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