Boost Unordered Translation (zh_Hans)/Doc / Modules / Root / Pages / Reference / Concurrent Flat Map (adoc) — English @ Boost-Weblate: Deletes all preexisting elements of a `concurrent_flat

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Deletes all preexisting elements of a `concurrent_flat_map` `x` and inserts from an archive (XML archive) `ar` restored copies of the elements of the original `concurrent_flat_map` `other` saved to the storage read by `ar`.

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	Key	English	Actions
	:1776	---
		Swap
		```c++ template<class Key, class T, class Hash, class Pred, class Alloc> void swap(concurrent_flat_map<Key, T, Hash, Pred, Alloc>& x, concurrent_flat_map<Key, T, Hash, Pred, Alloc>& y) noexcept(noexcept(x.swap(y))); ```
	:1786	Equivalent to [listing,subs="+macros,+quotes"]
	:1792	---
	:1794	erase_if
		```c++ template<class K, class T, class H, class P, class A, class Predicate> typename concurrent_flat_map<K, T, H, P, A>::size_type erase_if(concurrent_flat_map<K, T, H, P, A>& c, Predicate pred); ```
	:1801	Equivalent to [listing,subs="+macros,+quotes"]
		Serialization
		``concurrent_flat_map``s can be archived/retrieved by means of link:../../../../../serialization/index.html[Boost.Serialization^] using the API provided by this library. Both regular and XML archives are supported.
		Saving an concurrent_flat_map to an archive
		Saves all the elements of a `concurrent_flat_map` `x` to an archive (XML archive) `ar`.
		Requires:;; `std::remove_const<key_type>::type` and `std::remove_const<mapped_type>::type` are serializable (XML serializable), and they do support Boost.Serialization `save_construct_data`/`load_construct_data` protocol (automatically suported by https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^] types). Concurrency:;; Blocking on `x`.
	:1825	---
		Loading an concurrent_flat_map from an archive
		Deletes all preexisting elements of a `concurrent_flat_map` `x` and inserts from an archive (XML archive) `ar` restored copies of the elements of the original `concurrent_flat_map` `other` saved to the storage read by `ar`.
		Requires:;; `x.key_equal()` is functionally equivalent to `other.key_equal()`. Concurrency:;; Blocking on `x`.

	English	Actions
	Description
	Template Parameters
	_Key_
	`std::pair<const Key, T>` must be https://en.cppreference.com/w/cpp/named_req/EmplaceConstructible[EmplaceConstructible^] into the table from any `std::pair` object convertible to it, and it also must be https://en.cppreference.com/w/cpp/named_req/Erasable[Erasable^] from the table.
	_T_
	_Hash_
	A unary function object type that acts a hash function for a `Key`. It takes a single argument of type `Key` and returns a value of type `std::size_t`.
	_Pred_
	A binary function object that induces an equivalence relation on values of type `Key`. It takes two arguments of type `Key` and returns a value of type `bool`.
	_Allocator_
	An allocator whose value type is the same as the table's value type.
	Allocators using https://en.cppreference.com/w/cpp/named_req/Allocator#Fancy_pointers[fancy pointers] are supported.
	The elements of the table are held into an internal _bucket array_. An element is inserted into a bucket determined by its hash code, but if the bucket is already occupied (a _collision_), an available one in the vicinity of the original position is used.
	operator
	```c++ template<class Key, class T, class Hash, class Pred, class Alloc> bool operator==(const concurrent_flat_map<Key, T, Hash, Pred, Alloc>& x, const concurrent_flat_map<Key, T, Hash, Pred, Alloc>& y); ```
	Returns `true` if `x.size() == y.size()` and for every element in `x`, there is an element in `y` with the same key, with an equal value (using `operator==` to compare the value types).
	operator!
	```c++ template<class Key, class T, class Hash, class Pred, class Alloc> bool operator!=(const concurrent_flat_map<Key, T, Hash, Pred, Alloc>& x, const concurrent_flat_map<Key, T, Hash, Pred, Alloc>& y); ```
	Returns `false` if `x.size() == y.size()` and for every element in `x`, there is an element in `y` with the same key, with an equal value (using `operator==` to compare the value types).
	Swap
	```c++ template<class Key, class T, class Hash, class Pred, class Alloc> void swap(concurrent_flat_map<Key, T, Hash, Pred, Alloc>& x, concurrent_flat_map<Key, T, Hash, Pred, Alloc>& y) noexcept(noexcept(x.swap(y))); ```
	```c++ template<class K, class T, class H, class P, class A, class Predicate> typename concurrent_flat_map<K, T, H, P, A>::size_type erase_if(concurrent_flat_map<K, T, H, P, A>& c, Predicate pred); ```
	Serialization
	``concurrent_flat_map``s can be archived/retrieved by means of link:../../../../../serialization/index.html[Boost.Serialization^] using the API provided by this library. Both regular and XML archives are supported.
	Saving an concurrent_flat_map to an archive
	Saves all the elements of a `concurrent_flat_map` `x` to an archive (XML archive) `ar`.
	Requires:;; `std::remove_const<key_type>::type` and `std::remove_const<mapped_type>::type` are serializable (XML serializable), and they do support Boost.Serialization `save_construct_data`/`load_construct_data` protocol (automatically suported by https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^] types). Concurrency:;; Blocking on `x`.
	Loading an concurrent_flat_map from an archive
	Deletes all preexisting elements of a `concurrent_flat_map` `x` and inserts from an archive (XML archive) `ar` restored copies of the elements of the original `concurrent_flat_map` `other` saved to the storage read by `ar`.
	Requires:;; `x.key_equal()` is functionally equivalent to `other.key_equal()`. Concurrency:;; Blocking on `x`.

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English 223 characters editedCurrent translationState: Read-only

06/05/2026

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read-only, safe-html, strict-same

Unit identifier

46486

Source string location

:1829

String age

06/05/2026

Last updated

06/05/2026

Source string age

06/05/2026

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doc/modules/ROOT/pages/reference/concurrent_flat_map.adoc, string 459

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