unordered_multiset size() in C++ STL
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 :
#include <iostream> #include <unordered_set> 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.
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