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std::queue::empty(3) C++ Standard Libary std::queue::empty(3) NAME std::queue::empty - std::queue::empty Synopsis bool empty() const; (until C++20) [[nodiscard]] bool empty() const; (since C++20) Checks if the underlying container has no elements. Equivalent to return c.empty();. Parameters (none) Return value true if the underlying container is empty, false otherwise. Complexity Constant. Example // Run this code #include <algorithm> #include <iostream> #include <queue> int main() { std::cout << std::boolalpha; std::queue<int> queue; std::cout << "Initially, queue.empty(): " << queue.empty() << '\n'; queue.push(42); std::cout << "After adding elements, queue.empty(): " << queue.empty() << '\n'; } Output: Initially, queue.empty(): true After adding elements, queue.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::queue::empty(3)
NAME | Synopsis | Parameters | Return value | Complexity | Example | Output: | See also
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