input iterator support

[SVN r13960]

test/input_iterator.cpp

@@ -0,0 +1,50 @@
+// Copyright David Abrahams 2002. Permission to copy, use,
+// modify, sell and distribute this software is granted provided this
+// copyright notice appears in all copies. This software is provided
+// "as is" without express or implied warranty, and with no claim as
+// to its suitability for any purpose.
+#include <boost/python/module.hpp>
+#include <boost/python/class.hpp>
+#include <boost/python/iterator.hpp>
+#include <boost/iterator_adaptors.hpp>
+#include <list>
+#include <utility>
+#include <iterator>
+#include <functional>
+
+using namespace boost::python;
+
+typedef std::list<int> list_int;
+
+// Prove that we can handle InputIterators which return rvalues.  This
+// input iterator example was stolen from the iterator_adaptors
+// documentation
+typedef std::binder1st<std::multiplies<int> > doubler;
+typedef boost::transform_iterator_generator<doubler, list_int::iterator>::type doubling_iterator;
+typedef std::pair<doubling_iterator,doubling_iterator> list_range2;
+list_range2 range2(list_int& x)
+{
+    return list_range2(
+        boost::make_transform_iterator<doubler>(x.begin(), std::bind1st(std::multiplies<int>(),2))
+      , boost::make_transform_iterator<doubler>(x.end(), std::bind1st(std::multiplies<int>(),2)));
+}
+
+// We do this in a separate module from iterators_ext (iterators.cpp)
+// to work around an MSVC6 linker bug, which causes it to complain
+// about a "duplicate comdat" if the input iterator is instantiated in
+// the same module with the others.
+BOOST_PYTHON_MODULE_INIT(input_iterator)
+{
+    module("input_iterator")
+        .def("range2", &::range2)
+        .add(
+            class_<list_range2>("list_range2")
+
+            // We can wrap InputIterators which return by-value
+            .def("__iter__"
+                 , range(&list_range2::first, &list_range2::second))
+            )
+        ;
+}
+
+#include "module_tail.cpp"