std::flat_map::keys(3)

✨ NAME ✨

okay so this page is std::flat_map::keys — literally std::flat_map::keys — from the C++ Standard Libary manual, and it’s here to hand you the keys container, bestie. 💖

🌸 Synopsis 🌸

const key_container_type& keys() const noexcept;  (since C++23)

Return a constant reference to the adapted keys container. Equivalent to return c.keys;. ✨

🎀 Parameters 🎀

(none) — no params, no stress, we love that for us. 🫶

💜 Return value 💜

The underlying keys container. That’s the whole vibe. 👑

🔥 Complexity 🔥

Constant. periodt. ⭐

🦋 Example 🦋

Run this code 👇

        #include <flat_map>
        #include <print>
        #include <type_traits>
        #include <vector>

        int main()
        {
            std::flat_map<int, double> adaptor{{1, 1.1}, {2, 2.2}, {3, 3.3}};

            // The default keys container is std::vector:
            static_assert(std::is_same_v<decltype(adaptor.keys()), const
       std::vector<int>&>);

            std::println("{}", adaptor.keys());
        }

Output 💬

        [1, 2, 3]

🌈 See also 🌈

• values — direct access to the underlying values container (public member function). 💅

made with 💖 from http://cppreference.com, version/date 2024.06.10, on the std::flat_map::keys(3) page — byeee 🎀