27 Iterators library [iterators]

27.5 Iterator adaptors [predef.iterators]

27.5.2 Insert iterators [insert.iterators]

27.5.2.2 back_­insert_­iterator operations [back.insert.iter.ops]

27.5.2.2.4 back_­insert_­iterator​::​operator++ [back.insert.iter.op++]

back_insert_iterator& operator++(); back_insert_iterator operator++(int);