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emplace vs insert in C++ STL
emplace operation avoids unnecessary copy of object and does the insertion more efficiently than insert operation. Insert operation takes a reference to an object.
Algorithm
Begin Declare set. Use emplace() to insert pair. Use insert() to insert pair by using emplace(). Print the set. End
Example Code
#include<bits/stdc++.h> using namespace std; int main() { set<pair<int, char>> s; s.emplace(7, 'a'); s.insert(make_pair(6, 'b')); for (auto it = s.begin(); it != s.end(); ++it) cout << " " << (*it).first << " " << (*it).second << endl; return 0; }
Output
7 a 6 b
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