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	Release 1.85.0	版本 1.85.0
	Optimized `emplace()` for a `value_type` or `init_type` (if applicable) argument to bypass creating an intermediate object. The argument is already the same type as the would-be intermediate object.	优化 `emplace()` 对 `value_type` 或 `init_type` （如适用）参数的实现，使其无需创建中间对象即可直接处理参数，因为该参数类型与待构造的中间对象类型完全相同。
	Optimized `emplace()` for `k,v` arguments on map containers to delay constructing the object until it is certain that an element should be inserted. This optimization happens when the map's `key_type` is move constructible or when the `k` argument is a `key_type`.	优化 map 容器的 `emplace()` 对 `k,v` 参数的处理：将对象构造延迟到确认需要插入元素时执行。此优化在映射的 `key_type` 可移动构造或 `k` 参数为 `key_type` 类型时生效。
	Fixed support for allocators with `explicit` copy constructors ({github-pr-url}/234[PR#234^]).	修复对含 `explicit` 复制构造函数的分配器的支持(https://github.com/boostorg/unordered/pull/234[PR#234])。
	Fixed bug in the `const` version of `unordered_multimap::find(k, hash, eq)` ({github-pr-url}/238[PR#238^]).	修复 `unordered_multimap::find(k, hash, eq)` 的 `const` 版本中的缺陷(https://github.com/boostorg/unordered/pull/238[PR#238])。
	Release 1.84.0 - Major update	版本 1.84.0 - 重大更新
	Added `boost::concurrent_flat_set`.	新增 `boost::concurrent_flat_set` 。
	Added `[c]visit_while` operations to concurrent containers,	为并发容器新增 `[c]visit_while` 操作，
	with serial and parallel variants.	提供串行与并行两种执行模式。
	Added efficient move construction of `boost::unordered_flat_(map\|set)` from	实现高效双向移动构造（从
	`boost::concurrent_flat_(map\|set)` and vice versa.	`boost::unordered_flat_(map\|set)` 到 `boost::concurrent_flat_(map\|set)` 及反向的）
	Added bulk visitation to concurrent containers for increased lookup performance.	为并发容器新增批量访问功能以提升查找性能。
	Added debug-mode mechanisms for detecting illegal reentrancies into	新增调试模式机制，用于检测用户代码对
	a concurrent container from user code.	并发容器的非法重入操作。
	Added Boost.Serialization support to all containers and their (non-local) iterator types.	为所有容器及其（非本地）迭代器类型添加 Boost.Serialization 支持。
	Added support for fancy pointers to open-addressing and concurrent containers.	为开放寻址容器与并发容器新增对花式指针的支持，此特性支持诸如使用 Boost.Interprocess 分配器在共享内存中构建容器等应用场景。
	This enables scenarios like the use of Boost.Interprocess allocators to construct containers in shared memory.	这使得像使用 Boost.Interprocess 分配器在共享内存中构造容器这样的场景成为可能。
	Fixed bug in member of pointer operator for local iterators of closed-addressing	修复闭寻址容器局部迭代器的成员指针运算符缺陷
	containers ({github-pr-url}/221[PR#221^], credit goes to GitHub user vslashg for finding and fixing this issue).	（https://github.com/boostorg/unordered/pull/221[PR#221] ，致谢 GitHub 用户 vslashg 发现并修复）。
	Starting with this release, `boost::unordered_[multi]set` and `boost::unordered_[multi]map`	从此版本起， `boost::unordered_[multi]set` 和 `boost::unordered_[multi]map`
	only work with C++11 onwards.	仅支持 C{plus}{plus}11 及以上版本。
	Release 1.83.0 - Major update	版本 1.83.0 - 重大更新
	Added `boost::concurrent_flat_map`, a fast, thread-safe hashmap based on open addressing.	新增基于开放寻址的快速线程安全哈希映射容器 `boost::concurrent_flat_map` 。
	Sped up iteration of open-addressing containers.	提升开放寻址容器的迭代性能。
	In open-addressing containers, `erase(iterator)`, which previously returned nothing, now	在开放寻址容器中，原无返回值的 `erase(iterator)` 方法，现在
	returns a proxy object convertible to an iterator to the next element. This enables the typical `it = c.erase(it)` idiom without incurring any performance penalty when the returned proxy is not used.	返回一个可转换为下一元素迭代器的代理对象。此改进支持典型的 `it = c.erase(it)` 编程范式，且当未使用返回的代理对象时不会产生任何性能开销。
	Release 1.82.0 - Major update	版本 1.82.0 - 重大更新
	{cpp}03 support is planned for deprecation. Boost 1.84.0 will no longer support	计划弃用 C{plus}{plus}03 支持。Boost 1.84.0 将不再支持
