stl swap函數

C ++ vector :: swap()函數 (C++ vector::swap() function)

vector::swap() is a library function of "vector" header, it is used to swap the content of the vectors, it is called with a vector and accepts another vector as an argument and swaps their content. (Sizes of both of the vectors may differ).

vector :: swap()是“ vector”頭文件的庫函數，用于交換向量的內容，用向量調用它并接受另一個向量作為參數并交換其內容。 (兩個向量的大小可能不同)。

Note: To use vector, include <vector> header.

注意：要使用向量，請包含<vector>標頭。

Syntax of vector::swap() function

vector :: swap()函數的語法

    vector::swap(vector& v);

Parameter(s): v – It is another vector to be swapped content with current vector.

參數： v –這是另一個要與當前向量交換內容的向量。

Return value: void – It returns nothing.

返回值： void –不返回任何內容。

Example:

例：

    Input:
vector<int> v1{ 10, 20, 30, 40, 50 };
vector<int> v2{ 100, 200, 300 };
//swapping content of the vectors
v1.swap(v2);
Output:
//if we print the values
v1: 100 200 300
v2: 10 20 30 40 50

C ++程序演示vector :: swap()函數的示例 (C++ program to demonstrate example of vector::swap() function)

//C++ STL program to demonstrate example of
//vector::erase() function
#include <iostream>
#include <vector>
using namespace std;
int main()
{
//vector declaration
vector<int> v1{ 10, 20, 30, 40, 50 };
vector<int> v2{ 100, 200, 300 };
//printing the sizes and values of the vectors
cout << "before swap() call..." << endl;
cout << "size of v1: " << v1.size() << endl;
cout << "size of v2: " << v2.size() << endl;
cout << "v1: ";
for (int x : v1)
cout << x << " ";
cout << endl;
cout << "v2: ";
for (int x : v2)
cout << x << " ";
cout << endl;
//swapping the content of the vectors
v1.swap(v2);
//printing the sizes and values of the vectors
cout << "after swap() call..." << endl;
cout << "size of v1: " << v1.size() << endl;
cout << "size of v2: " << v2.size() << endl;
cout << "v1: ";
for (int x : v1)
cout << x << " ";
cout << endl;
cout << "v2: ";
for (int x : v2)
cout << x << " ";
cout << endl;
return 0;
}

Output

輸出量

before swap() call...
size of v1: 5
size of v2: 3
v1: 10 20 30 40 50
v2: 100 200 300
after swap() call...
size of v1: 3
size of v2: 5
v1: 100 200 300
v2: 10 20 30 40 50

Reference: C++ vector::swap()

參考： C ++ vector :: swap()

翻譯自: https://www.includehelp.com/stl/vector-swap-function-with-example.aspx

stl swap函數