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Editing: map_indexing_suite.hpp

//  (C) Copyright Joel de Guzman 2003.
//  Distributed under the Boost Software License, Version 1.0. (See
//  accompanying file LICENSE_1_0.txt or copy at
//  http://www.boost.org/LICENSE_1_0.txt)

#ifndef MAP_INDEXING_SUITE_JDG20038_HPP
# define MAP_INDEXING_SUITE_JDG20038_HPP

# include <boost/python/suite/indexing/indexing_suite.hpp>
# include <boost/python/iterator.hpp>
# include <boost/python/call_method.hpp>
# include <boost/python/tuple.hpp>

namespace boost { namespace python {

// Forward declaration
    template <class Container, bool NoProxy, class DerivedPolicies>
    class map_indexing_suite;

namespace detail
    {
        template <class Container, bool NoProxy>
        class final_map_derived_policies
            : public map_indexing_suite<Container,
                NoProxy, final_map_derived_policies<Container, NoProxy> > {};
    }

// The map_indexing_suite class is a predefined indexing_suite derived
    // class for wrapping std::map (and std::map like) classes. It provides
    // all the policies required by the indexing_suite (see indexing_suite).
    // Example usage:
    //
    //  class X {...};
    //
    //  ...
    //
    //      class_<std::map<std::string, X> >("XMap")
    //          .def(map_indexing_suite<std::map<std::string, X> >())
    //      ;
    //
    // By default indexed elements are returned by proxy. This can be
    // disabled by supplying *true* in the NoProxy template parameter.
    //
    template <
        class Container,
        bool NoProxy = false,
        class DerivedPolicies
            = detail::final_map_derived_policies<Container, NoProxy> >
    class map_indexing_suite
        : public indexing_suite<
            Container
          , DerivedPolicies
          , NoProxy
          , true
          , typename Container::value_type::second_type
          , typename Container::key_type
          , typename Container::key_type
        >
    {
    public:

typedef typename Container::value_type value_type;
        typedef typename Container::value_type::second_type data_type;
        typedef typename Container::key_type key_type;
        typedef typename Container::key_type index_type;
        typedef typename Container::size_type size_type;
        typedef typename Container::difference_type difference_type;

template <class Class>
        static void
        extension_def(Class& cl)
        {
            //  Wrap the map's element (value_type)
            std::string elem_name = "map_indexing_suite_";
            object class_name(cl.attr("__name__"));
            extract<std::string> class_name_extractor(class_name);
            elem_name += class_name_extractor();
            elem_name += "_entry";

typedef typename mpl::if_<
                mpl::and_<is_class<data_type>, mpl::bool_<!NoProxy> >
              , return_internal_reference<>
              , default_call_policies
            >::type get_data_return_policy;

class_<value_type>(elem_name.c_str())
                .def("__repr__", &DerivedPolicies::print_elem)
                .def("data", &DerivedPolicies::get_data, get_data_return_policy())
                .def("key", &DerivedPolicies::get_key)
            ;
        }

static object
        print_elem(typename Container::value_type const& e)
        {
            return "(%s, %s)" % python::make_tuple(e.first, e.second);
        }

static
        typename mpl::if_<
            mpl::and_<is_class<data_type>, mpl::bool_<!NoProxy> >
          , data_type&
          , data_type
        >::type
        get_data(typename Container::value_type& e)
        {
            return e.second;
        }

static typename Container::key_type
        get_key(typename Container::value_type& e)
        {
            return e.first;
        }

static data_type&
        get_item(Container& container, index_type i_)
        {
            typename Container::iterator i = container.find(i_);
            if (i == container.end())
            {
                PyErr_SetString(PyExc_KeyError, "Invalid key");
                throw_error_already_set();
            }
            return i->second;
        }

static void
        set_item(Container& container, index_type i, data_type const& v)
        {
            container[i] = v;
        }

static void
        delete_item(Container& container, index_type i)
        {
            container.erase(i);
        }

static size_t
        size(Container& container)
        {
            return container.size();
        }

static bool
        contains(Container& container, key_type const& key)
        {
            return container.find(key) != container.end();
        }

static bool
        compare_index(Container& container, index_type a, index_type b)
        {
            return container.key_comp()(a, b);
        }

static index_type
        convert_index(Container& /*container*/, PyObject* i_)
        {
            extract<key_type const&> i(i_);
            if (i.check())
            {
                return i();
            }
            else
            {
                extract<key_type> i(i_);
                if (i.check())
                    return i();
            }

PyErr_SetString(PyExc_TypeError, "Invalid index type");
            throw_error_already_set();
            return index_type();
        }
    };

}} // namespace boost::python

#endif // MAP_INDEXING_SUITE_JDG20038_HPP

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