std::vector::swap
void swap( vector& other ); | | (until C++17) |
|---|---|---|
void swap( vector& other ) noexcept(/* see below */); | | (since C++17) |
将容器的内容与other不对单个元素调用任何移动、复制或交换操作。
所有迭代器和引用仍然有效。过去的迭代器无效.
If std::allocator_traits<allocator_type>::propagate_on_container_swap::value is true, then the allocators are exchanged using an unqualified call to non-member swap. Otherwise, they are not swapped (and if get_allocator() != other.get_allocator(), the behavior is undefined). | (since C++11) |
|---|
参数
other | - | container to exchange the contents with |
|---|
返回值
%280%29
例外
(none). | (until C++17) |
|---|---|
noexcept specification: noexcept(std::allocator_traits<Allocator>::propagate_on_container_swap::value || std::allocator_traits<Allocator>::is_always_equal::value) | (since C++17) |
复杂性
常量。
另见
std::swap(std::vector) | specializes the std::swap algorithm (function template) |
|---|
例
二次
#include <vector>
#include <iostream>
void printVector(std::vector<int>& vec)
{
for (int a : vec)
{
std::cout << a << " ";
}
}
int main()
{
std::vector<int> v1{1, 2, 3};
std::vector<int> v2{7, 8, 9};
std::cout << "v1: ";
printVector(v1);
std::cout << "\nv2: ";
printVector(v2);
std::cout << "\n-- SWAP\n";
v2.swap(v1);
std::cout << "v1: ";
printVector(v1);
std::cout << "\nv2: ";
printVector(v2);
}二次
产出：
二次
v1: 1 2 3
v2: 7 8 9
-- SWAP
v1: 7 8 9
v2: 1 2 3二次
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