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/*
This example shows in a very simple way that the unserlying = operator is
used with copy(): the object's address itself is passed as the output
iterator of the copy() algorithm.
An interesting feature is that the return value is a pointer to an Ostream
object located nObjects farther than the initial Ostream object, thus
indicating the number of objects that were passed to the Ostream's
assignment operator.
Compared with the plain copy() example this one shows the use of the
istream_iterator<>() in combination with copy() and the simple Ostream
object into which the elements are copied
*/
#include <algorithm>
#include <iostream>
#include <string>
class Ostream
{
public:
Ostream &operator=(string const &item)
{
cerr << "assigning " << item << '\n';
}
};
int main()
{
Ostream
ostr;
Ostream
*op = copy(istream_iterator<string>(cin), istream_iterator<string>(),
&ostr);
cerr << (op == &ostr ? "same" : "different") << " object: " <<
(op - &ostr) << "\n";
}
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