The class Istream_iterator<T,Stream> is an input iterator adaptor for the input stream class Stream and value type . It is particularly useful for classes that are similar but not compatible to std::istream.
#include <CGAL/IO/Istream_iterator.h>
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creates an end-of-stream
iterator i. This is a past-the-end iterator, and it is useful
when constructing a range.
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creates an input
iterator i reading from . When reaches end of stream,
this iterator will compare equal to an end-of-stream iterator
created using the default constructor.
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i fulfills the requirements for an input iterator.
The following program reads points from a Window_stream until the right mouse button gets clicked.
#ifndef CGAL_USE_LEDA #include <iostream> int main(){ std::cout << "This demo needs LEDA" << std::endl; return 0;} #else #include <CGAL/Cartesian.h> #include <CGAL/IO/Istream_iterator.h> #include <CGAL/IO/Window_stream.h> #include <iostream> #include <algorithm> typedef CGAL::Cartesian<double>::Point_2 Point; typedef CGAL::Istream_iterator<Point, CGAL::Window_stream> Iterator; #ifdef CGAL_USE_CGAL_WINDOW #define leda_window CGAL::window #define leda_green CGAL::green #endif void init_window( leda_window& W) { CGAL::cgalize( W); W.set_fg_color( leda_green); W.display(); W.init(-1.0, 1.0, -1.0); } int main () { CGAL::Window_stream window( 512, 512); init_window(window); std::copy( Iterator(window), Iterator(), std::ostream_iterator<Point>(std::cout,"\n")); return 0; } #endif