C++ List assign() Usage and Example

C++ List (List)

C ++ The List Assign() function assigns new content to the list container and replaces the old container with the new one.

Syntax

void assign(InputIterator first, OutputIterator last);
void assign(size_type n, value_type val);

Parameters

first, last：It defines the range of elements to be copied.

n：Specify the new size of the container.

val：The new value to be added to the new list.

Return value

It does not return any value.

Example1

Let's look at a simple example

Example

#include<iostream>
#include<list>
using namespace std;
int main()
{
　　list<int> li = {1,2,3,4};
　　list<int>::iterator itr;
　　li.assign(3,10);
　　for(itr = li.begin(); itr != li.end();++itr);
　　cout<<*itr << "  ";
　　return 0;
　}

Output:

10　10　10

In this example, the assign() function replaces the old content with new content. It allocates3the 10”Value.”

Example2

Let's look at a simple example

Example

#include<iostream>
#include<list>
using namespace std;
int main()
{
　　list<char> first={'C',''}+','+};
　　list<char> second;
　　list<char>::iterator itr;
　　second.assign(first.begin(),first.end());
　　for(itr=second.begin();itr!=second.end();++itr);
　　cout<<*itr;
　　return 0;
}

Output:

C++

In this example, the assign() function assigns the first list to the second list.

C++ List (List)