C++ valarray swap()用法及代码示例

swap()函数在valarray头文件中定义。此函数用于将一个valarray的内容与另一个valarray交换。

用法:

void swap( valarray& valarray2 );

参数：此方法接受一个参数valarray2，该参数表示另一个valarray，我们必须使用该valarray交换旧的valarray。

返回值：此函数不返回任何内容。

以下示例程序旨在说明上述函数：

示例1：

// C++ program to demonstrate 
// example of swap() function. 
  
#include <bits/stdc++.h> 
using namespace std; 
  
int main() 
{ 
    // Initializing 1st valarray 
    valarray<int> varr1 = { 12, 24, 36, 48 }; 
  
    // Initializing 2nd valarray 
    valarray<int> varr2 = { 20, 40, 60, 80 }; 
  
    varr1.swap(varr2); 
  
    // Displaying valarrays after swapping 
    cout << "The contents of 1st valarray "
            "after swapping are : "; 
  
    for (int& x : varr1) 
        cout << x << " "; 
  
    cout << endl; 
  
    cout << "The contents of 2nd valarray "
            "after swapping are : "; 
  
    for (int& x : varr2) 
        cout << x << " "; 
  
    cout << endl; 
  
    return 0; 
}

输出：

The contents of 1st valarray after swapping are : 20 40 60 80 
The contents of 2nd valarray after swapping are : 12 24 36 48

示例2：

// C++ program to demonstrate 
// example of swap() function. 
  
#include <bits/stdc++.h> 
using namespace std; 
  
int main() 
{ 
    // Initializing 1st valarray 
    valarray<int> varr1 = { -12, -24, -36, -48 }; 
  
    // Initializing 2nd valarray 
    valarray<int> varr2 = { 20, 40, 60, 80 }; 
  
    varr1.swap(varr2); 
  
    // Displaying valarrays after swapping 
    cout << "The contents of 1st valarray "
            "after swapping are : "; 
  
    for (int& x : varr1) 
        cout << x << " "; 
  
    cout << endl; 
  
    cout << "The contents of 2nd valarray "
            "after swapping are : "; 
  
    for (int& x : varr2) 
        cout << x << " "; 
  
    cout << endl; 
  
    return 0; 
}

输出：

The contents of 1st valarray after swapping are : 20 40 60 80 
The contents of 2nd valarray after swapping are : -12 -24 -36 -48

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注：本文由纯净天空筛选整理自bansal_rtk_大神的英文原创作品 valarray swap() function in c++。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。