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std::flat_multimap::empty(3) C++ Standard Libary std::flat_multimap::empty(3) NAME std::flat_multimap::empty - std::flat_multimap::empty Synopsis [[nodiscard]] bool empty() const noexcept; (since C++23) Checks if the underlying containers have no elements. Equivalent to return begin() == end();. Parameters (none) Return value true if the underlying containers are empty, false otherwise. Complexity Constant. Example The following code uses empty to check if a std::flat_multimap<int, int> contains any elements: // Run this code #include <iostream> #include <flat_map> #include <utility> int main() { std::flat_multimap<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(): " << num- bers.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) http://cppreference.com 2024.06.10 std::flat_multimap::empty(3)
NAME | Synopsis | Parameters | Return value | Complexity | Example | Output: | See also
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