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C++ Iterator Library - istream_iterator
Description
It is a special input iterator that read successive elements from an input stream.
Declaration
Following is the declaration for std::istream_iterator.
C++11
template <class T, class charT = char, class traits = char_traits<charT>, class Distance = ptrdiff_t> class istream_iterator;
Parameters
T − It is an element type for the iterator.
charT − It is a first template parameter of the associated basic_istream object.
traits − It is a second template parameter of the associated basic_istream.
Distance − It is the difference between two iterators.
Return value
none
Exceptions
If x somehow throws while applying the unary operator& to it, this function never throws exceptions.
Time complexity
constant for random-access iterators.
Example
The following example shows the usage of std::insert_iterator.
#include <iostream> #include <iterator> int main () { double value1, value2; std::cout << "Please insert values: "; std::istream_iterator<double> eos; std::istream_iterator<double> iit (std::cin); if (iit!=eos) value1=*iit; ++iit; if (iit!=eos) value2=*iit; std::cout << value1 << "*" << value2 << "=" << (value1*value2) << '\n'; return 0; }
Let us compile and run the above program, this will produce the following result −
Please insert values: 0*6.95264e-310=0
iterator.htm
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