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Notes

[1] Note the difference between assignment through a Container::iterator and assignment through an insert_iterator. If i is a valid Sequence::iterator, then it points to some particular element in the container; the expression *i = t replaces that element with t, and does not change the total number of elements in the container. If ii is a valid insert_iterator, however, then the expression *ii = t is equivalent, for some container c and some valid container::iterator j, to the expression c.insert(j, t). That is, it does not overwrite any of c's elements and it does change c's size.

[2] Note how assignment through an insert_iterator is implemented. In general, unary operator* must be defined so that it returns a proxy object, where the proxy object defines operator= to perform the insert operation. In this case, for the sake of simplicity, the proxy object is the insert_iterator itself. That is, *i simply returns i, and *i = t is equivalent to i = t. You should not, however, rely on this behavior. It is an implementation detail, and it is not guaranteed to remain the same in future versions.

[3] This function exists solely for the sake of convenience: since it is a non-member function, the template parameters may be inferred and the type of the insert_iterator need not be declared explicitly. One easy way to reverse a range and insert it into a Sequence S, for example, is reverse_copy(first, last, inserter(S, S.begin())).


New members | Standard Template Library Programmer`s Guide | See also







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