std::array<T,N>::empty - cppreference.com
From cppreference.com
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(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:
#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
| returns the number of elements (public member function) [edit] | |
| checks whether the container is empty (function template) [edit] |