std::array<T,N>::empty
From cppreference.com
constexpr bool empty() const noexcept;
|
(since C++11) | |
Checks if the container has no elements, i.e. whether begin() == end().
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 elements:
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