home | help 
std::array::empty(3)	       C++ Standard Libary	    std::array::empty(3)

NAME
     std::array::empty - std::array::empty

Synopsis
	constexpr bool empty() const noexcept;		      (since C++11)
							      (until C++20)
	[[nodiscard]] constexpr bool empty() const noexcept;  (since C++20)

	Checks if the container has no elements, i.e. whether begin() == end().

Parameters
	(none)

Return value
	true if the container is empty, false otherwise.

Complexity
	Constant.

Example
	The following code uses empty to check if a std::array contains any ele-
     ments:

     // Run this code

      #include <array>
      #include <iostream>

      int main()
      {
	  std::array<int, 4> numbers{3, 1, 4, 1};
	  std::array<int, 0> no_numbers;

	  std::cout << std::boolalpha;
	  std::cout << "numbers.empty(): " << numbers.empty() << '\n';
	  std::cout << "no_numbers.empty(): " << no_numbers.empty() << '\n';
      }

Output:
      numbers.empty(): false
      no_numbers.empty(): true

See also
	size	returns the number of elements
		(public member function)
	empty	checks whether the container is empty
	(C++17) (function template)

http://cppreference.com 	   2024.06.10		    std::array::empty(3)
home | help