NAME

std::forward_list::before_begin,cbefore_begin - std::forward_list::before_begin,cbefore_begin

Synopsis

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

Parameters

(none)

Return value

Iterator to the element before the first element.

Complexity

Constant.

See also

begin returns an iterator to the beginning
cbegin (public member function)
(C++11)
end returns an iterator to the end
cend (public member function)
(C++11)