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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.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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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).
Return `true` if如果 `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).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`。
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```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 Kkey,="" class T, class Hash, class Pred, class A="" t,="" hash,="" pred,="" alloc=""> bool operator==(const unordered_map<Kkey, T, Hash, Pred, Alloc>&t,="" hash,="" pred,="" alloc="">&amp; x, const unordered_map<Kkey, T, Hash, Pred, Alloc>& y); ```t,="" hash,="" pred,="" alloc="">&amp; y); ```</key,></key,></class>
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operator
operator
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Equality Comparisons
Equality Comparisons相等性比较
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__iter-to-alloc-type__
__iter-to-alloc-type__
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__iter-mapped-type__
__iter-mapped-type__
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__iter-key-type__
__iter-key-type__
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__iter-value-type__
__iter-value-type__
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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.
A推导指引中的 `size_­type` parameter type in a deduction guide refers to the参数类型指向由该推导指引所推导出的容器类型的 `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.成员类型。其默认值与所选构造函数的默认值一致。
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- 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.
- It has an它具有 `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.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。
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A deduction guide will not participate in overload resolution if any of the following are true:
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：
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Deduction Guides
Deduction Guides推导指引
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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.
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.
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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Similar to `rehash`, this function can be used to grow or shrink the number of buckets in the container.
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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Equivalent to `a.rehash(ceil(n / a.max_load_factor()))`, or `a.rehash(1)` if `n > 0` and `a.max_load_factor() == std::numeric_limits<float>::infinity()`.
Equivalent to等价于 `a.rehash(ceil(n / a.max_load_factor()))`, or `a.rehash(1)` if `n >；如果 `n &gt; 0` and且 `a.max_load_factor() == std::numeric_limits<float>::infinity()`.，则等价于 `a.rehash(1)`。</float>
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```c++ void reserve(size_type n); ```
```c++ void reserve(size_type n); ```
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reserve
reserve保留
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---
---
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