Boost Unordered Translation (zh_Hans)/Doc / Modules / Root / Pages / Reference / Concurrent Node Map (adoc) — Chinese (Simplified Han script) @ Boost-Weblate: Read access to the element.

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Key	English	Chinese (Simplified Han script)
	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，可自动增大桶数组的大小。哈希表的负载因子（元素数量除以桶数量）永远不会大于 `max_load_factor()`，仅在尺寸极小时，实现可能允许更高的负载。
	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；否则会添加一个比特混合后处理阶段，以额外计算开销为代价提升哈希质量。</hash>
:388	---	---
	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`</alloc>
	`std::allocator_traits<Alloc>::deallocate`	`std::allocator_traits<alloc>::deallocate`</alloc>
	`std::allocator_traits<Alloc>::construct`	`std::allocator_traits<alloc>::construct`</alloc>
	`std::allocator_traits<Alloc>::destroy`	`std::allocator_traits<alloc>::destroy`</alloc>
	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_map` do not introduce data races — that is, they are thread-safe.	除析构操作外，对同一个 `concurrent++_++node++_++map` 实例并发调用任何操作都不会引入数据竞争——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_map`, prior blocking operations on `x` synchronize with op. So, blocking operations on the same `concurrent_node_map` execute sequentially in a multithreaded scenario.	如果某个操作 op 被显式指定为__阻塞于__ `x` （其中 `x` 是 `boost::concurrent++_++node++_++map` 的实例），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++_++map` 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_map`, the following operations by a user-provided visitation function on the element passed do not introduce data races:	当由 `boost::concurrent++_++node++_++map` 在内部执行时，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_map 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++_++map 操作 ` 都会与对 `e` 执行的内部访问函数的调用同步。
	Visitation functions executed by a `boost::concurrent_node_map` `x` are not allowed to invoke any operation on `x`; invoking operations on a different `boost::concurrent_node_map` instance `y` is allowed only if concurrent outstanding operations on `y` do not access `x` directly or indirectly.	由 `boost::concurrent++_++node++_++map` 实例 `x` 执行的访问函数不允许调用 `x` 上的任何操作；仅当对另一 `boost::concurrent++_++node++_++map` 实例 `y` 的并发未完成操作不会直接或间接访问 `x` 时，才会允许调用 `y` 上的操作。
:432	---	---
	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。
:445	---	---
	`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。
:452	---	---
	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] 。

	English	Chinese (Simplified Han script)	Actions
	extract_if	条件提取
	key_eq	key_eq
	Saving an concurrent_node_map to an archive	将 concurrent++_++node++_++map 保存至归档
	[#concurrent_node_map]	[#concurrent_node_map]
	Class Template concurrent_node_map	类模板 concurrent++_++node++_++map
	:idprefix: concurrent_node_map_	:idprefix: concurrent_node_map_
	Template Parameters	模板参数
	Allocators using https://en.cppreference.com/w/cpp/named_req/Allocator#Fancy_pointers[fancy pointers] are supported.	支持使用 https://en.cppreference.com/w/cpp/named_req/Allocator#Fancy_pointers[花式指针] 的分配器。
	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，可自动增大桶数组的大小。哈希表的负载因子（元素数量除以桶数量）永远不会大于 `max_load_factor()`，仅在尺寸极小时，实现可能允许更高的负载。
	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__。
	Read access to the element.	对元素的读取访问。
	`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。
	```cpp static constexpr size_type bulk_visit_size; ```	```cpp static constexpr size_type bulk_visit_size; ```
	```c++ explicit concurrent_node_map(size_type n, const hasher& hf = hasher(), const key_equal& eql = key_equal(), const allocator_type& a = allocator_type()); ```	```c++ explicit concurrent_node_map(size_type n, const hasher& hf = hasher(), const key_equal& eql = key_equal(), const allocator_type& a = allocator_type()); ```
	Copy Constructor	复制构造函数
	```c++ concurrent_node_map(concurrent_node_map&& other); ```	```c++ concurrent_node_map(concurrent_node_map&& other); ```
	Move Constructor from unordered_node_map	基于 unordered_node_map 的移动构造函数
	Iterator Range Constructor with Bucket Count and Allocator	带桶数和分配器的迭代器范围构造函数
	```c++ ~concurrent_node_map(); ```	```c++ ~concurrent_node_map(); ```
	Assignment	赋值操作
	Copy Assignment	复制赋值
	```c++ concurrent_node_map& operator=(concurrent_node_map const& other); ```	```c++ concurrent_node_map& operator=(concurrent_node_map const& other); ```
	Bulk visit	批量访问
	Insert Initializer List	初始化列表插入
	Effects:;; Does nothing, as the user is not allowed to change this parameter. Kept for compatibility with `boost::unordered_map`.	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_map` 保持兼容。
	max_load	max_load（最大负载）
	```c++ size_type max_load() const noexcept; ```	```c++ size_type max_load() const noexcept; ```
	``concurrent_node_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++_++node++_++map` 可通过本库提供的 API，借助 link:../../../../../serialization/index.html[Boost.Serialization] 实现归档/检索功能。同时支持常规格式与 XML 格式的归档文件。
	Saves all the elements of a `concurrent_node_map` `x` to an archive (XML archive) `ar`.	将 `concurrent++_++node++_++map` 容器 `x` 中的所有元素保存至归档（XML 格式归档） `ar` 中。

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