text: //
  // Copyright 2016 Pixar
  //
  // Licensed under the Apache License, Version 2.0 (the "Apache License")
  // with the following modification; you may not use this file except in
  // compliance with the Apache License and the following modification to it:
  // Section 6. Trademarks. is deleted and replaced with:
  //
  // 6. Trademarks. This License does not grant permission to use the trade
  //    names, trademarks, service marks, or product names of the Licensor
  //    and its affiliates, except as required to comply with Section 4(c) of
  //    the License and to reproduce the content of the NOTICE file.
  //
  // You may obtain a copy of the Apache License at
  //
  //     http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the Apache License with the above modification is
  // distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  // KIND, either express or implied. See the Apache License for the specific
  // language governing permissions and limitations under the Apache License.
  //
  #ifndef TF_WRAP_TYPE_HELPERS_H
  #define TF_WRAP_TYPE_HELPERS_H
  
  #include "pxr/pxr.h"
  
  #include "pxr/base/tf/api.h"
  #include "pxr/base/tf/pyObjWrapper.h"
  #include "pxr/base/tf/type.h"
  #include <boost/python/class.hpp>
  #include <boost/python/def_visitor.hpp>
  
  PXR_NAMESPACE_OPEN_SCOPE
  
  // Private implementation namespace; public types are exposed below.
  namespace TfType_WrapHelpers {
  
      using namespace boost::python;
  
      struct _PythonClass : def_visitor<_PythonClass>
      {
          friend class def_visitor_access;
              
      private:
          template <class CLS, class T>
          void _Visit(CLS &c, T *) const {
              if (TfType t = TfType::Find<T>())
                  t.DefinePythonClass(c);
          }
  
      public:
          template <class CLS>
          void visit(CLS &c) const {
              // Use function template resolution to wrap the type
              // appropriately depending on whether it is a polymorphic
              // wrapper<> type.
              typedef typename CLS::wrapped_type Type;
              _Visit(c, detail::unwrap_wrapper((Type*)0));
          }
      };
  
  } // namespace TfType_WrapHelpers
  
  
  /// \struct TfTypePythonClass
  /// A boost.python visitor that associates the Python class object created by
  /// the wrapping with the TfType of the C++ type being wrapped.
  ///
  /// Example use:
  /// \code
  /// class_<Foo, ...>("Foo", ...)
  ///     .def( TfTypePythonClass() )
  /// \endcode
  ///
  struct TfTypePythonClass : public TfType_WrapHelpers::_PythonClass {};
  
  /// A helper for wrapping C++ types.
  /// This method defines a TfType for the given python class object, and also
  /// recursively defines TfTypes for all the Python bases if necessary.
  TF_API TfType TfType_DefinePythonTypeAndBases( const boost::python::object & classObj );
  
  PXR_NAMESPACE_CLOSE_SCOPE
  
  #endif // TF_WRAP_TYPE_HELPERS_H
  