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Showing content from https://timsong-cpp.github.io/cppwp/n4140/forwardlist.iter below:

[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.

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