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Showing content from https://en.cppreference.com/w/cpp/language/../error/error_code/../../container/vector/empty.html below:

std::vector<T,Allocator>::empty - cppreference.com

bool empty() const;

Checks if the container has no elements.

true if the container is empty, false otherwise.

Constant.

#include <iostream>
#include <vector>
 
int main()
{
    std::cout << std::boolalpha;
 
    std::vector<int> numbers;
    std::cout << "Initially, numbers.empty(): " << numbers.empty() << '\n';
 
    numbers.push_back(42);
    std::cout << "After adding elements, numbers.empty(): " << numbers.empty() << '\n';
}

Output:

Initially, numbers.empty(): true
After adding elements, numbers.empty(): false

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