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std::forward_list::before_begin, cbefore_begin

From cppreference.com
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().

Contents

[edit] Parameters

(none)

[edit] Return value

Iterator to the element before the first element.

[edit] Complexity

Constant.

[edit] See also

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