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An iterator whose value type is `value_type`.
An iterator whose value type is一种迭代器，其值类型为 `value_type`. 。
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Typedefs
Typedefs类型定义
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---
---
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Globally define this macro to enable xref:reference/stats.adoc#stats[statistics calculation] for the container. Note that this option decreases the overall performance of many operations.
Globally define this macro to enable xref:reference/stats.adoc#stats[statistics calculation] for the container. Note that this option decreases the overall performance of many operations.全局定义此宏可为容器启用 xref:reference/stats.adoc#stats[统计计算]。请注意，此选项会降低许多操作的整体性能。
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`BOOST_UNORDERED_ENABLE_STATS`
`BOOST_UNORDERED_ENABLE_STATS`
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Configuration Macros
Configuration Macros配置宏
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---
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If `link:../../../../../container_hash/doc/html/hash.html#ref_hash_is_avalanchinghash[hash_is_avalanching]<Hash>::value` is `true`, the hash function is used as-is; otherwise, a bit-mixing post-processing stage is added to increase the quality of hashing at the expense of extra computational cost.
If如果 `link:../../../../../container_hash/doc/html/hash.html#ref_hash_is_avalanchinghash[hash_is_avalanching]<Hhash>::value` is为 `true`, the hash function is used as-is; otherwise, a bit-mixing post-processing stage is added to increase the quality of hashing at the expense of extra computational cost.，则哈希函数将按原样使用；否则，会增加一个位混合后处理阶段，以牺牲额外的计算成本为代价来提高哈希质量。</hash>
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The size of the bucket array can be automatically increased by a call to `insert`/`emplace`, or as a result of calling `rehash`/`reserve`. The _load factor_ of the container (number of elements divided by number of buckets) is never greater than `max_load_factor()`, except possibly for small sizes where the implementation may decide to allow for higher loads.
The size of the bucket array can be automatically increased by a call to `insert`/`emplace`, or as a result of calling `rehash`/`reserve`. The _load factor_ of the container (number of elements divided by number of buckets) is never greater than `max_load_factor()`, except possibly for small sizes where the implementation may decide to allow for higher loads.桶数组的大小可以通过调用 `insert`/`emplace` 自动增加，或者作为调用 `rehash`/`reserve` 的结果。容器的 _负载因子_（元素数量除以桶数量）永远不会大于 `max_load_factor()`，但在容器规模较小时，实现可能会允许更高的负载。
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The element nodes of the container are held into an internal _bucket array_. A node is inserted into a bucket determined by the hash code of its element, but if the bucket is already occupied (a _collision_), an available one in the vicinity of the original position is used.
The element nodes of the container are held into an internal _bucket array_. A node is inserted into a bucket determined by the hash code of its element, but if the bucket is already occupied (a _collision_), an available one in the vicinity of the original position is used.容器的元素节点被保存在内部的 _桶数组_ 中。节点根据其元素的哈希码被插入到对应的桶中，但如果该桶已被占用（发生 _冲突_），则会使用原始位置附近的一个可用桶。
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Allocators using https://en.cppreference.com/w/cpp/named_req/Allocator#Fancy_pointers[fancy pointers] are supported.
Allocators using支持使用 https://en.cppreference.com/w/cpp/named_req/Allocator#Fancy_pointers[fancy pointers] are supported.异形指针] 的分配器。
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An allocator whose value type is the same as the container's value type.
An allocator whose value type is the same as the container's value type.一个分配器，其值类型与容器的值类型相同。
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_Allocator_
_Allocator_分配器
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A binary function object that induces an equivalence relation on values of type `Key`. It takes two arguments of type `Key` and returns a value of type `bool`.
A binary function object that induces an equivalence relation on values of type `Key`. It takes two arguments of type `Key` and returns a value of type一个二元函数对象，用于在 `Key` 类型的值上诱导出等价关系。它接受两个 `Key` 类型的参数，并返回一个 `bool`. 类型的值。
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_Pred_
_Pred_
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A unary function object type that acts a hash function for a `Key`. It takes a single argument of type `Key` and returns a value of type `std::size_t`.
A unary function object type that acts a hash function for a `Key`. It takes a single argument of type `Key` and returns a value of type一个一元函数对象类型，用作 `Key` 的哈希函数。它接受一个 `Key` 类型的参数，并返回一个 `std::size_t`. 类型的值。
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_Hash_
_Hash_
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_T_
_T_
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into the container from any `std::pair` object convertible to it, and it also must be https://en.cppreference.com/w/cpp/named_req/Erasable[Erasable^] from the container.
into the container from any `std::pair` object convertible to it, and it also must be从任何可转换为 `std::pair` 的对象构造并插入容器，并且还必须可以从容器中 https://en.cppreference.com/w/cpp/named_req/Erasable[Erasable^] from the container.可擦除^]。
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_Key_
_Key键_
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