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:335	---	---
	Concurrency Requirements and Guarantees	并发要求与保证
	Concurrent invocations of `operator()` on the same const instance of `Hash` or `Pred` are required to not introduce data races. For `Alloc` being either `Allocator` or any allocator type rebound from `Allocator`, concurrent invocations of the following operations on the same instance `al` of `Alloc` are required to not introduce data races:	要求对同一 `Hash` 或 `Pred` 常量实例并发调用 `operator()` 时不得引入数据竞争。对于 `Alloc` （即 `Allocator` 或其重绑定后的任意分配器类型），在同一实例 `al` 上并发调用以下操作时不得引入数据竞争：
	Copy construction from `al` of an allocator rebound from `Alloc`	从 `al` 复制构造重新绑定的分配器
	`std::allocator_traits<Alloc>::allocate`	`std::allocator++_++traits++<++Alloc++>++::allocate`
	`std::allocator_traits<Alloc>::deallocate`	`std::allocator++_++traits++<++Alloc++>++::deallocate`
	`std::allocator_traits<Alloc>::construct`	`std::allocator++_++traits++<++Alloc++>++::construct`
	`std::allocator_traits<Alloc>::destroy`	`std::allocator++_++traits++<++Alloc++>++::destroy`
	In general, these requirements on `Hash`, `Pred` and `Allocator` are met if these types are not stateful or if the operations only involve constant access to internal data members.	通常而言，若 `Hash` 、 `Pred` 和 `Allocator` 这些类型不包含状态，或其操作仅涉及对内部数据成员的常量访问，即可满足上述要求。
	With the exception of destruction, concurrent invocations of any operation on the same instance of a `concurrent_node_set` do not introduce data races — that is, they are thread-safe.	除析构操作外，对同一 `concurrent++_++node++_++set` 实例并发调用任何操作均不会引入数据竞争——即这些操作是线程安全的。
	If an operation op is explicitly designated as _blocking on_ `x`, where `x` is an instance of a `boost::concurrent_node_set`, prior blocking operations on `x` synchronize with op. So, blocking operations on the same `concurrent_node_set` execute sequentially in a multithreaded scenario.	若某个操作 op 被显式指定为__阻塞于__ `x` （其中 `x` 为 `boost::concurrent++_++node++_++set` 实例），则先前对 `x` 的阻塞操作将与 op 同步。因此，在多线程场景中，对同一 `concurrent++_++node++_++set` 的阻塞操作将按顺序执行。
	An operation is said to be _blocking on rehashing of_ ``__x__`` if it blocks on `x` only when an internal rehashing is issued.	若某个操作仅在触发内部重哈希时才会阻塞于 _`x`_，则称该操作__阻塞于 _`x`_ 的重哈希过程__。
	When executed internally by a `boost::concurrent_node_set`, the following operations by a user-provided visitation function on the element passed do not introduce data races:	当由 `boost::concurrent++_++node++_++set` 内部执行时，用户提供的访问函数对传递的元素执行以下操作不会引入数据竞争：
	Read access to the element.	对元素的读取访问。
	Non-mutable modification of the element.	对元素的非可变修改。
	Mutable modification of the element:	对元素的可变修改：
	Within a container function accepting two visitation functions, always for the first function. Within a non-const container function whose name does not contain `cvisit`, for the last (or only) visitation function.	在容器接受两个访问函数的操作中，此条件始终适用于第一个访问函数。在名称不包含 `cvisit` 的非常量容器函数中，此条件适用于最后一个（或唯一一个）访问函数。
	Any `boost::concurrent_node_set operation` that inserts or modifies an element `e` synchronizes with the internal invocation of a visitation function on `e`.	任何插入或修改元素 `e` 的 `boost::concurrent++_++node++_++set` 操作均与在 `e` 上内部调用的访问函数同步。
	Visitation functions executed by a `boost::concurrent_node_set` `x` are not allowed to invoke any operation on `x`; invoking operations on a different `boost::concurrent_node_set` instance `y` is allowed only if concurrent outstanding operations on `y` do not access `x` directly or indirectly.	由 `boost::concurrent++_++node++_++set` `x` 执行的访问函数不得调用 `x` 上的任何操作；仅当对另一 `boost::concurrent++_++node++_++set` 实例 `y` 的并发未完成操作不直接或间接访问 `x` 时，才允许调用 `y` 上的操作。
:379	---	---
	Configuration Macros	配置宏
	`BOOST_UNORDERED_DISABLE_REENTRANCY_CHECK`	`BOOST++_++UNORDERED++_++DISABLE++_++REENTRANCY++_++CHECK`
