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std::flat_map::keys(3) C++ Standard Libary std::flat_map::keys(3) NAME std::flat_map::keys - std::flat_map::keys Synopsis const key_container_type& keys() const noexcept; (since C++23) Return a constant reference to the adapted keys container. Equiva- lent to return c.keys;. Parameters (none) Return value The underlying keys container. Complexity Constant. 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) http://cppreference.com 2024.06.10 std::flat_map::keys(3)
NAME | Synopsis | Parameters | Return value | Complexity | Example | Output: | See also
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