##### cppreference.com

##### Search

Create account

##### Namespaces

- Page
- Discussion

##### Variants

##### Views

- View
- Edit
- History

##### Actions

# std::forward_list::before_begin, cbefore_begin

From cppreference.com
< cpp‎ | container‎ | forward list

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

(none)

### [edit] Return value

Iterator to the element before the first element.

### [edit] Exceptions

`noexcept` specification:
noexcept

### [edit] Complexity

Constant.

### [edit] See also

begin cbegin | returns an iterator to the beginning (public member function) [edit]
end cend | returns an iterator to the end (public member function) [edit]

Retrieved from "http://en.cppreference.com/mwiki/index.php?title=cpp/container/forward_list/before_begin&oldid=91371"
Category:

- unconditionally noexcept

Hidden categories:

- Pages with unreviewed unconditional noexcept template
- Pages with unreviewed noexcept template