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:1711
English
Notes:;; Behavior is undefined if the two containers don't have equivalent equality predicates.
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Similar to `rehash`, this function can be used to grow or shrink the number of buckets in the container.
与 `rehash` 类似，此函数可用于增加或减少容器中桶的数量。
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Invalidates iterators, and changes the order of elements. Pointers and references to elements are not invalidated.
使迭代器失效，并改变元素的顺序。指向元素的指针和引用不会失效。
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Throws:;; The function has no effect if an exception is thrown, unless it is thrown by the container's hash function or comparison function.
抛出：;; 如果抛出异常（除非是由容器的哈希函数或比较函数抛出），则该函数无效。
Deduction Guides
推导指引
A deduction guide will not participate in overload resolution if any of the following are true:
在以下任一条件成立时，推导指引将不参与重载决议：
- It has an `InputIterator` template parameter and a type that does not qualify as an input iterator is deduced for that parameter. - It has an `Allocator` template parameter and a type that does not qualify as an allocator is deduced for that parameter. - It has a `Hash` template parameter and an integral type or a type that qualifies as an allocator is deduced for that parameter. - It has a `Pred` template parameter and a type that qualifies as an allocator is deduced for that parameter.
- 它具有 `InputIterator` 模板参数，并且为该参数推导出的类型不符合输入迭代器的要求。
- 它具有 `Allocator` 模板参数，并且为该参数推导出的类型不符合分配器的要求。
- 它具有 `Hash` 模板参数，并且为该参数推导出的是整数类型或符合分配器要求的类型。
- 它具有 `Pred` 模板参数，并且为该参数推导出的是符合分配器要求的类型。
A `size_­type` parameter type in a deduction guide refers to the `size_­type` member type of the container type deduced by the deduction guide. Its default value coincides with the default value of the constructor selected.
推导指引中的 `size_type` 参数类型指向由该推导指引所推导出的容器类型的 `size_type` 成员类型。其默认值与所选构造函数的默认值一致。
__iter-value-type__
_iter-value-type_
__iter-key-type__
__iter-key-type__
__iter-mapped-type__
__iter-mapped-type__
__iter-to-alloc-type__
__iter-to-alloc-type__
Equality Comparisons
相等性比较
operator
operator
```c++ template<class Key, class T, class Hash, class Pred, class Alloc> bool operator==(const unordered_map<Key, T, Hash, Pred, Alloc>& x, const unordered_map<Key, T, Hash, Pred, Alloc>& y); ```
```c++ template<class key,="" class="" t,="" hash,="" pred,="" alloc=""> bool operator==(const unordered_map<key, t,="" hash,="" pred,="" alloc="">&amp; x, const unordered_map<key, t,="" hash,="" pred,="" alloc="">&amp; y); ```</key,></key,></class>
Return `true` if `x.size() == y.size()` and for every element in `x`, there is an element in `y` with the same key, with an equal value (using `operator==` to compare the value types).
如果 `x.size() == y.size()` 并且对于 `x` 中的每个元素，在 `y` 中都有一个具有相同键且值相等的元素（使用 `operator==` 比较值类型），则返回 `true`。
:1711
Notes:;; Behavior is undefined if the two containers don't have equivalent equality predicates.
备注：;; 如果两个容器不具有等价的相等谓词，则行为未定义。
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operator!
operator!
```c++ template<class Key, class T, class Hash, class Pred, class Alloc> bool operator!=(const unordered_map<Key, T, Hash, Pred, Alloc>& x, const unordered_map<Key, T, Hash, Pred, Alloc>& y); ```
```c++ template<class key,="" class="" t,="" hash,="" pred,="" alloc=""> bool operator!=(const unordered_map<key, t,="" hash,="" pred,="" alloc="">&amp; x, const unordered_map<key, t,="" hash,="" pred,="" alloc="">&amp; y); ```</key,></key,></class>
Return `false` if `x.size() == y.size()` and for every element in `x`, there is an element in `y` with the same key, with an equal value (using `operator==` to compare the value types).
如果 `x.size() == y.size()` 并且对于 `x` 中的每个元素，在 `y` 中都有一个具有相同键且值相等的元素（使用 `operator==` 比较值类型），则返回 `false`。
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Notes:;; Behavior is undefined if the two containers don't have equivalent equality predicates.
备注：;; 如果两个容器不具有等价的相等谓词，则行为未定义。
Swap
交换
```c++ template<class Key, class T, class Hash, class Pred, class Alloc> void swap(unordered_map<Key, T, Hash, Pred, Alloc>& x, unordered_map<Key, T, Hash, Pred, Alloc>& y) noexcept(noexcept(x.swap(y))); ```
```c++ template<class key,="" class="" t,="" hash,="" pred,="" alloc=""> void swap(unordered_map<key, t,="" hash,="" pred,="" alloc="">&amp; x, unordered_map<key, t,="" hash,="" pred,="" alloc="">&amp; y) noexcept(noexcept(x.swap(y))); ```</key,></key,></class>
Swaps the contents of `x` and `y`.
