std::unordered_multimap<Key,T,Hash,KeyEqual,Allocator>::size

From cppreference.com

 
 
 
 
size_type size() const noexcept;
(since C++11)

Returns the number of elements in the container, i.e. std::distance(begin(), end()).

Parameters

(none)

Return value

The number of elements in the container.

Complexity

Constant.

Example

The following code uses size to display the number of elements in a std::unordered_multimap:

#include <unordered_map>
#include <iostream>
 
int main()
{ 
    std::unordered_multimap<int,char> nums {{1, 'a'}, {3, 'b'}, {5, 'c'}, {7, 'd'}};
 
    std::cout << "nums contains " << nums.size() << " elements.\n";
}

Output:

nums contains 4 elements.

See also

(C++11)
checks whether the container is empty
(public member function)
(C++11)
returns the maximum possible number of elements
(public member function)
(C++17)(C++20)
returns the size of a container or array
(function template)