unordered_map`. Like `unordered_map`, search, insertion, and
|
|
// deletion of map elements can be done as an `O(1)` operation. However,
|
|
// `flat_hash_map` (and other unordered associative containers known as the
|
|
// collection of Abseil "Swiss tables") contain other optimizations that result
|
|
// in both memory and computation advantages.
|
|
//
|
|
// In most cases, your default choice for a hash map should be a map of type
|
|
// `flat_hash_map`.
|
|
|
|
#ifndef ABSL_CONTAINER_FLAT_HASH_MAP_H_
|
|
#define ABSL_CONTAINER_FLAT_HASH_MAP_H_
|
|
|
|
#include <cstddef>
|
|
#include <new>
|
|
#include <type_traits>
|
|
#include <utility>
|
|
|
|
#include "absl/algorithm/container.h"
|
|
#include "absl/container/internal/container_memory.h"
|
|
#include "absl/container/internal/hash_function_defaults.h" // IWYU pragma: export
|
|
#include "absl/container/internal/raw_hash_map.h" // IWYU pragma: export
|
|
#include "absl/memory/memory.h"
|
|
|
|
namespace absl {
|
|
ABSL_NAMESPACE_BEGIN
|
|
namespace container_internal {
|
|
template <class K, class V>
|
|
struct FlatHashMapPolicy;
|
|
} // namespace container_internal
|
|
|
|
// -----------------------------------------------------------------------------
|
|
// absl::flat_hash_map
|
|
// -----------------------------------------------------------------------------
|
|
//
|
|
// An `absl::flat_hash_map<K, V>` is an unordered associative container which
|
|
// has been optimized for both speed and memory footprint in most common use
|
|
// cases. Its interface is similar to that of `std::unordered_map<K, V>` with
|
|
// the following notable differences:
|
|
//
|
|
// * Requires keys that are CopyConstructible
|
|
// * Requires values that are MoveConstructible
|
|
// * Supports heterogeneous lookup, through `find()`, `operator[]()` and
|
|
// `insert()`, provided that the map is provided a compatible heterogeneous
|
|
// hashing function and equality operator.
|
|
// * Invalidates any references and pointers to elements within the table after
|
|
// `rehash()`.
|
|
// * Contains a `capacity()` member function indicating the number of element
|
|
// slots (open, deleted, and empty) within the hash map.
|
|
// * Returns `void` from the `erase(iterator)` overload.
|
|
//
|
|
// By default, `flat_hash_map` uses the `absl::Hash` hashing framework.
|
|
// All fundamental and Abseil types that support the `absl::Hash` framework have
|
|
// a compatible equality operator for comparing insertions into `flat_hash_map`.
|
|
// If your type is not yet supported by the `absl::Hash` framework, see
|
|
// absl/hash/hash.h for information on extending Abseil hashing to user-defined
|
|
// types.
|
|
//
|
|
// NOTE: A `flat_hash_map` stores its value types directly inside its
|
|
// implementation array to avoid memory indirection. Because a `flat_hash_map`
|
|
// is designed to move data when rehashed, map values will not retain pointer
|
|
// stability. If you require pointer stability, or if your values are large,
|
|
// consider using `absl::flat_hash_map<Key, std::unique_ptr<Value>>` instead.
|
|
// If your types are not moveable or you require pointer stability for keys,
|
|
// consider `absl::node_hash_map`.
|
|
//
|
|
// Example:
|
|
//
|
|
// // Create a flat hash map of three strings (that map to strings)
|
|
// absl::flat_hash_map<std::string, std::string> ducks =
|
|
// {{"a", "huey"}, {"b", "dewey"}, {"c", "louie"}};
|
|
//
|
|
// // Insert a new element into the flat hash map
|
|
// ducks.insert({"d", "donald"});
|
|
//
|
|
// // Force a rehash of the flat hash map
|
|
// ducks.rehash(0);
|
|
//
|
|
// // Find the element with the key "b"
|
|
// std::string search_key = "b";
|
|
// auto result = ducks.find(search_key);
|
|
// if (result != ducks.end()) {
|
|
// std::cout << "Result: " << result->second << std::endl;
|
|
// }
|
|
template <class K, class V,
|
|
class Hash = absl::container_internal::hash_default_hash<K>,
|
|
class Eq = absl::container_internal::hash_default_eq<K>,
|
|
class Allocator = std::allocator<std::pair<const K, V>>>
|
|
class flat_hash_map : public absl::container_internal::raw_hash_map<
|
|
absl::container_internal::FlatHashMapPolicy<K, V>,
|
|
Hash, Eq, Allocator> {
|
|
using Base = typename flat_hash_map::raw_hash_map;
|
|
|
|
public:
|
|
// Constructors and Assignment Operators
|
|
//
|
|
// A flat_hash_map supports the same overload set as `std::unordered_map`
|
|
// for construction and assignment:
|
|
//
|
|
// * Default constructor
|
|
//
|
|
// // No allocation for the table's elements is made.
