std::flat_map::empty(3)

okay so bestie, this is the std::flat_map::empty(3) page from the C++ Standard Libary manual — tiny page, big main character energy 💅✨

🎀 NAME 🎀

std::flat_map::empty - std::flat_map::empty — literally the name, no notes 😭💖

✨ Synopsis ✨

[[nodiscard]] bool empty() const noexcept;  (since C++23)

Checks if the underlying containers have no elements. Equivalent to return begin() == end();. 🫶

🌸 Parameters 🌸

(none) — not a single parameter, bestie 💀

💖 Return value 💖

true if the underlying containers are empty, false otherwise. Periodt. ✨

⚡ Complexity ⚡

Constant. ⚡ No drama, no scaling, just constant.

🦋 Example 🦋

The following code uses empty to check if a std::flat_map<int, int> contains any elements:

// Run this code

        #include <iostream>
        #include <flat_map>
        #include <utility>

        int main()
        {
            std::flat_map<int,int> numbers;
            std::cout << std::boolalpha;
            std::cout << "Initially, numbers.empty(): " << numbers.empty() <<
       '\n';

            numbers.emplace(42, 13);
            numbers.insert(std::make_pair(13317, 123));
            std::cout << "After adding elements, numbers.empty(): " <<
       numbers.empty() << '\n';
        }

🍓 Output 🍓

Initially, numbers.empty(): true
After adding elements, numbers.empty(): false

👑 See also 👑

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

mwah 💋 source/version/date: http://cppreference.com · 2024.06.10 · std::flat_map::empty(3) — that's the footer tea, bestie 🧚💜