FreeBSD Manual Pages
std::flat_map::extract(3) C++ Standard Libary std::flat_map::extract(3) NAME std::flat_map::extract - std::flat_map::extract Synopsis containers extract() &&; (since C++23) Extracts adapted containers c. Equivalent to return std::move(c);. After this operation *this is empty, even if an exception is thrown. Parameters (none) Return value std::move(c). Complexity Constant. Example // Run this code #include <cassert> #include <flat_map> #include <print> #include <type_traits> #include <vector> int main() { std::flat_map<int, double> map{{1, 1.1}, {2, 2.2}, {3, 3.3}}; const auto size = map.size(); auto c = map.extract(); assert(c.keys.size() == size); assert(c.values.size() == size); assert(map.empty()); assert(map.keys().empty()); assert(map.values().empty()); // The default keys and values containers are std::vector: static_assert(std::is_same_v<decltype(c.keys), std::vector<int>>); static_assert(std::is_same_v<decltype(c.value), std::vec- tor<int>>); std::println("keys: {}", c.keys); std::println("values: {}", c.values); } Output: keys: [1, 2, 3] values: [1.1, 2.2, 3.3] See also replace replaces the underlying containers (public member function) http://cppreference.com 2024.06.10 std::flat_map::extract(3)
NAME | Synopsis | Parameters | Return value | Complexity | Example | Output: | See also
Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=std::flat_map::extract&sektion=3&manpath=FreeBSD+Ports+15.1.quarterly>