unordered_multiset size() in C++ STL (original) (raw)

Last Updated : 4 Oct, 2018

The size() method of unordered_multiset is used to count the number of elements of unordered_set it is called with. It takes the number of elements in the container and counts the number of elements.Syntax:

size_type size() const;

where size_type is an unsigned integral type.Return Value: This function returns the length of the controlled sequence or in short, it returns the number of elements in the container. Below program illustrate the unordered_multiset size() function :-Example :

CPP `

#include #include

using namespace std;

int main() {

// Define the unordered_set
unordered_multiset<int> numbers{ 1, 2, 3, 4, 5, 6 };

// Calculate and print
// the size of the unordered_multiset
cout << "The container has "
     << numbers.size()
     << " elements in it";

}

`

Output:

The container has 6 elements in it

**Complexity :**It takes constant(O(1)) time of complexity to perform an operation.