[#D4F1A89C2F1C6BF35BE824A4EB14329EA5805F04]
Assignment
segments_ref& operator=(segments_ref const& other);
The existing contents are replaced by a copy of the other segments.
All iterators are invalidated.
None of the character buffers referenced by `other` may overlap the buffer of the underlying url, or else the behavior is undefined.
this->assign( other.begin(), other.end() );
Linear in `other.buffer().size()`.
Strong guarantee. Calls to allocate may throw.
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