Template:cpp/container/deque/example empty
From cppreference.com
The following code uses empty to check if a std::deque<int> contains any elements:
Run this code
#include <deque>
#include <iostream>
int main()
{
std::deque<int> numbers;
std::cout << std::boolalpha;
std::cout << "Initially, numbers.empty(): " << numbers.empty() << '\n';
numbers.push_back(42);
numbers.push_back(13317);
std::cout << "After adding elements, numbers.empty(): " << numbers.empty() << '\n';
}
Output:
Initially, numbers.empty(): true
After adding elements, numbers.empty(): false