Program Listing for File std-map.hpp

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#ifndef __eigenpy_utils_map_hpp__
#define __eigenpy_utils_map_hpp__

#include <boost/python/suite/indexing/map_indexing_suite.hpp>

namespace eigenpy {
namespace details {
template <typename Container>
struct overload_base_get_item_for_std_map
    : public boost::python::def_visitor<
          overload_base_get_item_for_std_map<Container> > {
  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;

  template <class Class>
  void visit(Class& cl) const {
    cl.def("__getitem__", &base_get_item);
  }

 private:
  static boost::python::object base_get_item(
      boost::python::back_reference<Container&> container, PyObject* i_) {
    index_type idx = convert_index(container.get(), i_);
    typename Container::iterator i = container.get().find(idx);
    if (i == container.get().end()) {
      PyErr_SetString(PyExc_KeyError, "Invalid key");
      bp::throw_error_already_set();
    }

    typename bp::to_python_indirect<data_type&,
                                    bp::detail::make_reference_holder>
        convert;
    return bp::object(bp::handle<>(convert(i->second)));
  }

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

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

}  // namespace details
}  // namespace eigenpy

#endif  // ifndef __eigenpy_utils_map_hpp__