unordered_multiset emplace() function in C++ STL
The unordered_multiset::emplace() is a built-in function in C++ STL which inserts a new element in the unordered_multiset container. The insertion is done automatically at the position according to the container’s criterion. It increases the size of the container by one.
Syntax:
unordered_multiset_name.emplace(val)
Parameters: The function accepts a single mandatory parameter val which is to be inserted in the container.
Return Value: It returns an iterator which points to the newly inserted element.
Below programs illustrates the above function:
Program 1:
// C++ program to illustrate the // unordered_multiset::emplace() function #include <bits/stdc++.h> using namespace std; int main() { // declaration unordered_multiset< int > sample; // inserts element using emplace() sample.emplace(11); sample.emplace(11); sample.emplace(11); sample.emplace(12); sample.emplace(13); sample.emplace(13); sample.emplace(14); cout << "Elements: " ; for ( auto it = sample.begin(); it != sample.end(); it++) cout << *it << " " ; return 0; } |
Output:
Elements: 14 11 11 11 12 13 13
Program 2:
// C++ program to illustrate the // unordered_multiset::emplace() function #include <bits/stdc++.h> using namespace std; int main() { // declaration unordered_multiset< char > sample; // inserts element using emplace() sample.emplace( 'a' ); sample.emplace( 'a' ); sample.emplace( 'a' ); sample.emplace( 'b' ); sample.emplace( 'b' ); sample.emplace( 'c' ); sample.emplace( 'd' ); cout << "Elements: " ; for ( auto it = sample.begin(); it != sample.end(); it++) cout << *it << " " ; return 0; } |
Output:
Elements: d a a a b b c
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