	In debug builds (more precisely, when link:../../../../../assert/doc/html/assert.html#boost_assert_is_void[`BOOST_ASSERT_IS_VOID`^] is not defined), __container reentrancies__ (illegaly invoking an operation on `m` from within a function visiting elements of `m`) are detected and signalled through `BOOST_ASSERT_MSG`. When run-time speed is a concern, the feature can be disabled by globally defining this macro.	在调试版本中（更准确地说，当未定义 link:../../../../../assert/doc/html/assert.html#boost_assert_is_void[`BOOST++_++ASSERT++_++IS++_++VOID`] 时），系统会检测__容器重入__行为（即在访问 `m` 元素的函数内部非法调用 `m` 上的操作），并通过 `BOOST++_++ASSERT++_++MSG` 发出信号。若需关注运行时速度，可通过全局定义此宏来禁用该功能。
:392	---	---
	`BOOST_UNORDERED_ENABLE_STATS`	`BOOST++_++UNORDERED++_++ENABLE++_++STATS`
	Globally define this macro to enable xref:reference/stats.adoc#stats[statistics calculation] for the table. Note that this option decreases the overall performance of many operations.	全局定义此宏以启用容器的 xref:reference/stats.adoc#stats[统计计算] 功能。请注意，此选项会降低多数操作的总体性能。
:399	---	---
	Typedefs	类型定义
	A class for holding extracted table elements, modelling https://en.cppreference.com/w/cpp/container/node_handle[NodeHandle].	用于保存提取的表元素的类，建模为 https://en.cppreference.com/w/cpp/container/node_handle[NodeHandle] 。
:411	---	---
	A specialization of an internal class template:	内部类模板的特化：

	English	Chinese (Simplified Han script)	Actions
	Returns:;; The table's key equality predicate.	返回值：;; 表的键相等性断言。
	Bucket Interface	桶接口
	bucket_count	bucket_count
	Returns:;; `static_cast<float>(size())/static_cast<float>(bucket_count())`, or `0` if `bucket_count() == 0`.	返回值：;; `static_cast<float>(size())/static_cast<float>(bucket_count())`，若 `bucket_count() == 0` 则返回 `0`。</float></float>
	Set max_load_factor	设置最大负载因子
	```c++ void max_load_factor(float z); ```	```c++ void max_load_factor(float z); ```
	Effects:;; Does nothing, as the user is not allowed to change this parameter. Kept for compatibility with `boost::unordered_set`.	效果：;; 不执行任何操作，因为不允许用户修改此参数。保留该函数是为了与 `boost::unordered_set` 保持兼容。
	When `size() == 0`, `rehash(0)` will deallocate the underlying buckets array.	效果：;; 当 `size() == 0` 时，调用 `rehash(0)` 会释放底层桶数组的内存。
	A deduction guide will not participate in overload resolution if any of the following are true:	如果以下任何一条件为真，则推导指引将不参与重载决议：
	A `size_type` parameter type in a deduction guide refers to the `size_type` member type of the container type deduced by the deduction guide. Its default value coincides with the default value of the constructor selected.	推导指引中的 `size++_++type` 参数类型，指向由该推导指引所推导容器类型的 `size++_++type` 成员类型。其默认值与所选构造函数的默认值一致。
	```c++ template<class Key, class Hash, class Pred, class Alloc> bool operator==(const concurrent_node_set<Key, Hash, Pred, Alloc>& x, const concurrent_node_set<Key, Hash, Pred, Alloc>& y); ```	```c++ template<class key,="" class="" hash,="" pred,="" alloc=""> bool operator==(const concurrent_node_set<key, hash,="" pred,="" alloc="">& x, const concurrent_node_set<key, hash,="" pred,="" alloc="">& y); ```</key,></key,></class>
	```c++ template<class Key, class Hash, class Pred, class Alloc> void swap(concurrent_node_set<Key, Hash, Pred, Alloc>& x, concurrent_node_set<Key, Hash, Pred, Alloc>& y) noexcept(noexcept(x.swap(y))); ```	```c++ template<class key,="" class="" hash,="" pred,="" alloc=""> void swap(concurrent_node_set<key, hash,="" pred,="" alloc="">& x, concurrent_node_set<key, hash,="" pred,="" alloc="">& y) noexcept(noexcept(x.swap(y))); ```</key,></key,></class>
	```c++ template<class K, class H, class P, class A, class Predicate> typename concurrent_node_set<K, H, P, A>::size_type erase_if(concurrent_node_set<K, H, P, A>& c, Predicate pred); ```	```c++ template<class k,="" class="" h,="" p,="" a,="" predicate=""> typename concurrent_node_set<k, h,="" p,="" a="">::size_type erase_if(concurrent_node_set<k, h,="" p,="" a="">& c, Predicate pred); ```</k,></k,></class>
