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Showing content from https://timsong-cpp.github.io/cppwp/n4659/forwardlist.iter below:

[forwardlist.iter]

26 Containers library [containers] 26.3 Sequence containers [sequences] 26.3.9 Class template forward_­list [forwardlist] 26.3.9.3 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.


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