home | help 
std::unordered_map::size(3)    C++ Standard Libary   std::unordered_map::size(3)

NAME
     std::unordered_map::size - std::unordered_map::size

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

	Returns  the number of elements in the container, i.e. std::distance(be-
     gin(), 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_map:

     // Run this code

      #include <iostream>
      #include <unordered_map>

      int main()
      {
	  std::unordered_map<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
	empty	 checks whether the container is empty
		 (public member function)
	max_size returns the maximum possible number of elements
		 (public member function)
	size
	ssize	 returns the size of a container or array
	(C++17)  (function template)
	(C++20)

http://cppreference.com 	   2024.06.10	     std::unordered_map::size(3)
home | help