std::forward_list<T,Allocator>::empty (3) - Linux Manuals
std::forward_list<T,Allocator>::empty: std::forward_list<T,Allocator>::empty
Command to display std::forward_list<T,Allocator>::empty
manual in Linux: $ man 3 std::forward_list<T,Allocator>::empty
NAME
std::forward_list<T,Allocator>::empty - std::forward_list<T,Allocator>::empty
Synopsis
bool empty() const noexcept; (since C++11)
(until C++20)
[[nodiscard]] bool empty() const noexcept; (since C++20)
Checks if the container has no elements, i.e. whether begin() == end().
Parameters
(none)
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 << "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(): 1
After adding elements, numbers.empty(): 0
Pages related to std::forward_list<T,Allocator>::empty
- std::forward_list<T,Allocator>::emplace_after (3) - std::forward_list<T,Allocator>::emplace_after
- std::forward_list<T,Allocator>::emplace_front (3) - std::forward_list<T,Allocator>::emplace_front
- std::forward_list<T,Allocator>::end,std::forward_list<T,Allocator>::cend (3) - std::forward_list<T,Allocator>::end,std::forward_list<T,Allocator>::cend
- std::forward_list<T,Allocator>::erase_after (3) - std::forward_list<T,Allocator>::erase_after
- std::forward_list<T,Allocator>::assign (3) - std::forward_list<T,Allocator>::assign
- std::forward_list<T,Allocator>::before_begin,cbefore_begin (3) - std::forward_list<T,Allocator>::before_begin,cbefore_begin
- std::forward_list<T,Allocator>::begin,std::forward_list<T,Allocator>::cbegin (3) - std::forward_list<T,Allocator>::begin,std::forward_list<T,Allocator>::cbegin
- std::forward_list<T,Allocator>::clear (3) - std::forward_list<T,Allocator>::clear
- std::forward_list<T,Allocator>::forward_list (3) - std::forward_list<T,Allocator>::forward_list
- std::forward_list<T,Allocator>::front (3) - std::forward_list<T,Allocator>::front
- std::forward_list<T,Allocator>::get_allocator (3) - std::forward_list<T,Allocator>::get_allocator
- std::forward_list<T,Allocator>::insert_after (3) - std::forward_list<T,Allocator>::insert_after
- std::forward_list<T,Allocator>::max_size (3) - std::forward_list<T,Allocator>::max_size
- std::forward_list<T,Allocator>::merge (3) - std::forward_list<T,Allocator>::merge
- std::forward_list<T,Allocator>::operator= (3) - std::forward_list<T,Allocator>::operator=
- std::forward_list<T,Allocator>::pop_front (3) - std::forward_list<T,Allocator>::pop_front
- std::forward_list<T,Allocator>::push_front (3) - std::forward_list<T,Allocator>::push_front
- std::forward_list<T,Allocator>::remove,remove_if (3) - std::forward_list<T,Allocator>::remove,remove_if
- std::forward_list<T,Allocator>::resize (3) - std::forward_list<T,Allocator>::resize
- std::forward_list<T,Allocator>::reverse (3) - std::forward_list<T,Allocator>::reverse
- std::forward_list<T,Allocator>::sort (3) - std::forward_list<T,Allocator>::sort
- std::forward_list<T,Allocator>::splice_after (3) - std::forward_list<T,Allocator>::splice_after
- std::forward_list<T,Allocator>::swap (3) - std::forward_list<T,Allocator>::swap
- std::forward_list<T,Allocator>::unique (3) - std::forward_list<T,Allocator>::unique
- std::forward_list<T,Allocator>::~forward_list (3) - std::forward_list<T,Allocator>::~forward_list
- std::forward_list (3) - std::forward_list