C++ Usage and example of Deque emplace_front()

C++ Deque (Double-ended Queue)

C ++ The emplace_front() function of the deque container adds a new element at the beginning of the container, and the size of the container increases by one.

Syntax

void emplace_front(value_type val);

Parameter

valInsert a new value at the beginning of the deque.

Return value

It does not return any value.

Example1

Let's look at a simple example

Example

#include<iostream>　　
#include<deque>　　
using namespace std;　　
int main()
{
　　dequefruit={"mango","banana"};
　　deque::iterator itr;
　　fruit.emplace_front("apple");
　　fruit.emplace_front("strawberry");
　　for(itr=fruit.begin();itr!=fruit.end();++itr)
　　std::cout <<　*itr << "  ";
　　　return 0;
}

Output:

strawberry apple mango banana

In this example, the emplace_front() function adds two strings, apple and strawberry, to the beginning of the deque.

C++ Deque (Double-ended Queue)