	When executed internally by a `boost::concurrent_node_set`, the following operations by a user-provided visitation function on the element passed do not introduce data races:	当由 `boost::concurrent++_++node++_++set` 内部执行时，用户提供的访问函数对传递的元素执行以下操作不会引入数据竞争：
	Non-mutable modification of the element.	对元素的非可变修改。
	Mutable modification of the element:	对元素的可变修改：
	Constructors	构造函数
	Even though it acts as a container, `boost::concurrent_node_set` does not model the standard C++ https://en.cppreference.com/w/cpp/named_req/Container[Container^] concept. In particular, iterators and associated operations (`begin`, `end`, etc.) are not provided. Element access is done through user-provided _visitation functions_ that are passed to `concurrent_node_set` operations where they are executed internally in a controlled fashion. Such visitation-based API allows for low-contention concurrent usage scenarios.	尽管 `boost::concurrent++_++node++_++set` 的行为类似于容器，但它并不符合标准 C{plus}{plus} https://en.cppreference.com/w/cpp/named_req/Container[容器] 概念。具体而言，它不提供迭代器及相关操作（如 `begin` 、 `end` 等）。元素的访问通过用户提供的 _访问函数_ 实现，这些函数被传递至 `concurrent++_++node++_++set` 的内部操作，并以受控方式执行。这种基于访问的 API 设计支持低竞争度的并发使用场景。
	The internal data structure of `boost::concurrent_node_set` is similar to that of `boost::unordered_node_set`. Unlike `boost::concurrent_flat_set`, pointer stability and node handling functionalities are provided, at the expense of potentially lower performance.	`boost::concurrent++_++node++_++set` 的内部数据结构与 `boost::unordered++_++node++_++set` 类似。与 `boost::concurrent++_++flat++_++set` 不同，它提供了指针稳定性和节点处理功能，但可能以性能降低为代价。
	Description	描述
	Template Parameters	模板参数
	_Key_	_键_
	and https://en.cppreference.com/w/cpp/named_req/Erasable[Erasable^] from the container.	https://en.cppreference.com/w/cpp/named_req/MoveInsertable[可移动插入] 到容器中的要求，且需满足从容器中 https://en.cppreference.com/w/cpp/named_req/Erasable[可擦除] 的要求。
	_Hash_	_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`.	一元函数对象类型，用作 `Key` 的哈希函数。它接受一个类型为 `Key`
	An allocator whose value type is the same as the table's value type.	值类型与该表的值类型相同的分配器。
	The element nodes of the table are held into an internal _bucket array_. An node is inserted into a bucket determined by the hash code of its element, but if the bucket is already occupied (a _collision_), an available one in the vicinity of the original position is used.	该表的元素节点存储于内部桶数组中。节点会根据其元素的哈希值插入到对应的桶内；若该桶已被占用（即发生哈希冲突），则使用原位置附近的可用桶进行存储。
	The size of the bucket array can be automatically increased by a call to `insert`/`emplace`, or as a result of calling `rehash`/`reserve`. The _load factor_ of the table (number of elements divided by number of buckets) is never greater than `max_load_factor()`, except possibly for small sizes where the implementation may decide to allow for higher loads.	通过调用 `insert`/`emplace`，或执行 `rehash`/`reserve` 操作，可自动扩容桶数组的大小。容器的负载因子（元素数量除以桶数量）永远不会大于 `max_load_factor()`，仅在容器尺寸极小时，实现可能允许负载因子略高于该值。
	If `link:../../../../../container_hash/doc/html/hash.html#ref_hash_is_avalanchinghash[hash_is_avalanching]<Hash>::value` is `true`, the hash function is used as-is; otherwise, a bit-mixing post-processing stage is added to increase the quality of hashing at the expense of extra computational cost.	若 `link:../../../../../container_hash/doc/html/hash.html#ref_hash_is_avalanchinghash[hash_is_avalanching]<hash>::value` 为 `true`，则直接使用原哈希函数；否则会添加一个位混合后置处理阶段，以额外计算开销为代价提升哈希质量。</hash>
	Concurrency Requirements and Guarantees	并发要求与保证

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