23 Containers library [containers]

23.3 Sequence containers [sequences]

23.3.7 Class template forward_list [forward.list]

23.3.7.3 Iterators [forward.list.iter]

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