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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`.
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```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); ```
```c++ template<class key,="" class="" t,="" hash,="" pred,="" alloc=""> bool operator!=(const concurrent_flat_map<key, t,="" hash,="" pred,="" alloc="">&amp; x, const concurrent_flat_map<key, t,="" hash,="" pred,="" alloc="">&amp; y); ```</key,></key,></class>
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).
若`x.size() == y.size()`，且`x`中每个元素在`y`中都存在键相同、值相等（使用`operator==`比较值类型）的元素，则返回`false`。
:1773
Concurrency:;; Blocking on `x` and `y`. Notes:;; Behavior is undefined if the two tables don't have equivalent equality predicates.
并发：阻塞`x`和`y`。
说明：若两个容器的相等判定谓词不一致，则行为未定义。
:1776
---
---
Swap
交换
```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 key,="" class="" t,="" hash,="" pred,="" alloc=""> void swap(concurrent_flat_map<key, t,="" hash,="" pred,="" alloc="">&amp; x, concurrent_flat_map<key, t,="" hash,="" pred,="" alloc="">&amp; y) noexcept(noexcept(x.swap(y))); ```</key,></key,></class>
:1786
Equivalent to [listing,subs="+macros,+quotes"]
等价于 [listing,subs="+macros,+quotes"]
:1792
---
---
:1794
erase_if
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); ```
```c++ template<class k,="" class="" t,="" h,="" p,="" a,="" predicate=""> typename concurrent_flat_map<k, t,="" h,="" p,="" a="">::size_type erase_if(concurrent_flat_map<k, t,="" h,="" p,="" a="">&amp; c, Predicate pred); ```</k,></k,></class>
:1801
Equivalent to [listing,subs="+macros,+quotes"]
等价于 [listing,subs="+macros,+quotes"]
Serialization
序列化
``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.
`concurrent++_++flat++_++map` 可通过本组件库提供的 API，借助 link:../../../../../serialization/index.html[Boost.Serialization] 进行归档/检索。支持常规归档与 XML 归档两种格式。
Saving an concurrent_flat_map to an archive
将concurrent++_++flat++_++map保存到归档
Saves all the elements of a `concurrent_flat_map` `x` to an archive (XML archive) `ar`.
将 `concurrent++_++flat++_++map` 容器 `x` 的所有元素保存到归档（XML归档） `ar` 中。
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`.
要求：`std::remove_const<key_type>::type` 和 `std::remove_const<mapped_type>::type` 必须是可序列化的（支持 XML 序列化），并且它们支持 Boost.Serialization 的 `save_construct_data` / `load_construct_data` 协议（https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[可默认构造^] 类型自动支持该协议）。并发：阻塞 `x`。</mapped_type></key_type>
:1825
---
---
Loading an concurrent_flat_map from an archive
从归档加载concurrent++_++flat++_++map
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`.
删除 `concurrent++_++flat++_++map` 容器 `x` 中所有已存在的元素，并从归档（XML 归档） `ar` 中插入原始 `concurrent++_++flat++_++map` 容器 `other` 的元素副本，这些副本是从 `ar` 所读取的存储中恢复的。
Requires:;; `x.key_equal()` is functionally equivalent to `other.key_equal()`. Concurrency:;; Blocking on `x`.
要求;; `x.key++_++equal()` 需要在功能上等价于 `other.key++_++equal()` 。 并发性;; 阻塞于 `x` 。
English Chinese (Simplified Han script) Actions
Move Constructor from unordered_flat_map
从 unordered_flat_map 的移动构造函数
emplace
原地构造
Returns:;; The number of elements erased. Throws:;; Only throws an exception if it is thrown by `f`.
返回值：被删除的元素数量。
异常：仅当函数 `f` 抛出异常时才会抛出异常。
Similar to `rehash`, this function can be used to grow or shrink the number of buckets in the table.
与 `rehash` 功能类似，该函数可用于**增大或缩小**容器的桶数量。
get_stats
get_stats
```c++ stats get_stats() const; ```
```c++ stats get_stats() const; ```
Returns:;; A statistical description of the insertion and lookup operations performed by the table so far. Notes:;; Only available if xref:reference/stats.adoc#stats[statistics calculation] is xref:concurrent_flat_map_boost_unordered_enable_stats[enabled].
返回值：容器截至目前执行的插入与查找操作的统计描述信息。
说明：仅当**启用统计计算**时，该函数才可用。
Deduction Guides
推导指引
A deduction guide will not participate in overload resolution if any of the following are true:
满足以下任一条件时，推导指引不参与重载决议：
- It has an `InputIterator` template parameter and a type that does not qualify as an input iterator is deduced for that parameter. - It has an `Allocator` template parameter and a type that does not qualify as an allocator is deduced for that parameter. - It has a `Hash` template parameter and an integral type or a type that qualifies as an allocator is deduced for that parameter. - It has a `Pred` template parameter and a type that qualifies as an allocator is deduced for that parameter.
