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On old versions of Visual {cpp}, use the container library's implementation
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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
Fix equality for `unordered_multiset` and `unordered_multimap`.
修复 `unordered_multiset` 与 `unordered_multimap` 的相等性判断逻辑。
{svn-ticket-url}/6857[Ticket 6857^]:
https://svn.boost.org/trac/boost/ticket/6857[问题单 6857] ：
Implement `reserve`.
实现 `reserve` 。
{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。
{svn-ticket-url}/6784[Ticket 6784^]:
https://svn.boost.org/trac/boost/ticket/6784[问题单 6784] ：
Fix some Sun specific code.
修复部分 Sun 编译器专用代码。
{svn-ticket-url}/6190[Ticket 6190^]:
https://svn.boost.org/trac/boost/ticket/6190[问题单 6190] ：
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。
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Release 1.52.0
版本 1.52.0
for {cpp}11 compilers. 'construct' and 'destroy' should work a little better for {cpp}11 allocators.
针对 C{plus}{plus}11 编译器），使 'construct' 和 'destroy' 对 C{plus}{plus}11 分配器更有效。
Simplified the implementation a bit. Hopefully more robust.
简化实现，以提高健壮性。
Release 1.51.0
版本 1.51.0
Fix construction/destruction issue when using a {cpp}11 compiler with a
修复当使用 C{plus}{plus}11 编译器搭配 C{plus}{plus}03 分配器时
{cpp}03 allocator ({svn-ticket-url}/7100[#7100^]).
出现的构造/析构问题(https://svn.boost.org/trac/boost/ticket/7100[#7100])。
Remove a `try..catch` to support compiling without exceptions.
移除一段 `try..catch` 代码块以支持无异常编译模式。
Adjust SFINAE use to try to support g++ 3.4 ({svn-ticket-url}/7175[#7175^]).
调整 SFINAE 的实现方式以兼容 g{plus}{plus} 3.4(https://svn.boost.org/trac/boost/ticket/7175[#7175])。
Fix equality for `unordered_multiset` and `unordered_multimap`.
修复 `unordered_multiset` 与 `unordered_multimap` 的相等性判断逻辑。
{svn-ticket-url}/6857[Ticket 6857^]:
https://svn.boost.org/trac/boost/ticket/6857[问题单 6857] ：
Implement `reserve`.
实现 `reserve` 。
Fix some Sun specific code.
修复部分 Sun 编译器专用代码。
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。
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] ：

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On old versions of Visual {cpp}, use the container library's implementation
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
06/05/2026
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On old versions of Visual {cpp}, use the container library's implementation
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06/05/2026
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Unit identifier
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Source string location
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String age
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Last updated
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Source string age
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