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	appeared in early {cpp}0x drafts. Since they were removed it no longer does so. It does emulate the new `piecewise_construct` pair constructors - only you need to use `boost::piecewise_construct`. To use the old emulation of the variadic constructors define `BOOST_UNORDERED_DEPRECATED_PAIR_CONSTRUCT`.	早期 C{plus}{plus}0x 草案中的变参 pair 构造函数。由于该特性已被移除，现不再提供此模拟实现。当前仅模拟新的 `piecewise_construct` pair 构造函数，但需使用 `boost::piecewise_construct` 作为参数。若需启用旧版变参构造函数的模拟行为，请定义宏 `BOOST_UNORDERED_DEPRECATED_PAIR_CONSTRUCT` 。
	Release 1.45.0	版本 1.45.0
	Fix a bug when inserting into an `unordered_map` or `unordered_set` using	修复了在使用返回 `value_type` 副本的迭代器插入 `unordered_map` 或 `unordered_set` 时的一个错误。
	iterators which returns `value_type` by copy.	(使用返回 `value_type` 副本)
	Release 1.43.0	版本 1.43.0
	{svn-ticket-url}/3966[Ticket 3966^]:	https://svn.boost.org/trac/boost/ticket/3966[问题单 3966] ：
	`erase_return_void` is now `quick_erase`, which is the http://home.roadrunner.com/~hinnant/issue_review/lwg-active.html#579[ current forerunner for resolving the slow erase by iterator^], although there's a strong possibility that this may change in the future. The old method name remains for backwards compatibility but is considered deprecated and will be removed in a future release.	`erase_return_void` 更名为 `quick_erase` （符合 http://home.roadrunner.com/~hinnant/issue_review/lwg-active.html#579[当前迭代器擦除缓慢的解决方案^]）。旧方法名出于向后兼容性予以保留，但已被视为弃用接口，将在未来版本中移除。
	Use Boost.Exception.	使用 Boost.Exception。
	Stop using deprecated `BOOST_HAS_*` macros.	停止使用已弃用的 `BOOST_HAS_*` 系列宏。
	Release 1.42.0	版本 1.42.0
	Support instantiating the containers with incomplete value types.	支持使用不完整值类型来实例化容器。
	Reduced the number of warnings (mostly in tests).	减少编译警告数量（主要出现在测试中）。
	Improved codegear compatibility.	提升 Codegear 兼容性。
	{svn-ticket-url}/3693[Ticket 3693^]:	https://svn.boost.org/trac/boost/ticket/3693[问题单 3693] ：
	Add `erase_return_void` as a temporary workaround for the current `erase` which can be inefficient because it has to find the next element to return an iterator.	新增 `erase_return_void` 作为临时解决方案，以应对当前 `erase` 方法因需查找下一元素返回迭代器而可能产生的效率问题。
	Add templated find overload for compatible keys.	新增针对兼容键的模板化 find 重载。
	{svn-ticket-url}/3773[Ticket 3773^]:	https://svn.boost.org/trac/boost/ticket/3773[问题单 3773] ：
	Add missing `std` qualifier to `ptrdiff_t`.	为 `ptrdiff_t` 添加缺失的 `std` 限定符。
	Some code formatting changes to fit almost all lines into 80 characters.	调整代码格式，使大多数代码行不超过 80 字符。
	Release 1.41.0 - Major update	版本 1.41.0 - 重大更新
	The original version made heavy use of macros to sidestep some of the older	初始版本曾大量使用
	compilers' poor template support. But since I no longer support those compilers and the macro use was starting to become a maintenance burden it has been rewritten to use templates instead of macros for the implementation classes.	宏来规避旧式编译器薄弱的模板支持能力。鉴于现已不再支持这些编译器，且宏的使用逐渐成为维护负担，现将实现类重构为使用模板替代宏。
	The container object is now smaller thanks to using `boost::compressed_pair`	通过 `boost::compressed_pair` 实现 EBO 及微调函数缓冲区
	for EBO and a slightly different function buffer - now using a bool instead of a member pointer.	（现使用 bool 替代成员指针），容器对象的内存占用得以减小。
	Buckets are allocated lazily which means that constructing an empty container	桶采用延迟分配机制，这意味着构造空容器时
	will not allocate any memory.	不会分配任何内存。
	Release 1.40.0	版本 1.40.0
	{svn-ticket-url}/2975[Ticket 2975^]:	https://svn.boost.org/trac/boost/ticket/2975[问题单 2975] ：
	Store the prime list as a preprocessor sequence - so that it will always get the length right if it changes again in the future.	将质数列表存储为预处理序列，确保未来再次调整列表长度时能自动保持正确。
	{svn-ticket-url}/1978[Ticket 1978^]:	https://svn.boost.org/trac/boost/ticket/1978[问题单 1978] ：
	Implement `emplace` for all compilers.	为所有编译器实现 `emplace` 。

	English	Chinese (Simplified Han script)	Actions
