[forward.list.iter]

# 23 Containers library [[containers]](./#containers)

## 23.3 Sequence containers [[sequences]](sequences#forward.list.iter)

### 23.3.7 Class template forward_list [[forward.list]](forward.list#iter)

#### 23.3.7.3 Iterators [forward.list.iter]

[🔗](#lib:before_begin,forward_list)

`constexpr iterator before_begin() noexcept;
constexpr const_iterator before_begin() const noexcept;
constexpr const_iterator cbefore_begin() const noexcept;
`

[1](#1)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L7238)

*Effects*: cbefore_begin() is equivalent toconst_cast<forward_list const&>(*this).before_begin()[.](#1.sentence-1)

[2](#2)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L7243)

*Returns*: A non-dereferenceable iterator that, when incremented, is equal to the iterator
returned by begin()[.](#2.sentence-1)

[3](#3)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L7248)

*Remarks*: before_begin() == end() shall equal false[.](#3.sentence-1)