std::vector::operator=

 

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std::vector

成员函数 Original: Member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

vector::vector

vector::~vector

vector::operator=

vector::assign

vector::get_allocator

元素的访问 Original: Element access The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

vector::at

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迭代器 Original: Iterators The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

vector::begin vector::cbegin （C++11）

vector::end vector::cend （C++11）

vector::rbegin vector::crbegin （C++11）

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容量 Original: Capacity The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

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修饰符 Original: Modifiers The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

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vector& operator=( const vector& other );	(1)
vector& operator=( vector&& other );	(2)	（C++11 起）

替换该容器的内容.

Original:

Replaces the contents of the container.

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1)

复制赋值操作者。与other的内容的副本的内容替换.

Original:

Copy assignment operator. Replaces the contents with a copy of the contents of other.

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2)

将赋值运算符。的other使用移动语义（即移动中的数据otherother到这个容器中）的内容替换。 other是有效的，但是未指定状态之后.

Original:

Move assignment operator. Replaces the contents with those of other using move semantics (i.e. the data in other is moved from other into this container). other is in valid, but unspecified state afterwards.

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参数

other

-

另一个容器被用作源 Original: another container to be used as source The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

返回值

*this

复杂性

1)

在所述容器的大小线性.

Original:

Linear in the size of the container.

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2)

恒定

Original:

Constant.

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为例

下面的代码使用：分配一个std::vector：

Original:

The following code uses to assign one std::vector to another:

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#include <vector>
#include <iostream>
 
void display_sizes(const std::vector<int> &nums1,
                   const std::vector<int> &nums2,
                   const std::vector<int> &nums3)
{
    std::cout << "nums1: " << nums1.size()
              << " nums2: " << nums2.size()
              << " nums3: " << nums3.size() << '\n';
}
 
int main()
{
    std::vector<int> nums1 {3, 1, 4, 6, 5, 9};
    std::vector<int> nums2;
    std::vector<int> nums3;
 
    std::cout << "Initially:\n";
    display_sizes(nums1, nums2, nums3);
 
    // copy assignment copies data from nums1 to nums2
    nums2 = nums1;
 
    std::cout << "After assigment:\n";
    display_sizes(nums1, nums2, nums3);
 
    // move assignment moves data from nums1 to nums3,
    // modifying both nums1 and nums3
    nums3 = std::move(nums1);
 
    std::cout << "After move assigment:\n";
    display_sizes(nums1, nums2, nums3);
}

Output:

Initially:
nums1: 4 nums2: 0 nums3: 0
After assigment:
nums1: 4 nums2: 4 nums3: 0
After move assigment:
nums1: 0 nums2: 4 nums3: 4

另请参阅

(constructor)	构建vector Original: constructs the vector The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. （公共成员函数）
assign	将值分配到容器中 Original: assigns values to the container The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. （公共成员函数）