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Returns:;; An iterator which refers to the past-the-end value for the container.
Returns:;; An iterator which refers to the past-the-end value for the container.返回：指向容器尾后值的迭代器。
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```c++ iterator end() noexcept; const_iterator end() const noexcept; ```
```c++ iterator end() noexcept; const_iterator end() const noexcept; ```
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end
end
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---
---
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Returns:;; An iterator referring to the first element of the container, or if the container is empty the past-the-end value for the container.
Returns:;; An iterator referring to the first element of the container, or if the container is empty the past-the-end value for the container.返回：指向容器第一个元素的迭代器，如果容器为空则返回容器的尾后迭代器。
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```c++ iterator begin() noexcept; const_iterator begin() const noexcept; ```
```c++ iterator begin() noexcept; const_iterator begin() const noexcept; ```
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begin
begin
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Iterators
Iterators迭代器
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Requires:;; `value_type` is https://en.cppreference.com/w/cpp/named_req/CopyInsertable[CopyInsertable^] into the container and https://en.cppreference.com/w/cpp/named_req/CopyAssignable[CopyAssignable^].
Requires:;; 要求：`value_type` is必须能够从容器中 https://en.cppreference.com/w/cpp/named_req/CopyInsertable[CopyInsertable^] into the container and可拷贝插入^] 并且满足 https://en.cppreference.com/w/cpp/named_req/CopyAssignable[CopyAssignable^].可拷贝赋值^]。
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Assign from values in initializer list. All existing elements are either overwritten by the new elements or destroyed.
Assign from values in initializer list. All existing elements are either overwritten by the new elements or destroyed.从初始化列表中的值进行赋值。所有现有元素要么被新元素覆盖，要么被销毁。
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```c++ unordered_map& operator=(std::initializer_list<value_type> il); ```
```c++ unordered_map&amp; operator=(std::initializer_list<value_type> il); ```</value_type>
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Initializer List Assignment
Initializer List Assignment初始化列表赋值
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---
---
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Requires:;; `value_type` is move constructible.
Requires:;; 要求：`value_type` is move constructible.可移动构造。
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If `Alloc::propagate_on_container_move_assignment` exists and `Alloc::propagate_on_container_move_assignment::value` is `true`, the allocator is overwritten, if not the moved elements are created using the existing allocator.
If如果 `Alloc::propagate_on_container_move_assignment` exists and存在且 `Alloc::propagate_on_container_move_assignment::value` is为 `true`, the allocator is overwritten, if not the moved elements are created using the existing allocator.，则分配器会被覆盖；否则，移动的元素将使用现有的分配器创建。
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```c++ unordered_map& operator=(unordered_map&& other) noexcept(boost::allocator_traits<Allocator>::is_always_equal::value && boost::is_nothrow_move_assignable_v<Hash> && boost::is_nothrow_move_assignable_v<Pred>); ``` The move assignment operator.
```c++ unordered_map&amp; operator=(unordered_map&&amp;&amp; other) noexcept(boost::allocator_traits<Aallocator>::is_always_equal::value &&amp;&amp; boost::is_nothrow_move_assignable_v<Hhash> &&amp;&amp; boost::is_nothrow_move_assignable_v<Ppred>); ``` The move assignment operator.</pred></hash></allocator>
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Move Assignment
Move Assignment移动赋值
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---
---
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Requires:;; `value_type` is copy constructible
Requires:;; 要求：`value_type` is copy constructible可拷贝构造。
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If `Alloc::propagate_on_container_copy_assignment` exists and `Alloc::propagate_on_container_copy_assignment::value` is `true`, the allocator is overwritten, if not the copied elements are created using the existing allocator.
If如果 `Alloc::propagate_on_container_copy_assignment` exists and存在且 `Alloc::propagate_on_container_copy_assignment::value` is为 `true`, the allocator is overwritten, if not the copied elements are created using the existing allocator.，则分配器会被覆盖；否则，拷贝的元素将使用现有的分配器创建。
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