std::forward_list<T,Allocator>::empty
From cppreference.com
bool empty() const noexcept; |
(since C++11) | |
Checks if the container has no elements, i.e. whether begin() == end().
Return value
true if the container is empty, false otherwise.
Complexity
Constant.
Example
The following code uses empty to check if a std::forward_list<int> contains any elements:
Run this code
#include <forward_list>
#include <iostream>
int main()
{
std::forward_list<int> numbers;
std::cout << std::boolalpha;
std::cout << "Initially, numbers.empty(): " << numbers.empty() << '\n';
numbers.push_front(42);
numbers.push_front(13317);
std::cout << "After adding elements, numbers.empty(): " << numbers.empty() << '\n';
}
Output:
Initially, numbers.empty(): true
After adding elements, numbers.empty(): false
See also
| returns the distance between two iterators (function template) |