std::forward_list::before_begin, cbefore_begin

iterator before_begin();
(since C++11)
const_iterator before_begin() const;
(since C++11)
const_iterator cbefore_begin() const;
(since C++11)

Returns an iterator to the element before the first element of the container. This element acts as a placeholder, attempting to access it results in undefined behavior. The only usage cases are in functions insert_after(), emplace_after(), erase_after(), splice_after() and the increment operator: incrementing the before-begin iterator gives exactly the same iterator as obtained from begin()/cbegin().


[edit] Parameters


[edit] Return value

Iterator to the element before the first element.

[edit] Exceptions

noexcept specification:  

[edit] Complexity


[edit] See also

returns an iterator to the beginning
(public member function)
returns an iterator to the end
(public member function)