26 Containers library [containers]

26.3 Sequence containers [sequences]

26.3.9 Class template forward_­list [forwardlist] forward_­list iterators [forwardlist.iter]

iterator before_begin() noexcept; const_iterator before_begin() const noexcept; const_iterator cbefore_begin() const noexcept;
Returns: A non-dereferenceable iterator that, when incremented, is equal to the iterator returned by begin().
Effects: cbefore_­begin() is equivalent to const_­cast<forward_­list const&>(*this).before_­begin().
Remarks: before_­begin() == end() shall equal false.