iterator adaptors - insert iterators
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Three different insert iterators
The trick Operations:
Implementations of insert iterators usually use the following two-step trick:
1) Operator * is implemented as a no-op that simply returns *this. Thus, for insert iterators, *pos is equivalent to pos.
2) The assignment operator is implemented so that it gets transferred into an insertion. In fact, the insert iterator calls the push_back(), push_front(), or insert() member function of the container.
Since each inserter uses a different member function, which it calls for the container to which it belongs, an insert iterator must be always initialized with its container.
vector<int> coll;
back_insert_iterator<decltype(coll)> iter(coll);
*iter = 1; // insert
*iter = 2; // insert
set<int> coll2;
insert_iterator<decltype(coll1)> iter2(coll2, coll2.begin());
*iter = 1;
*iter = 2;
*iter = 3;
inserter(coll2,coll2.end()) = 44;
list<int> coll3;
copy (coll2.begin(), col2l.end(), // source
inserter(coll3,coll3.begin())); // destination
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