C++ Usage and example of List swap()

C++ List (List)

C ++ The List swap() function swaps two lists of the same type, but the size can be different.

Syntax

void swap(list& x);

Parameter

x:This is another list to be swapped with the given list.

Return value

It does not return any value.

Error:

An error will occur if the types of the two lists are not the same.

Example1

Let's look at a simple example where both lists have the same type and size.

Example

#include iostream>
#include<list>
using namespace std;
int main()
{
　　　
　　　　std::list<char> li={"+,-,*,",@",}
　　　　list<char> li1={'j','a','v','a'};
　　　　std::cout << "Initially, the content of list li is : ";
　　　　for(list<char> :: iterator itr=li.begin();itr!=li.end();++itr)
　　　　cout<<*itr;
　　　　std::cout << '\n' << "Initially, list li1The content is : ";
　　　　for(list<char> :: iterator itr=li1.begin();itr!=li1.end();++itr)
　　　　cout<<*itr;
　　　　li.swap(li1);
　　　　cout << '\n';
　　　　cout<<"After the swap, the content of list li is : ";
　　　　for(list<char> :: iterator itr=li.begin();itr!=li.end();++itr)
　　　　cout<<*itr;
　　　　cout << '\n';
　　　　cout<<"After the swap, list li1The content is : ";
　　　　for(list<char> :: iterator itr=li1.begin();itr!=li1.end();++itr)
　　　　cout<<*itr;
　　　　return 0;
}

Output:

Initially, the content of list li is :　+-*@
Initially, list li1The content is : java
After the swap, the content of list li is : java
After the swap, the content of list li1The content is :　+-*@

In this example, the swap() function will swap the contents of list li with list li1Swap.

Example2

Let's look at a simple example, when both lists are of different types.

Example

#include iostream>
#include<list>
using namespace std;
int main()
{
　　　std::list<char> li={'P','H','P'};
　　　　list<int> li1={1,2,3};
　　　　li.swap(li1);
　　　　cout << '\n';
　　　　return 0;
}

Output:

error : no matching call for list::swap(list&).

In this example, both lists are of different types. Therefore, the function swap() will cause an error, that is: list :: swap(list＆) does not have a matching call.

C++ List (List)