在C++ STL中的SWAPD:List:-yiteyi-C++库

这个 转发列表：：交换（） 是CPP STL中的一个内置函数，它将第一个给定转发列表的内容与另一个转发列表交换。

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语法：

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

参数： 该函数接受以下两个参数：

第一 –第一个转发列表
第二 –第二个转发列表

返回值： 该函数不返回任何内容。它交换了两份名单。

以下程序演示了上述功能：

项目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 <<                               "Before 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 <<                               "After swap operation firstlist is: "                               ;                   
                             
                                         for                               (                               auto                               it = firstlist.begin(); it != firstlist.end(); ++it)                   
                                         cout << *it <<                               " "                               ;                   
                                         cout <<                               "After 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

项目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 <<                               "Before 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 <<                               "After swap operation firstlist is: "                               ;                   
                             
                                         for                               (                               auto                               it = firstlist.begin(); it != firstlist.end(); ++it)                   
                                         cout << *it <<                               " "                               ;                   
                                         cout <<                               "After 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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