	{cpp}03 mode and {cpp}11 will become the new minimum for using the library.	C{plus}{plus}03 模式，C{plus}{plus}11 将成为使用该库的最低要求。
	Added node-based, open-addressing containers	新增基于节点的开放寻址容器
	`boost::unordered_node_map` and `boost::unordered_node_set`.	`boost::unordered_node_map` 与 `boost::unordered_node_set`。

	English	Chinese (Simplified Han script)	Actions
	Deprecated `boost::unordered::hash_is_avalanching` is now a using-declaration of	已弃用的 boost::unordered::hash_is_avalanching 现在是
	Added `pull(const_iterator)` to open-addressing containers. This operation	为开放寻址容器新增 `pull(const_iterator)` 操作，该操作
	Release 1.88.0	版本 1.88.0
	Equipped open-addressing and concurrent containers to internally calculate and provide statistical metrics affected by the quality of the hash function. This functionality is enabled by the global macro `BOOST_UNORDERED_ENABLE_STATS`.	为开放寻址容器与并发容器增设内部统计功能，可计算并提供受哈希函数质量影响的统计指标。通过全局宏 `BOOST_UNORDERED_ENABLE_STATS` 启用。
	Avalanching hash functions must now be marked via an `is_avalanching` typedef with an embedded `value` constant set to `true` (typically, defining `is_avalanching` as `std::true_type`). `using is_avalanching = void` is deprecated but allowed for backwards compatibility.	雪崩哈希函数现在必须通过内嵌 `value` 常量设为 `true` 的 `is_avalanching` typedef 来标记（通常将 `is_avalanching` 定义为 `std::true_type`）。 `using is_avalanching = void` 已被弃用，但为了向后兼容性仍予保留。
	Added `[c]visit_while` operations to concurrent containers,	为并发容器新增 `[c]visit_while` 操作，
	with serial and parallel variants.	提供串行与并行两种执行模式。
	Added efficient move construction of `boost::unordered_flat_(map\|set)` from	实现高效双向移动构造（从
	`boost::concurrent_flat_(map\|set)` and vice versa.	`boost::unordered_flat_(map\|set)` 到 `boost::concurrent_flat_(map\|set)` 及反向的）
	Added bulk visitation to concurrent containers for increased lookup performance.	为并发容器新增批量访问功能以提升查找性能。
	Added support for fancy pointers to open-addressing and concurrent containers.	为开放寻址容器与并发容器新增对花式指针的支持，此特性支持诸如使用 Boost.Interprocess 分配器在共享内存中构建容器等应用场景。
	This enables scenarios like the use of Boost.Interprocess allocators to construct containers in shared memory.	这使得像使用 Boost.Interprocess 分配器在共享内存中构造容器这样的场景成为可能。
	Fixed bug in member of pointer operator for local iterators of closed-addressing	修复闭寻址容器局部迭代器的成员指针运算符缺陷
	containers ({github-pr-url}/221[PR#221^], credit goes to GitHub user vslashg for finding and fixing this issue).	（https://github.com/boostorg/unordered/pull/221[PR#221] ，致谢 GitHub 用户 vslashg 发现并修复）。
	Starting with this release, `boost::unordered_[multi]set` and `boost::unordered_[multi]map`	从此版本起， `boost::unordered_[multi]set` 和 `boost::unordered_[multi]map`
	returns a proxy object convertible to an iterator to the next element. This enables the typical `it = c.erase(it)` idiom without incurring any performance penalty when the returned proxy is not used.	返回一个可转换为下一元素迭代器的代理对象。此改进支持典型的 `it = c.erase(it)` 编程范式，且当未使用返回的代理对象时不会产生任何性能开销。
	{cpp}03 support is planned for deprecation. Boost 1.84.0 will no longer support	计划弃用 C{plus}{plus}03 支持。Boost 1.84.0 将不再支持
	`boost::unordered_node_map` and `boost::unordered_node_set`.	`boost::unordered_node_map` 与 `boost::unordered_node_set`。
	Various warning fixes in the test suite.	测试套件中的多项警告修复。
	Various reference documentation improvements.	多项参考文档改进。
	confuses some traits classes.	避免某些特征类产生混淆。
	Release 1.57.0	版本 1.57.0
	Release 1.55.0	版本 1.55.0
	{svn-ticket-url}/6771[Ticket 6771^]:	https://svn.boost.org/trac/boost/ticket/6771[问题 6771] ：
	Avoid gcc's `-Wfloat-equal` warning.	规避 gcc 的 `-Wfloat-equal` 编译警告。
	the max load factor, and use `double` in the calculation for greater accuracy.	并在计算过程中使用 `double` 类型来提高精度。

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