emplace
This is a new feature in C++11 to add the element in container(like stack, list, forward list) constructed from arguments.
It has many API, few of them are:
- emplace(itr, value); //Add the element at given position, need to pass iterator(position) and value
- emplace_front(value); //Add the element at first position, need to pass value
- emplace_back(value); //Add the element at last position, need to pass value
Example:
std::list<std::string> lst;
lst.emplace_front("three"); //Add at first
lst.emplace(lst.begin(), "four"); //Add at first, position is first
lst.emplace_back("five"); //Add at last
source code with example:
/*
Program: Emplace
Author: Alpha Master
Date: 13 March 2021
*/
//Header File
#include<iostream>
#include<list>
void display(const std::list<std::string>& tmpList)
{
for(auto a: tmpList)
{
std::cout<<a<<std::endl;
}
return;
}
int main()
{
std::cout<<"Emplace"<<std::endl;
std::list<std::string> lst;
lst.push_back("one");
lst.push_back("two");
lst.emplace_front("three"); //Add at first
lst.emplace(lst.begin(), "four"); //Add at first
lst.emplace_back("five"); //Add at last
display(lst);
return 0;
}
Output:
Emplace four three one two five