ceph/src/boost/libs/python/test/input_iterator.cpp

   1 // Copyright David Abrahams 2002.
   2 // Distributed under the Boost Software License, Version 1.0. (See
   3 // accompanying file LICENSE_1_0.txt or copy at
   4 // http://www.boost.org/LICENSE_1_0.txt)
   5 #include <boost/python/module.hpp>
   6 #include <boost/python/def.hpp>
   7 #include <boost/python/class.hpp>
   8 #include <boost/python/iterator.hpp>
   9 #include <boost/iterator/transform_iterator.hpp>
  10 #include <list>
  11
  12 using namespace boost::python;
  13
  14 typedef std::list<int> list_int;
  15
  16 // Prove that we can handle InputIterators which return rvalues.
  17 struct doubler
  18 {
  19     typedef int result_type;
  20     int operator()(int x) const { return x * 2; }
  21 };
  22
  23 typedef boost::transform_iterator<doubler, list_int::iterator> doubling_iterator;
  24 typedef std::pair<doubling_iterator,doubling_iterator> list_range2;
  25
  26 list_range2 range2(list_int& x)
  27 {
  28     return list_range2(
  29         boost::make_transform_iterator<doubler>(x.begin(), doubler())
  30       , boost::make_transform_iterator<doubler>(x.end(), doubler()));
  31 }
  32
  33 // We do this in a separate module from iterators_ext (iterators.cpp)
  34 // to work around an MSVC6 linker bug, which causes it to complain
  35 // about a "duplicate comdat" if the input iterator is instantiated in
  36 // the same module with the others.
  37 BOOST_PYTHON_MODULE(input_iterator)
  38 {
  39     def("range2", &::range2);
  40
  41     class_<list_range2>("list_range2")
  42         // We can wrap InputIterators which return by-value
  43         .def("__iter__"
  44              , range(&list_range2::first, &list_range2::second))
  45         ;
  46 }
  47
  48 #include "module_tail.cpp"