	Remove some of the smaller prime number of buckets, as they may make	移除部分较小的质数桶数量，因为这些数值
	collisions quite probable (e.g. multiples of 5 are very common because we used base 10).	可能显著增加冲突概率（例如，由于我们使用十进制，5的倍数出现频率很高）。
	On old versions of Visual {cpp}, use the container library's implementation	对于旧版本 Visual C{plus}{plus}，优先使用容器库自带的
	of `allocator_traits`, as it's more likely to work.	`allocator_traits` 实现，因其兼容性更佳。
	Some internal changes.	部分内部变更。
	This is major change which has been converted to use Boost.Move's move emulation, and be more compliant with the {cpp}11 standard. See the xref:compliance.adoc[compliance section] for details.	本本次为重大更新：容器已改用 Boost.Move 的移动操作模拟实现，并显著提升了对 C{plus}{plus}11 标准的符合性。详见 xref:compliance.adoc[标准合规性章节] 。
	In a container with equivalent keys, elements in a group with equal keys used to have to be in the same order to be considered equal, now they can be a permutation of each other. To use the old behavior define the macro `BOOST_UNORDERED_DEPRECATED_EQUALITY`.	在包含等价键的容器中，原先要求同一组等价键内的元素必须顺序一致才被视为相等，现在则允许它们互为排列。如需使用旧行为，请定义宏 `BOOST_UNORDERED_DEPRECATED_EQUALITY` 。
	The behaviour of swap is different when the two containers to be	当两个待交换容器的分配器不相等时，swap 操作的行为发生变更。
	swapped has unequal allocators. It used to allocate new nodes using the appropriate allocators, it now swaps the allocators if the allocator has a member structure `propagate_on_container_swap`, such that `propagate_on_container_swap::value` is true.	旧版本会通过相应的分配器分配新节点，现在则改为：若分配器包含 `propagate_on_container_swap` 成员结构体且其 `propagate_on_container_swap::value` 为 true，则会交换分配器本身。
	Allocator's `construct` and `destroy` functions are called with raw	现在当调用分配器的 `construct` 与 `destroy` 时，直接传入原始指针，
	appeared in early {cpp}0x drafts. Since they were removed it no longer does so. It does emulate the new `piecewise_construct` pair constructors - only you need to use `boost::piecewise_construct`. To use the old emulation of the variadic constructors define `BOOST_UNORDERED_DEPRECATED_PAIR_CONSTRUCT`.	早期 C{plus}{plus}0x 草案中的变参 pair 构造函数。由于该特性已被移除，现不再提供此模拟实现。当前仅模拟新的 `piecewise_construct` pair 构造函数，但需使用 `boost::piecewise_construct` 作为参数。若需启用旧版变参构造函数的模拟行为，请定义宏 `BOOST_UNORDERED_DEPRECATED_PAIR_CONSTRUCT` 。
	Release 1.45.0	版本 1.45.0
	iterators which returns `value_type` by copy.	(使用返回 `value_type` 副本)
	Use Boost.Exception.	使用 Boost.Exception。
	Stop using deprecated `BOOST_HAS_*` macros.	停止使用已弃用的 `BOOST_HAS_*` 系列宏。
	Add templated find overload for compatible keys.	新增针对兼容键的模板化 find 重载。
	{svn-ticket-url}/3773[Ticket 3773^]:	https://svn.boost.org/trac/boost/ticket/3773[问题单 3773] ：
	Add missing `std` qualifier to `ptrdiff_t`.	为 `ptrdiff_t` 添加缺失的 `std` 限定符。
	Some code formatting changes to fit almost all lines into 80 characters.	调整代码格式，使大多数代码行不超过 80 字符。
	for EBO and a slightly different function buffer - now using a bool instead of a member pointer.	（现使用 bool 替代成员指针），容器对象的内存占用得以减小。
	Buckets are allocated lazily which means that constructing an empty container	桶采用延迟分配机制，这意味着构造空容器时
	will not allocate any memory.	不会分配任何内存。
	Release 1.40.0	版本 1.40.0
	{svn-ticket-url}/2975[Ticket 2975^]:	https://svn.boost.org/trac/boost/ticket/2975[问题单 2975] ：
	Store the prime list as a preprocessor sequence - so that it will always get the length right if it changes again in the future.	将质数列表存储为预处理序列，确保未来再次调整列表长度时能自动保持正确。
	{svn-ticket-url}/3096[Ticket 3096^]: Some workarounds for old versions of borland, including adding explicit destructors to all containers.	https://svn.boost.org/trac/boost/ticket/3096[问题单 3096] ：针对旧版 borland 的变通方案（包括为所有容器添加显式析构函数）。
	{svn-ticket-url}/3082[Ticket 3082^]:	https://svn.boost.org/trac/boost/ticket/3082[问题单 3082] ：
	Disable incorrect Visual {cpp} warnings.	禁用 Visual C{plus}{plus} 编译器的错误警告。
	Create less buckets by default.	默认创建更少的桶。
	Avoid an unnecessary copy in `operator[]`.	避免 `operator[]` 中不必要的复制。

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