交换 `x` 和 `y` 的内容。
:1737
If `Allocator::propagate_on_container_swap` is declared and `Allocator::propagate_on_container_swap::value` is `true` then the containers' allocators are swapped. Otherwise, swapping with unequal allocators results in undefined behavior.
如果 `Allocator::propagate_on_container_swap` 已声明且 `Allocator::propagate_on_container_swap::value` 为 `true`，则交换两个容器的分配器。否则，使用不相等的分配器进行交换将导致未定义行为。
Effects:;; `x.swap(y)` Throws:;; Doesn't throw an exception unless it is thrown by the copy constructor or copy assignment operator of `key_equal` or `hasher`. Notes:;; The exception specifications aren't quite the same as the C++11 standard, as the equality predicate and hash function are swapped using their copy constructors.
效果：;; `x.swap(y)`
抛出：;; 除非由 `key_equal` 或 `hasher` 的复制构造函数或复制赋值运算符抛出异常，否则不会抛出异常。
备注：;; 异常规范与 C++11 标准不完全相同，因为相等谓词和哈希函数是通过它们的复制构造函数进行交换的。
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erase_if
erase_if
```c++ template<class K, class T, class H, class P, class A, class Predicate> typename unordered_map<K, T, H, P, A>::size_type erase_if(unordered_map<K, T, H, P, A>& c, Predicate pred); ```
```c++ template<class k,="" class="" t,="" h,="" p,="" a,="" predicate=""> typename unordered_map<k, t,="" h,="" p,="" a="">::size_type erase_if(unordered_map<k, t,="" h,="" p,="" a="">&amp; c, Predicate pred); ```</k,></k,></class>
Traverses the container `c` and removes all elements for which the supplied predicate returns `true`.
遍历容器 `c` 并移除所有使给定谓词返回 `true` 的元素。
Returns:;; The number of erased elements. Notes:;; Equivalent to: + + ```c++ auto original_size = c.size(); for (auto i = c.begin(), last = c.end(); i != last; ) { if (pred(*i)) { i = c.erase(i); } else { ++i; } } return original_size - c.size(); ``` + Note that the references passed to `pred` are non-const.
返回：;; 被移除的元素数量。备注：;; 等价于：```c++auto original_size = c.size();for (auto i = c.begin(), last = c.end(); i != last; ) { if (pred(*i)) { i = c.erase(i); } else { ++i; }}return original_size - c.size();```注意，传递给 `pred` 的引用是非常量的。
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cbegin
cbegin
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cend
cend
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Invalidates iterators, and changes the order of elements. Pointers and references to elements are not invalidated.
使迭代器失效，并改变元素的顺序。指向元素的指针和引用不会失效。
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Throws:;; The function has no effect if an exception is thrown, unless it is thrown by the container's hash function or comparison function.
抛出：;; 如果抛出异常（除非是由容器的哈希函数或比较函数抛出），则该函数无效。
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Invalidates iterators, and changes the order of elements. Pointers and references to elements are not invalidated.
使迭代器失效，并改变元素的顺序。指向元素的指针和引用不会失效。
:1652
Throws:;; The function has no effect if an exception is thrown, unless it is thrown by the container's hash function or comparison function.
抛出：;; 如果抛出异常（除非是由容器的哈希函数或比较函数抛出），则该函数无效。
:1711
Notes:;; Behavior is undefined if the two containers don't have equivalent equality predicates.
备注：;; 如果两个容器不具有等价的相等谓词，则行为未定义。
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Notes:;; Behavior is undefined if the two containers don't have equivalent equality predicates.
备注：;; 如果两个容器不具有等价的相等谓词，则行为未定义。
:1737
If `Allocator::propagate_on_container_swap` is declared and `Allocator::propagate_on_container_swap::value` is `true` then the containers' allocators are swapped. Otherwise, swapping with unequal allocators results in undefined behavior.
如果 `Allocator::propagate_on_container_swap` 已声明且 `Allocator::propagate_on_container_swap::value` 为 `true`，则交换两个容器的分配器。否则，使用不相等的分配器进行交换将导致未定义行为。
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The iterator category is at least a forward iterator.
迭代器类别至少为前向迭代器。
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The iterator category is at least a forward iterator.
迭代器类别至少为前向迭代器。
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Translation uploaded
Notes:;; Behavior is undefined if the two containers don't have equivalent equality predicates.
Notes:;; Behavior is undefined if the two containers don't have equivalent equality predicates.备注：;; 如果两个容器不具有等价的相等谓词，则行为未定义。
:1711
06/05/2026
User avatar admin

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Notes:;; Behavior is undefined if the two containers don't have equivalent equality predicates.
Notes:;; Behavior is undefined if the two containers don't have equivalent equality predicates.
:1711
06/05/2026
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String information

Key
:1711
Flags
safe-html, strict-same
Unit identifier
55839
Source string location
:1711
String age
06/05/2026
Last updated
06/06/2026
Source string age
06/05/2026
Translation file AsciiDoc file
doc/modules/ROOT/pages/reference/unordered_map_zh_Hans.adoc, string 457