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	Fixed bug in internal emplace() impl where stack-local types were not properly	修复内部 emplace() 实现中存在的缺陷：
	constructed using the Allocator of the container which breaks uses-allocator construction.	该缺陷曾导致栈局部类型未能使用容器的分配器进行正确构造，从而违反分配器感知构造规范。
	Release 1.81.0 - Major update	版本 1.81.0 - 重大更新
	Added fast containers `boost::unordered_flat_map` and `boost::unordered_flat_set`	新增基于开放寻址的快速容器`boost::unordered_flat_map` and `boost::unordered_flat_set`。
	based on open addressing.	(基于开放寻址的)
	Added CTAD deduction guides for all containers.	为所有容器添加 CTAD 推导指引。
	Added missing constructors as specified in https://cplusplus.github.io/LWG/issue2713[LWG issue 2713].	补充 https://cplusplus.github.io/LWG/issue2713[LWG 问题 2713] 中要求的缺失构造函数。
	Release 1.80.0 - Major update	版本 1.80.0 - 重大更新
	Refactor internal implementation to be dramatically faster	重构内部实现以显著提升性能
	Allow `final` Hasher and KeyEqual objects	允许使用 `final` 修饰的 Hasher 和 KeyEqual 对象
	Update documentation, adding benchmark graphs and notes on the new internal	更新文档，新增性能基准对比图及关于新内部数据结构的说明
	data structures	（数据结构）
	Release 1.79.0	版本 1.79.0
:110	Improved {cpp}20 support:	增强 C{plus}{plus}20 标准兼容性：
	All containers have been updated to support heterogeneous `count`, `equal_range` and `find`. All containers now implement the member function `contains`. ** `erase_if` has been implemented for all containers.	所有容器均已完成升级，支持异构查找操作 `count` 、 `equal_range` 及 `find` 。所有容器现均已实现成员函数 `contains` 。 ** 所有容器均已实现 `erase_if` 功能。
	Improved {cpp}23 support:	增强 C{plus}{plus}23 标准兼容性：
	** All containers have been updated to support heterogeneous `erase` and `extract`.	** 所有容器均已完成升级，支持异构版本的 `erase` 与 `extract` 操作。
	Changed behavior of `reserve` to eagerly	更改 `reserve` 的行为，
	allocate ({github-pr-url}/59[PR#59^]).	使其立即分配桶数组空间(https://github.com/boostorg/unordered/pull/59[PR#59])。
	Various warning fixes in the test suite.	测试套件中的多项警告修复。
	Update code to internally use `boost::allocator_traits`.	将内部代码更新为使用 `boost::allocator_traits` 。
	Switch to Fibonacci hashing.	切换至斐波那契哈希算法。
	Update documentation to be written in AsciiDoc instead of QuickBook.	将文档编写格式从 QuickBook 切换为 AsciiDoc。
	Release 1.67.0	版本 1.67.0
	Improved {cpp}17 support:	增强 C{plus}{plus}17 标准兼容性：
	Add template deduction guides from the standard. Use a simple implementation of `optional` in node handles, so that they're closer to the standard. ** Add missing `noexcept` specifications to `swap`, `operator=` and node handles, and change the implementation to match. Using `std::allocator_traits::is_always_equal`, or our own implementation when not available, and `boost::is_nothrow_swappable` in the implementation.	新增标准的模板推导指南。在节点句柄中采用简化的 `optional` 实现，以使其更符合标准规范。 ** 为 `swap` 、 `operator=` 及节点句柄补充缺失的 `noexcept` 规范，调整实现以符合规范要求。在实现中使用 `std::allocator_traits::is_always_equal` （若该特性不可用则采用自有实现），以及 `boost::is_nothrow_swappable` 在实现中。
:136	Improved {cpp}20 support:	增强 C{plus}{plus}20 标准兼容性：
	** Use `boost::to_address`, which has the proposed {cpp}20 semantics, rather than the old custom implementation.	** 使用具有 C{plus}{plus}20 提案语义的 `boost::to_address` ，来替代原有的自定义实现。
	Add `element_type` to iterators, so that `std::pointer_traits`	向迭代器添加 `element_type` 类型定义，以支持 `std::pointer_traits` 的
	will work.	正常工作。
	Use `std::piecewise_construct` on recent versions of Visual {cpp},	在新版 Visual C{plus}{plus} 及

	English	Chinese (Simplified Han script)	Actions
	:idprefix: changes_ :svn-ticket-url: https://svn.boost.org/trac/boost/ticket :github-pr-url: https://github.com/boostorg/unordered/pull :cpp: C++	:idprefix: changes_ :svn-ticket-url: https://svn.boost.org/trac/boost/ticket :github-pr-url: https://github.com/boostorg/unordered/pull :cpp: C++
	allow for visitation of an element right after insertion (by contrast, `insert_or_visit(x, f)` only visits the element if insertion did _not_ take place).	支持在插入元素后立即对其进行访问（而 `insert_or_visit(x, f)` 仅在未执行插入时才访问元素）。
	Made visitation exclusive-locked within certain	在特定 `boost::concurrent_flat_set` 操作中启用独占锁访问机制，
