std::array::empty(3)

🦋 std::array::empty(3) 🦋

okay so bestie, this is the C++ Standard Libary manual page for std::array::empty — and yes, the manual name is spelled “Libary” up there, so we’re keeping that energy exactly 💅.

✨ NAME ✨

std::array::empty - std::array::empty — iconic, redundant, we love her 🎀.

📜 Synopsis 📜

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

This one’s checking if the container has no elements, i.e. whether begin() == end() 👀.

🫶 Parameters 🫶

• (none) — literally no parameters here, bestie. not a single one 💀.

💖 Return value 💖

true if the container is empty, false otherwise. that’s the whole tea 🍓.

⚡ Complexity ⚡

Constant. no cap, constant complexity ✨.

🎀 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 (public member function) 🌸.
• empty — checks whether the container is empty (C++17) (function template) 🦋.

mwah 💋 this page is from http://cppreference.com, version/date 2024.06.10, and its title is std::array::empty(3) — go off and stay iconic 👑🌈.