reference operator*() const;
const value_type&, where value_type is the type of the elements extracted by the operator (the first class template parameter).1
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// istream_iterator example
#include <iostream> // std::cin, std::cout
#include <iterator> // std::istream_iterator
int main () {
double value1, value2;
std::cout << "Please, insert two values: ";
std::istream_iterator<double> eos; // end-of-stream iterator
std::istream_iterator<double> iit (std::cin); // stdin iterator
if (iit!=eos) value1=*iit;
++iit;
if (iit!=eos) value2=*iit;
std::cout << value1 << "*" << value2 << "=" << (value1*value2) << '\n';
return 0;
}