forward_list::swap()是CPP STL中的內置函數，它與另一個forward_list交換第一個給定的forward_list的內容。
用法:
swap(forward_list first, forward_list second)
or
forward_list1.swap(forward_list second)
參數：該函數接受兩個指定如下的參數：
- first-第一個forward_list
- second-第二個forward_list
返回值：該函數不返回任何內容。它交換兩個列表。
下麵的程序演示了上述函數：
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;
}
輸出：
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;
}
輸出：
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
相關用法
注：本文由純淨天空篩選整理自Twinkl Bajaj大神的英文原創作品 forward_list::swap() in C++ STL。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。