|
|
// absl::flat_hash_map<int, std::string> map1;
|
|
//
|
|
// * Initializer List constructor
|
|
//
|
|
// absl::flat_hash_map<int, std::string> map2 =
|
|
// {{1, "huey"}, {2, "dewey"}, {3, "louie"},};
|
|
//
|
|
// * Copy constructor
|
|
//
|
|
// absl::flat_hash_map<int, std::string> map3(map2);
|
|
//
|
|
// * Copy assignment operator
|
|
//
|
|
// // Hash functor and Comparator are copied as well
|
|
// absl::flat_hash_map<int, std::string> map4;
|
|
// map4 = map3;
|
|
//
|
|
// * Move constructor
|
|
//
|
|
// // Move is guaranteed efficient
|
|
// absl::flat_hash_map<int, std::string> map5(std::move(map4));
|
|
//
|
|
// * Move assignment operator
|
|
//
|
|
// // May be efficient if allocators are compatible
|
|
// absl::flat_hash_map<int, std::string> map6;
|
|
// map6 = std::move(map5);
|
|
//
|
|
// * Range constructor
|
|
//
|
|
// std::vector<std::pair<int, std::string>> v = {{1, "a"}, {2, "b"}};
|
|
// absl::flat_hash_map<int, std::string> map7(v.begin(), v.end());
|
|
flat_hash_map() {}
|
|
using Base::Base;
|
|
|
|
// flat_hash_map::begin()
|
|
//
|
|
// Returns an iterator to the beginning of the `flat_hash_map`.
|
|
using Base::begin;
|
|
|
|
// flat_hash_map::cbegin()
|
|
//
|
|
// Returns a const iterator to the beginning of the `flat_hash_map`.
|
|
using Base::cbegin;
|
|
|
|
// flat_hash_map::cend()
|
|
//
|
|
// Returns a const iterator to the end of the `flat_hash_map`.
|
|
using Base::cend;
|
|
|
|
// flat_hash_map::end()
|
|
//
|
|
// Returns an iterator to the end of the `flat_hash_map`.
|
|
using Base::end;
|
|
|
|
// flat_hash_map::capacity()
|
|
//
|
|
// Returns the number of element slots (assigned, deleted, and empty)
|
|
// available within the `flat_hash_map`.
|
|
//
|
|
// NOTE: this member function is particular to `absl::flat_hash_map` and is
|
|
// not provided in the `std::unordered_map` API.
|
|
using Base::capacity;
|
|
|
|
// flat_hash_map::empty()
|
|
//
|
|
// Returns whether or not the `flat_hash_map` is empty.
|
|
using Base::empty;
|
|
|
|
// flat_hash_map::max_size()
|
|
//
|
|
// Returns the largest theoretical possible number of elements within a
|
|
// `flat_hash_map` under current memory constraints. This value can be thought
|
|
// of the largest value of `std::distance(begin(), end())` for a
|
|
// `flat_hash_map<K, V>`.
|
|
using Base::max_size;
|
|
|
|
// flat_hash_map::size()
|
|
//
|
|
// Returns the number of elements currently within the `flat_hash_map`.
|
|
using Base::size;
|
|
|
|
// flat_hash_map::clear()
|
|
//
|
|
// Removes all elements from the `flat_hash_map`. Invalidates any references,
|
|
// pointers, or iterators referring to contained elements.
|
|
//
|
|
// NOTE: this operation may shrink the underlying buffer. To avoid shrinking
|
|
// the underlying buffer call `erase(begin(), end())`.
