std::vector::empty

#include <vector>
#include <iostream>
 
int main()
{
    std::cout << std::boolalpha;
    std::vector<int> numbers;
    std::cout << " , numbers.empty(): " << numbers.empty() << '\n';

    numbers.push_back(42);
    std::cout << "  , numbers.empty(): " << numbers.empty() << '\n';
}