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	Avoid gcc's `-Wshadow` warning.	规避 gcc 的 `-Wshadow` 编译警告。
	{svn-ticket-url}/6905[Ticket 6905^]:	https://svn.boost.org/trac/boost/ticket/6905[问题单 6905] ：
	Make namespaces in macros compatible with `bcp` custom namespaces. Fixed by Luke Elliott.	使宏中的命名空间与 `bcp` 自定义命名空间兼容（由 Luke Elliott 修复）。
	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。
	On machines with 64 bit std::size_t, use power of 2 buckets, with Thomas	64 位 std::size_t 机器上使用 2 的幂次桶数量，通过 Thomas
	Wang's hash function to pick which one to use. As modulus is very slow for 64 bit values.	Wang 哈希函数选择桶（因取模运算在 64 位值上极慢）。
	Some internal changes.	部分内部变更。
	Release 1.49.0	版本 1.49.0
	Fix warning due to accidental odd assignment.	修复因意外出现的异常赋值操作而产生的编译警告。
	Slightly better error messages.	轻微优化错误消息。
	Release 1.48.0 - Major update	版本 1.48.0 - 重大更新
	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] 。
	The container now meets {cpp}11's complexity requirements, but to do so uses a little more memory. This means that `quick_erase` and `erase_return_void` are no longer required, they'll be removed in a future version.	该容器现满足 C{plus}{plus}11 的复杂度要求，但为此会占用稍多内存。这意味着 `quick_erase` 与 `erase_return_void` 接口已不再必需，将在未来版本中移除。
	{cpp}11 support has resulted in some breaking changes:	C{plus}{plus}11 支持导致部分破坏性变更：
	Equality comparison has been changed to the {cpp}11 specification.	相等性比较已改为遵循 C{plus}{plus}11 规范。
	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，
	pointers, rather than the allocator's `pointer` type.	而非分配器定义的 `pointer` 类型。
	`emplace` used to emulate the variadic pair constructors that	`emplace` 方法原先模拟了
	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。

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	regression when inserting consecutive integers, although makes other uses slower ({svn-ticket-url}/9282[#9282^]).	插入连续整数时的性能回归问题，但可能会降低其他使用场景的速度(https://svn.boost.org/trac/boost/ticket/9282[#9282])。
	Only construct elements using allocators, as specified in {cpp}11 standard.	严格遵循 C{plus}{plus}11 标准规定，仅使用分配器构造元素。
	Avoid some warnings ({svn-ticket-url}/8851[#8851^], {svn-ticket-url}/8874[#8874^]).	避免部分警告(https://svn.boost.org/trac/boost/ticket/8851[#8851] 、 https://svn.boost.org/trac/boost/ticket/8874[#8874])。
	More internal implementation changes, including a much simpler	更多内部实现变更，包括采用更简化的
	implementation of `erase`.	`erase` 方法实现。
	Faster assign, which assigns to existing nodes where possible, rather than	加速赋值操作：尽可能复用现有节点进行赋值，
	creating entirely new nodes and copy constructing.	而非创建全新节点并执行复制构造。
	Fixed bug in `erase_range` ({svn-ticket-url}/7471[#7471^]).	修复 `erase_range` 方法中的缺陷(https://svn.boost.org/trac/boost/ticket/7471[#7471])。
	Reverted some of the internal changes to how nodes are created, especially	回退部分关于节点创建机制的内部变更（尤其
	Updated to use the new config macros.	更新为使用新的配置宏。
	Release 1.50.0	版本 1.50.0
	{svn-ticket-url}/6905[Ticket 6905^]:	https://svn.boost.org/trac/boost/ticket/6905[问题单 6905] ：
	On machines with 64 bit std::size_t, use power of 2 buckets, with Thomas	64 位 std::size_t 机器上使用 2 的幂次桶数量，通过 Thomas
	Wang's hash function to pick which one to use. As modulus is very slow for 64 bit values.	Wang 哈希函数选择桶（因取模运算在 64 位值上极慢）。
	Fix warning due to accidental odd assignment.	修复因意外出现的异常赋值操作而产生的编译警告。
	The container now meets {cpp}11's complexity requirements, but to do so uses a little more memory. This means that `quick_erase` and `erase_return_void` are no longer required, they'll be removed in a future version.	该容器现满足 C{plus}{plus}11 的复杂度要求，但为此会占用稍多内存。这意味着 `quick_erase` 与 `erase_return_void` 接口已不再必需，将在未来版本中移除。
	{cpp}11 support has resulted in some breaking changes:	C{plus}{plus}11 支持导致部分破坏性变更：
	Equality comparison has been changed to the {cpp}11 specification.	相等性比较已改为遵循 C{plus}{plus}11 规范。
	pointers, rather than the allocator's `pointer` type.	而非分配器定义的 `pointer` 类型。
	`emplace` used to emulate the variadic pair constructors that	`emplace` 方法原先模拟了
	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。
	Release 1.43.0	版本 1.43.0
	`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。
	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。
	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。

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