|
|
using Base::clear;
|
|
|
|
// flat_hash_map::erase()
|
|
//
|
|
// Erases elements within the `flat_hash_map`. Erasing does not trigger a
|
|
// rehash. Overloads are listed below.
|
|
//
|
|
// void erase(const_iterator pos):
|
|
//
|
|
// Erases the element at `position` of the `flat_hash_map`, returning
|
|
// `void`.
|
|
//
|
|
// NOTE: returning `void` in this case is different than that of STL
|
|
// containers in general and `std::unordered_map` in particular (which
|
|
// return an iterator to the element following the erased element). If that
|
|
// iterator is needed, simply post increment the iterator:
|
|
//
|
|
// map.erase(it++);
|
|
//
|
|
// iterator erase(const_iterator first, const_iterator last):
|
|
//
|
|
// Erases the elements in the open interval [`first`, `last`), returning an
|
|
// iterator pointing to `last`.
|
|
//
|
|
// size_type erase(const key_type& key):
|
|
//
|
|
// Erases the element with the matching key, if it exists.
|
|
using Base::erase;
|
|
|
|
// flat_hash_map::insert()
|
|
//
|
|
// Inserts an element of the specified value into the `flat_hash_map`,
|
|
// returning an iterator pointing to the newly inserted element, provided that
|
|
// an element with the given key does not already exist. If rehashing occurs
|
|
// due to the insertion, all iterators are invalidated. Overloads are listed
|
|
// below.
|
|
//
|
|
// std::pair<iterator,bool> insert(const init_type& value):
|
|
//
|
|
// Inserts a value into the `flat_hash_map`. Returns a pair consisting of an
|
|
// iterator to the inserted element (or to the element that prevented the
|
|
// insertion) and a bool denoting whether the insertion took place.
|
|
//
|
|
// std::pair<iterator,bool> insert(T&& value):
|
|
// std::pair<iterator,bool> insert(init_type&& value):
|
|
//
|
|
// Inserts a moveable value into the `flat_hash_map`. Returns a pair
|
|
// consisting of an iterator to the inserted element (or to the element that
|
|
// prevented the insertion) and a bool denoting whether the insertion took
|
|
// place.
|
|
//
|
|
// iterator insert(const_iterator hint, const init_type& value):
|
|
// iterator insert(const_iterator hint, T&& value):
|
|
// iterator insert(const_iterator hint, init_type&& value);
|
|
//
|
|
// Inserts a value, using the position of `hint` as a non-binding suggestion
|
|
// for where to begin the insertion search. Returns an iterator to the
|
|
// inserted element, or to the existing element that prevented the
|
|
// insertion.
|
|
//
|
|
// void insert(InputIterator first, InputIterator last):
|
|
//
|
|
// Inserts a range of values [`first`, `last`).
|
|
//
|
|
// NOTE: Although the STL does not specify which element may be inserted if
|
|
// multiple keys compare equivalently, for `flat_hash_map` we guarantee the
|
|
// first match is inserted.
|
|
//
|
|
// void insert(std::initializer_list<init_type> ilist):
|
|
//
|
|
// Inserts the elements within the initializer list `ilist`.
|
|
//
|
|
// NOTE: Although the STL does not specify which element may be inserted if
|
|
// multiple keys compare equivalently within the initializer list, for
|
|
// `flat_hash_map` we guarantee the first match is inserted.
|
|
using Base::insert;
|
|
|
|
// flat_hash_map::insert_or_assign()
|
|
//
|
|
// Inserts an element of the specified value into the `flat_hash_map` provided
|
|
// that a value with the given key does not already exist, or replaces it with
|
|
// the element value if a key for that value already exists, returning an
|
|
// iterator pointing to the newly inserted element. If rehashing occurs due
|
|
// to the insertion, all existing iterators are invalidated. Overloads are
|
|
// listed below.
|
|
//
|
|
// pair<iterator, bool> insert_or_assign(const init_type& k, T&& obj):
|
|
// pair<iterator, bool> insert_or_assign(init_type&& k, T&& obj):
|
|
//
|
|
// Inserts/Assigns (or moves) the element of the specified key into the
|
|
// `flat_hash_map`.
|
|
//
|
|
// iterator insert_or_assign(const_iterator hint,
|
|
// const init_type& k, T&& obj):
|
|
// iterator insert_or_assign(const_iterator hint, init_type&& k, T&& obj):
|
|
//
|
|
// Inserts/Assigns (or moves) the element of the specified key into the
|
|
// `flat_hash_map` using the position of `hint` as a non-binding suggestion
|
|
// for where to begin the insertion search.
