boost/python/stl_iterator.hpp

   1 // Copyright Eric Niebler 2005.
   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 #ifndef STL_ITERATOR_EAN20051028_HPP
   6 # define STL_ITERATOR_EAN20051028_HPP
   7
   8 # include <boost/python/detail/prefix.hpp>
   9
  10 # include <boost/python/object/stl_iterator_core.hpp>
  11
  12 # include <boost/iterator/iterator_facade.hpp>
  13
  14 namespace boost { namespace python
  15 {
  16
  17 // An STL input iterator over a python sequence
  18 template<typename ValueT>
  19 struct stl_input_iterator
  20   : boost::iterator_facade<
  21         stl_input_iterator<ValueT>
  22       , ValueT
  23       , std::input_iterator_tag
  24       , ValueT
  25     >
  26 {
  27     stl_input_iterator()
  28       : impl_()
  29     {
  30     }
  31
  32     // ob is the python sequence
  33     stl_input_iterator(boost::python::object const &ob)
  34       : impl_(ob)
  35     {
  36     }
  37
  38 private:
  39     friend class boost::iterator_core_access;
  40
  41     void increment()
  42     {
  43         this->impl_.increment();
  44     }
  45
  46     ValueT dereference() const
  47     {
  48         return extract<ValueT>(this->impl_.current().get())();
  49     }
  50
  51     bool equal(stl_input_iterator<ValueT> const &that) const
  52     {
  53         return this->impl_.equal(that.impl_);
  54     }
  55
  56     objects::stl_input_iterator_impl impl_;
  57 };
  58
  59 }} // namespace boost::python
  60
  61 #endif // STL_ITERATOR_EAN20051028_HPP