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C++ forward_list::swap()用法及代码示例


forward_list::swap()是CPP STL中的内置函数,它与另一个forward_list交换第一个给定的forward_list的内容。

用法:

swap(forward_list first, forward_list second)
               or 
forward_list1.swap(forward_list second)

参数:该函数接受两个指定如下的参数:


  • first-第一个forward_list
  • second-第二个forward_list

返回值:该函数不返回任何内容。它交换两个列表。

下面的程序演示了上述函数:

程序1:

// CPP program that demonstrates the 
// forward_list::swap() function 
// when two parameters is passed 
#include <bits/stdc++.h> 
using namespace std; 
  
int main() 
{ 
    // initialising the two forward_list 
    forward_list<int> firstlist = { 9, 8, 7, 6 }; 
  
    forward_list<int> secondlist = { 10, 20, 30 }; 
  
    // printing elements before the swap operation 
    // for firstlist and secondlist 
    cout << "Before swap operation firstlist was:"; 
    for (auto it = firstlist.begin(); it != firstlist.end(); ++it) 
        cout << *it << " "; 
  
    cout << "\nBefore swap operation secondlist was:"; 
    for (auto it = secondlist.begin(); it != secondlist.end(); ++it) 
        cout << *it << " "; 
  
    // swap operation on two lists 
    swap(firstlist, secondlist); 
  
    // printing elements after the swap operation 
    // for forward1 and secondlist 
    cout << "\n\nAfter swap operation firstlist is:"; 
  
    for (auto it = firstlist.begin(); it != firstlist.end(); ++it) 
        cout << *it << " "; 
    cout << "\nAfter swap operation secondlist is:"; 
    for (auto it = secondlist.begin(); it != secondlist.end(); ++it) 
        cout << *it << " "; 
    return 0; 
}
输出:
Before swap operation firstlist was:9 8 7 6 
Before swap operation secondlist was:10 20 30 

After swap operation firstlist is:10 20 30 
After swap operation secondlist is:9 8 7 6

程序2:

// CPP program that demonstrates the 
// forward_list::swap() function 
// when two parameters is passed 
#include <bits/stdc++.h> 
using namespace std; 
  
int main() 
{ 
    // initialising the two forward_list 
    forward_list<int> firstlist = { 9, 8, 7, 6 }; 
  
    forward_list<int> secondlist = { 10, 20, 30 }; 
  
    // printing elements before the swap operation 
    // for firstlist and secondlist 
    cout << "Before swap operation firstlist was:"; 
    for (auto it = firstlist.begin(); it != firstlist.end(); ++it) 
        cout << *it << " "; 
  
    cout << "\nBefore swap operation secondlist was:"; 
    for (auto it = secondlist.begin(); it != secondlist.end(); ++it) 
        cout << *it << " "; 
  
    // swap operation on two lists 
    firstlist.swap(secondlist); 
  
    // printing elements after the swap operation 
    // for forward1 and secondlist 
    cout << "\n\nAfter swap operation firstlist is:"; 
  
    for (auto it = firstlist.begin(); it != firstlist.end(); ++it) 
        cout << *it << " "; 
    cout << "\nAfter swap operation secondlist is:"; 
    for (auto it = secondlist.begin(); it != secondlist.end(); ++it) 
        cout << *it << " "; 
    return 0; 
}
输出:
Before swap operation firstlist was:9 8 7 6 
Before swap operation secondlist was:10 20 30 

After swap operation firstlist is:10 20 30 
After swap operation secondlist is:9 8 7 6


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注:本文由纯净天空筛选整理自Twinkl Bajaj大神的英文原创作品 forward_list::swap() in C++ STL。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。