|
|
using Base::insert_or_assign;
|
|
|
|
// flat_hash_map::emplace()
|
|
//
|
|
// Inserts an element of the specified value by constructing it in-place
|
|
// within the `flat_hash_map`, provided that no element with the given key
|
|
// already exists.
|
|
//
|
|
// The element may be constructed even if there already is an element with the
|
|
// key in the container, in which case the newly constructed element will be
|
|
// destroyed immediately. Prefer `try_emplace()` unless your key is not
|
|
// copyable or moveable.
|
|
//
|
|
// If rehashing occurs due to the insertion, all iterators are invalidated.
|
|
using Base::emplace;
|
|
|
|
// flat_hash_map::emplace_hint()
|
|
//
|
|
// Inserts an element of the specified value by constructing it in-place
|
|
// within the `flat_hash_map`, using the position of `hint` as a non-binding
|
|
// suggestion for where to begin the insertion search, and only inserts
|
|
// provided that no element with the given key already exists.
|
|
//
|
|
// The element may be constructed even if there already is an element with the
|
|
// key in the container, in which case the newly constructed element will be
|
|
// destroyed immediately. Prefer `try_emplace()` unless your key is not
|
|
// copyable or moveable.
|
|
//
|
|
// If rehashing occurs due to the insertion, all iterators are invalidated.
|
|
using Base::emplace_hint;
|
|
|
|
// flat_hash_map::try_emplace()
|
|
//
|
|
// Inserts an element of the specified value by constructing it in-place
|
|
// within the `flat_hash_map`, provided that no element with the given key
|
|
// already exists. Unlike `emplace()`, if an element with the given key
|
|
// already exists, we guarantee that no element is constructed.
|
|
//
|
|
// If rehashing occurs due to the insertion, all iterators are invalidated.
|
|
// Overloads are listed below.
|
|
//
|
|
// pair<iterator, bool> try_emplace(const key_type& k, Args&&... args):
|
|
// pair<iterator, bool> try_emplace(key_type&& k, Args&&... args):
|
|
//
|
|
// Inserts (via copy or move) the element of the specified key into the
|
|
// `flat_hash_map`.
|
|
//
|
|
// iterator try_emplace(const_iterator hint,
|
|
// const init_type& k, Args&&... args):
|
|
// iterator try_emplace(const_iterator hint, init_type&& k, Args&&... args):
|
|
//
|
|
// Inserts (via copy or move) the element of the specified key into the
|
|
// `flat_hash_map` using the position of `hint` as a non-binding suggestion
|
|
// for where to begin the insertion search.
|
|
//
|
|
// All `try_emplace()` overloads make the same guarantees regarding rvalue
|
|
// arguments as `std::unordered_map::try_emplace()`, namely that these
|
|
// functions will not move from rvalue arguments if insertions do not happen.
|
|
using Base::try_emplace;
|
|
|
|
// flat_hash_map::extract()
|
|
//
|
|
// Extracts the indicated element, erasing it in the process, and returns it
|
|
// as a C++17-compatible node handle. Overloads are listed below.
|
|
//
|
|
// node_type extract(const_iterator position):
|
|
//
|
|
// Extracts the key,value pair of the element at the indicated position and
|
|
// returns a node handle owning that extracted data.
|
|
//
|
|
// node_type extract(const key_type& x):
|
|
//
|
|
// Extracts the key,value pair of the element with a key matching the passed
|
|
// key value and returns a node handle owning that extracted data. If the
|
|
// `flat_hash_map` does not contain an element with a matching key, this
|
|
// function returns an empty node handle.
|
|
using Base::extract;
|
|
|
|
// flat_hash_map::merge()
|
|
//
|
|
// Extracts elements from a given `source` flat hash map into this
|
|
// `flat_hash_map`. If the destination `flat_hash_map` already contains an
|
|
// element with an equivalent key, that element is not extracted.
|
|
using Base::merge;
|
|
|
|
// flat_hash_map::swap(flat_hash_map& other)
|
|
//
|
|
// Exchanges the contents of this `flat_hash_map` with those of the `other`
|
|
// flat hash map, avoiding invocation of any move, copy, or swap operations on
|
|
// individual elements.
