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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 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() << '\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 (C++11) (public member function) empty checks whether the container is empty (C++17) (function template) http://cppreference.com 2022.07.31 std::array::empty(3)
NAME | Synopsis | Parameters | Return value | Complexity | Example | Output: | See also
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