- 该推导指引包含 `InputIterator` 模板参数，且为此参数推导出的类型不符合输入迭代器的要求。 - 该推导指引包含 `Allocator` 模板参数，且为该参数推导出的类型不符合分配器要求。 - 该推导指引包含 `Hash` 模板参数，且为该参数推导出的类型为整型或符合分配器要求。 - 该推导指引包含 `Pred` 模板参数，且为该参数推导出的类型符合分配器要求。
Requires:;; `x.key_equal()` is functionally equivalent to `other.key_equal()`. Concurrency:;; Blocking on `x`.
要求;; `x.key++_++equal()` 需要在功能上等价于 `other.key++_++equal()` 。 并发性;; 阻塞于 `x` 。
_T_
_T_
Constructors
构造函数
Throws:;; The function has no effect if an exception is thrown, unless it is thrown by the table's hash function or comparison function. Concurrency:;; Blocking on `*this`. ---
异常：若抛出异常，函数无任何效果（由容器的哈希函数或比较函数抛出的异常除外）。
并发：阻塞当前对象 `*this`。
```c++ void reserve(size_type n); ```
```c++ void reserve(size_type n); ```
Equivalent to `a.rehash(ceil(n / a.max_load_factor()))`.
等价于 `a.rehash(ceil(n / a.max_load_factor()))`。
```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); ```
```c++ template<class key,="" class="" t,="" hash,="" pred,="" alloc=""> bool operator==(const concurrent_flat_map<key, t,="" hash,="" pred,="" alloc="">&amp; x, const concurrent_flat_map<key, t,="" hash,="" pred,="" alloc="">&amp; y); ```</key,></key,></class>
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).
若 `x.size() == y.size()`，且对于 `x` 中的每个元素，`y` 中均存在拥有相同键、值相等（使用 `operator==` 比较值类型）的元素，则返回 `true`。
operator!
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); ```
```c++ template<class key,="" class="" t,="" hash,="" pred,="" alloc=""> bool operator!=(const concurrent_flat_map<key, t,="" hash,="" pred,="" alloc="">&amp; x, const concurrent_flat_map<key, t,="" hash,="" pred,="" alloc="">&amp; y); ```</key,></key,></class>
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).
若`x.size() == y.size()`，且`x`中每个元素在`y`中都存在键相同、值相等（使用`operator==`比较值类型）的元素，则返回`false`。
Swap
交换
```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 key,="" class="" t,="" hash,="" pred,="" alloc=""> void swap(concurrent_flat_map<key, t,="" hash,="" pred,="" alloc="">&amp; x, concurrent_flat_map<key, t,="" hash,="" pred,="" alloc="">&amp; y) noexcept(noexcept(x.swap(y))); ```</key,></key,></class>
```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); ```
```c++ template<class k,="" class="" t,="" h,="" p,="" a,="" predicate=""> typename concurrent_flat_map<k, t,="" h,="" p,="" a="">::size_type erase_if(concurrent_flat_map<k, t,="" h,="" p,="" a="">&amp; c, Predicate pred); ```</k,></k,></class>
Serialization
序列化
``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.
`concurrent++_++flat++_++map` 可通过本组件库提供的 API，借助 link:../../../../../serialization/index.html[Boost.Serialization] 进行归档/检索。支持常规归档与 XML 归档两种格式。
Saving an concurrent_flat_map to an archive
将concurrent++_++flat++_++map保存到归档
Saves all the elements of a `concurrent_flat_map` `x` to an archive (XML archive) `ar`.
将 `concurrent++_++flat++_++map` 容器 `x` 的所有元素保存到归档（XML归档） `ar` 中。
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`.
要求：`std::remove_const<key_type>::type` 和 `std::remove_const<mapped_type>::type` 必须是可序列化的（支持 XML 序列化），并且它们支持 Boost.Serialization 的 `save_construct_data` / `load_construct_data` 协议（https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[可默认构造^] 类型自动支持该协议）。并发：阻塞 `x`。</mapped_type></key_type>
Loading an concurrent_flat_map from an archive
从归档加载concurrent++_++flat++_++map

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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`.
Requires:;; 要求：`std::remove_const<key_type>::type` and和 `std::remove_const<mapped_type>::type` are serializable (XML serializable), and they do support必须是可序列化的（支持 XML 序列化），并且它们支持 Boost.Serialization 的 `save_construct_data`/ / `load_construct_data` protocol (automatically suported by 协议（https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^] types). Concurrency:;; Blocking on `x`.可默认构造^] 类型自动支持该协议）。并发：阻塞 `x`。</mapped_type></key_type>
06/05/2026
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String added in the repository
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`.
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`.
06/05/2026
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safe-html, strict-same
Unit identifier
54153
Source string location
:1818
String age
06/05/2026
Last updated
06/06/2026
Source string age
06/05/2026
Translation file AsciiDoc file
doc/modules/ROOT/pages/reference/concurrent_flat_map_zh_Hans.adoc, string 456