|
|
//
|
|
// All iterators and references on the `flat_hash_map` remain valid, excepting
|
|
// for the past-the-end iterator, which is invalidated.
|
|
//
|
|
// `swap()` requires that the flat hash map's hashing and key equivalence
|
|
// functions be Swappable, and are exchanged using unqualified calls to
|
|
// non-member `swap()`. If the map's allocator has
|
|
// `std::allocator_traits<allocator_type>::propagate_on_container_swap::value`
|
|
// set to `true`, the allocators are also exchanged using an unqualified call
|
|
// to non-member `swap()`; otherwise, the allocators are not swapped.
|
|
using Base::swap;
|
|
|
|
// flat_hash_map::rehash(count)
|
|
//
|
|
// Rehashes the `flat_hash_map`, setting the number of slots to be at least
|
|
// the passed value. If the new number of slots increases the load factor more
|
|
// than the current maximum load factor
|
|
// (`count` < `size()` / `max_load_factor()`), then the new number of slots
|
|
// will be at least `size()` / `max_load_factor()`.
|
|
//
|
|
// To force a rehash, pass rehash(0).
|
|
//
|
|
// NOTE: unlike behavior in `std::unordered_map`, references are also
|
|
// invalidated upon a `rehash()`.
|
|
using Base::rehash;
|
|
|
|
// flat_hash_map::reserve(count)
|
|
//
|
|
// Sets the number of slots in the `flat_hash_map` to the number needed to
|
|
// accommodate at least `count` total elements without exceeding the current
|
|
// maximum load factor, and may rehash the container if needed.
|
|
using Base::reserve;
|
|
|
|
// flat_hash_map::at()
|
|
//
|
|
// Returns a reference to the mapped value of the element with key equivalent
|
|
// to the passed key.
|
|
using Base::at;
|
|
|
|
// flat_hash_map::contains()
|
|
//
|
|
// Determines whether an element with a key comparing equal to the given `key`
|
|
// exists within the `flat_hash_map`, returning `true` if so or `false`
|
|
// otherwise.
|
|
using Base::contains;
|
|
|
|
// flat_hash_map::count(const Key& key) const
|
|
//
|
|
// Returns the number of elements with a key comparing equal to the given
|
|
// `key` within the `flat_hash_map`. note that this function will return
|
|
// either `1` or `0` since duplicate keys are not allowed within a
|
|
// `flat_hash_map`.
|
|
using Base::count;
|
|
|
|
// flat_hash_map::equal_range()
|
|
//
|
|
// Returns a closed range [first, last], defined by a `std::pair` of two
|
|
// iterators, containing all elements with the passed key in the
|
|
// `flat_hash_map`.
|
|
using Base::equal_range;
|
|
|
|
// flat_hash_map::find()
|
|
//
|
|
// Finds an element with the passed `key` within the `flat_hash_map`.
|
|
using Base::find;
|
|
|
|
// flat_hash_map::operator[]()
|
|
//
|
|
// Returns a reference to the value mapped to the passed key within the
|
|
// `flat_hash_map`, performing an `insert()` if the key does not already
|
|
// exist.
|
|
//
|
|
// If an insertion occurs and results in a rehashing of the container, all
|
|
// iterators are invalidated. Otherwise iterators are not affected and
|
|
// references are not invalidated. Overloads are listed below.
|
|
//
|
|
// T& operator[](const Key& key):
|
|
//
|
|
// Inserts an init_type object constructed in-place if the element with the
|
|
// given key does not exist.
|
|
//
|
|
// T& operator[](Key&& key):
|
|
//
|
|
// Inserts an init_type object constructed in-place provided that an element
|
|
// with the given key does not exist.
|
|
using Base::operator[];
|
|
|
|
// flat_hash_map::bucket_count()
|
|
//
|
|
// Returns the number of "buckets" within the `flat_hash_map`. Note that
|
|
// because a flat hash map contains all elements within its internal storage,
|
|
// this value simply equals the current capacity of the `flat_hash_map`.
|
|
using Base::bucket_count;
|
|
|
|
// flat_hash_map::load_factor()
|
|
//
|
|
// Returns the current load factor of the `flat_hash_map` (the average number
|
|
// of slots occupied with a value within the hash map).
