C++ List emplace_back() Usage and Example

C++ List (List)

C ++ The emplace_back() function of the list inserts a new element at the end of the list, and the size of the list increases by one.

The following figure shows the working principle of this function:

Syntax

void　emplace_back(value_type　val);

Parameter

val：The new value to be inserted at the end of the 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()
{
　　listli={1,2,3,4};
　　list::iterator itr;
　　li.emplace_back(5);
　for(itr=li.begin();itr!=li.end();++itr)
　　cout<<*itr<<"　";
　　return 0;
　}

Output:

1　2　3　4　5

In this example, the emplace_back() function adds a new element at the end of the list, namely5.

Example2

Let's look at a simple example

Example

#include　<iostream>　　
#include<list>　　
using namespace std;　　
int main()
{
listli={'C','+};
list::iterator itr;
for(itr=li.begin();itr!=li.end();++itr)
std::cout <<　*itr;
cout << '\n';
li.emplace_back('+');
for(itr=li.begin();itr!=li.end();++itr)
std::cout <<　*itr;
　return 0;
}

Output:

C+
C++

In this example, the emplace_back() function adds a new character at the end of the list, that is, " +

C++ List (List)