boost/python/converter/registrations.hpp

// Copyright David Abrahams 2002. Permission to copy, use,
// modify, sell and distribute this software is granted provided this
// copyright notice appears in all copies. This software is provided
// "as is" without express or implied warranty, and with no claim as
// to its suitability for any purpose.
#ifndef REGISTRATIONS_DWA2002223_HPP
# define REGISTRATIONS_DWA2002223_HPP

# include <boost/python/detail/prefix.hpp>

# include <boost/python/type_id.hpp>

# include <boost/python/converter/convertible_function.hpp>
# include <boost/python/converter/constructor_function.hpp>
# include <boost/python/converter/to_python_function_type.hpp>

# include <boost/detail/workaround.hpp>

namespace boost { namespace python { namespace converter { 

struct lvalue_from_python_chain
{
    convertible_function convert;
    lvalue_from_python_chain* next;
};

struct rvalue_from_python_chain
{
    convertible_function convertible;
    constructor_function construct;
    rvalue_from_python_chain* next;
};

struct BOOST_PYTHON_DECL registration
{
 public: // member functions
    explicit registration(type_info);
    
    // Convert the appropriately-typed data to Python
    PyObject* to_python(void const volatile*) const;

    // Return the class object, or raise an appropriate Python
    // exception if no class has been registered.
    PyTypeObject* get_class_object() const;

 public: // data members. So sue me.
    const python::type_info target_type;

    // The chain of eligible from_python converters when an lvalue is required
    lvalue_from_python_chain* lvalue_chain;

    // The chain of eligible from_python converters when an rvalue is acceptable
    rvalue_from_python_chain* rvalue_chain;
    
    // The class object associated with this type
    PyTypeObject* m_class_object;

    // The unique to_python converter for the associated C++ type.
    to_python_function_t m_to_python;
    
# if BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3003))
 private:
    void operator=(registration); // This is not defined, and just keeps MWCW happy.
# endif 
};

//
// implementations
//
inline registration::registration(type_info target_type)
    : target_type(target_type)
      , lvalue_chain(0)
      , rvalue_chain(0)
      , m_class_object(0)
      , m_to_python(0)
{}

inline bool operator<(registration const& lhs, registration const& rhs)
{
    return lhs.target_type < rhs.target_type;
}

}}} // namespace boost::python::converter

#endif // REGISTRATIONS_DWA2002223_HPP

Boost C++ Libraries

boost/python/converter/registrations.hpp