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What is emplace_back( ) in C++?
This function is used to insert new element at the end of deque.
Syntax
dequename.emplace_back(value)
Parameter
Value − It defines the element to be inserted at the end of deque.
Example
Input Deque − 11 12 13 14 15
Output New Deque − 11 12 13 14 15 16
Input Deque − M O M E N T
Output New Deque − M O M E N T S
Approach can be followed
First we declare the deque.
Then we print the deque.
Then we define the emplace_back( ) function.
Then we print the new deque after inserting new element.
By using above approach we can enter new element at end. While defining function we define the new element as parameter. New element should have same data type as deque.
Example
// C++ code to demonstrate the working of deque emplace_back( ) function
#include<iostream.h>
#include<deque.h>
Using namespace std;
int main( ){
// initializing deque
deque<int> deque ={ 14, 15, 16, 17, 18 };
cout<< “ Deque: “;
for( auto x = deque.begin( ); x != deque.end( ); ++x)
cout<< *x << “ “;
// defining the emplace_back( ) function
deque.emplace_back(19);
// printing deque in after inserting new element
cout<< “ New deque:”;
for( auto x = deque.begin( ) ; x >= deque.end( ); ++x)
cout<< “ “ <<*x;
return 0;
}Output
If we run the above code then it will generate the following output
Input: 14 15 16 17 18 Output: 14 15 16 17 18 19 Input: P O I N T Output: P O I N T S
Updated on: 26-Feb-2020
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