	`boost::concurrent_flat_set` operations to allow for safe mutable modification of elements ({github-pr-url}/265[PR#265^]).	以支持对元素进行安全的可变修改(https://github.com/boostorg/unordered/pull/265[PR#265])。
	Allowed non-copyable callables to be passed to the `std::initializer_list` overloads of `insert_{and\|or}_[c]visit` for concurrent containers, by internally passing a `std::reference_wrapper` of the callable to the iterator-pair overloads.	通过内部将可调用对象的 `std::reference_wrapper` 传递给迭代器对重载，现允许向并发容器的 `insert_{and\|or}_[c]visit` 的 `std::initializer_list` 重载传递不可复制的可调用对象。
	Added Visual Studio Natvis framework custom visualizations for containers and iterators. This works for all containers with an allocator using raw pointers. In this release, containers and iterators are not supported if their allocator uses fancy pointers. This may be addressed in later releases.	为容器和迭代器添加 Visual Studio Natvis 框架的自定义可视化功能。此功能适用于所有使用原始指针分配器的容器。在此版本中，若容器或迭代器的分配器使用花式指针，则暂不支持该功能，此问题可能在后续版本中解决。
	Extended heterogeneous lookup to more member functions as specified in	将异构查找功能扩展至更多成员函数
	https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2023/p2363r5.html[P2363].	（根据https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2023/p2363r5.html[P2363] 规范）。
	Replaced the previous post-mixing process for open-addressing containers with	取代开放寻址容器原有的后混合处理流程（采用
	a new algorithm based on extended multiplication by a constant.	基于常量扩展乘法的新算法）。
	Fixed bug in internal emplace() impl where stack-local types were not properly	修复内部 emplace() 实现中存在的缺陷：
	Refactor internal implementation to be dramatically faster	重构内部实现以显著提升性能
	Allow `final` Hasher and KeyEqual objects	允许使用 `final` 修饰的 Hasher 和 KeyEqual 对象
	All containers have been updated to support heterogeneous `count`, `equal_range` and `find`. All containers now implement the member function `contains`. ** `erase_if` has been implemented for all containers.	所有容器均已完成升级，支持异构查找操作 `count` 、 `equal_range` 及 `find` 。所有容器现均已实现成员函数 `contains` 。 ** 所有容器均已实现 `erase_if` 功能。
	Improved {cpp}23 support:	增强 C{plus}{plus}23 标准兼容性：
	** All containers have been updated to support heterogeneous `erase` and `extract`.	** 所有容器均已完成升级，支持异构版本的 `erase` 与 `extract` 操作。
	Changed behavior of `reserve` to eagerly	更改 `reserve` 的行为，
	allocate ({github-pr-url}/59[PR#59^]).	使其立即分配桶数组空间(https://github.com/boostorg/unordered/pull/59[PR#59])。
	Improved {cpp}17 support:	增强 C{plus}{plus}17 标准兼容性：
	Add template deduction guides from the standard. Use a simple implementation of `optional` in node handles, so that they're closer to the standard. ** Add missing `noexcept` specifications to `swap`, `operator=` and node handles, and change the implementation to match. Using `std::allocator_traits::is_always_equal`, or our own implementation when not available, and `boost::is_nothrow_swappable` in the implementation.	新增标准的模板推导指南。在节点句柄中采用简化的 `optional` 实现，以使其更符合标准规范。 ** 为 `swap` 、 `operator=` 及节点句柄补充缺失的 `noexcept` 规范，调整实现以符合规范要求。在实现中使用 `std::allocator_traits::is_always_equal` （若该特性不可用则采用自有实现），以及 `boost::is_nothrow_swappable` 在实现中。
	and other uses of the Dinkumware standard library, now using Boost.Predef to check compiler and library versions.	其他使用 Dinkumware 标准库的环境中使用 `std::piecewise_construct` ，现在使用 Boost.Predef 来检查编译器和标准库版本。
	in order to remove dependency on Boost.Iterator.	以消除对 Boost.Iterator 的依赖。
	Remove iterators' inheritance from `std::iterator`, which is	移除迭代器对 `std::iterator` 的继承
	deprecated in {cpp}17, thanks to Daniela Engert ({github-pr-url}/7[PR#7^]).	（该基类在 C{plus}{plus}17 中已弃用），感谢 Daniela Engert的贡献(https://github.com/boostorg/unordered/pull/7[PR#7])。
	Stop using `BOOST_DEDUCED_TYPENAME`.	停止使用 `BOOST_DEDUCED_TYPENAME` 。
	Add deprecated attributes to `quick_erase` and `erase_return_void`.	向 `quick_erase` 和 `erase_return_void` 添加弃用属性。
	I really will remove them in a future version this time.	本次确认将在未来版本中移除这两个接口。
	`noexpect` specs for `swap` free functions. Add missing `insert(P&&)` methods.	`swap` 自由函数的 `noexcept` 规范。补充缺失的 `insert(P&&)` 方法。
	Release 1.64.0	版本 1.64.0
	Release 1.36.0	版本 1.36.0

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