Adding to a vector of pair

Question

I have a vector of pair like such:

vector> revenue;

I want to add a string and a doub

Answer 1

Using emplace_back function is way better than any other method since it creates an object in-place of type T where vector, whereas push_back expects an actual value from you.

vector> revenue;

// make_pair function constructs a pair objects which is expected by push_back
revenue.push_back(make_pair("cash", 12.32));

// emplace_back passes the arguments to the constructor
// function and gets the constructed object to the referenced space
revenue.emplace_back("cash", 12.32);