|
|
using Base::load_factor;
|
|
|
|
// flat_hash_map::max_load_factor()
|
|
//
|
|
// Manages the maximum load factor of the `flat_hash_map`. Overloads are
|
|
// listed below.
|
|
//
|
|
// float flat_hash_map::max_load_factor()
|
|
//
|
|
// Returns the current maximum load factor of the `flat_hash_map`.
|
|
//
|
|
// void flat_hash_map::max_load_factor(float ml)
|
|
//
|
|
// Sets the maximum load factor of the `flat_hash_map` to the passed value.
|
|
//
|
|
// NOTE: This overload is provided only for API compatibility with the STL;
|
|
// `flat_hash_map` will ignore any set load factor and manage its rehashing
|
|
// internally as an implementation detail.
|
|
using Base::max_load_factor;
|
|
|
|
// flat_hash_map::get_allocator()
|
|
//
|
|
// Returns the allocator function associated with this `flat_hash_map`.
|
|
using Base::get_allocator;
|
|
|
|
// flat_hash_map::hash_function()
|
|
//
|
|
// Returns the hashing function used to hash the keys within this
|
|
// `flat_hash_map`.
|
|
using Base::hash_function;
|
|
|
|
// flat_hash_map::key_eq()
|
|
//
|
|
// Returns the function used for comparing keys equality.
|
|
using Base::key_eq;
|
|
};
|
|
|
|
// erase_if(flat_hash_map<>, Pred)
|
|
//
|
|
// Erases all elements that satisfy the predicate `pred` from the container `c`.
|
|
template <typename K, typename V, typename H, typename E, typename A,
|
|
typename Predicate>
|
|
void erase_if(flat_hash_map<K, V, H, E, A>& c, Predicate pred) {
|
|
container_internal::EraseIf(pred, &c);
|
|
}
|
|
|
|
namespace container_internal {
|
|
|
|
template <class K, class V>
|
|
struct FlatHashMapPolicy {
|
|
using slot_policy = container_internal::map_slot_policy<K, V>;
|
|
using slot_type = typename slot_policy::slot_type;
|
|
using key_type = K;
|
|
using mapped_type = V;
|
|
using init_type = std::pair</*non const*/ key_type, mapped_type>;
|
|
|
|
template <class Allocator, class... Args>
|
|
static void construct(Allocator* alloc, slot_type* slot, Args&&... args) {
|
|
slot_policy::construct(alloc, slot, std::forward<Args>(args)...);
|
|
}
|
|
|
|
template <class Allocator>
|
|
static void destroy(Allocator* alloc, slot_type* slot) {
|
|
slot_policy::destroy(alloc, slot);
|
|
}
|
|
|
|
template <class Allocator>
|
|
static void transfer(Allocator* alloc, slot_type* new_slot,
|
|
slot_type* old_slot) {
|
|
slot_policy::transfer(alloc, new_slot, old_slot);
|
|
}
|
|
|
|
template <class F, class... Args>
|
|
static decltype(absl::container_internal::DecomposePair(
|
|
std::declval<F>(), std::declval<Args>()...))
|
|
apply(F&& f, Args&&... args) {
|
|
return absl::container_internal::DecomposePair(std::forward<F>(f),
|
|
std::forward<Args>(args)...);
|
|
}
|
|
|
|
static size_t space_used(const slot_type*) { return 0; }
|
|
|
|
static std::pair<const K, V>& element(slot_type* slot) { return slot->value; }
|
|
|
|
static V& value(std::pair<const K, V>* kv) { return kv->second; }
|
|
static const V& value(const std::pair<const K, V>* kv) { return kv->second; }
|
|
};
|
|
|
|
} // namespace container_internal
|
|
|
|
namespace container_algorithm_internal {
|
|
|
|
// Specialization of trait in absl/algorithm/container.h
|
|
template <class Key, class T, class Hash, class KeyEqual, class Allocator>
|
|
struct IsUnorderedContainer<
|
|
absl::flat_hash_map<Key, T, Hash, KeyEqual, Allocator>> : std::true_type {};
|
|
|
|
} // namespace container_algorithm_internal
|
|
|
|
ABSL_NAMESPACE_END
|
|
} // namespace absl
|
|
|
|
#endif // ABSL_CONTAINER_FLAT_HASH_MAP_H_
|