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iterators which returns `value_type` by copy.
iterators which returns(使用返回 `value_type` by copy.副本)
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Fix a bug when inserting into an `unordered_map` or `unordered_set` using
Fix a bug when inserting into an修复了在使用返回 `value_type` 副本的迭代器插入 `unordered_map` or或 `unordered_set` using时的一个错误。
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Release 1.45.0
Release版本 1.45.0
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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`.
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`. 。
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`emplace` used to emulate the variadic pair constructors that
`emplace` used to emulate the variadic pair constructors that方法原先模拟了
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pointers, rather than the allocator's `pointer` type.
pointers, rather than the allocator's而非分配器定义的 `pointer` type.类型。
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Allocator's `construct` and `destroy` functions are called with raw
Allocator's现在当调用分配器的 `construct` and与 `destroy` functions are called with raw时，直接传入原始指针，
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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.
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`, such that 成员结构体且其 `propagate_on_container_swap::value` is为 true.，则会交换分配器本身。
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The behaviour of swap is different when the two containers to be
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。
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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`.
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`. 。
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Equality comparison has been changed to the {cpp}11 specification.
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。
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{cpp}11 support has resulted in some breaking changes:
{cpp}11 support has resulted in some breaking changes:C{plus}{plus}11 支持导致部分破坏性变更：
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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.
The container now meets {cpp}11's complexity requirements, but to do so uses a little more memory. This means that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` and与 `erase_return_void` are no longer required, they'll be removed in a future version.接口已不再必需，将在未来版本中移除。
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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.
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] 。
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Release 1.48.0 - Major update
Release版本 1.48.0 - Major update重大更新
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Slightly better error messages.
Slightly better error messages.轻微优化错误消息。
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Fix warning due to accidental odd assignment.
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。
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Release 1.49.0
Release版本 1.49.0
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Some internal changes.
Some internal changes.部分内部变更。
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Wang's hash function to pick which one to use. As modulus is very slow for 64 bit values.
Wang's hash function to pick which one to use. As modulus is very slow for 64 bit values. 哈希函数选择桶（因取模运算在 64 位值上极慢）。
06/05/2026

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