//  (C) Copyright David Abrahams 2000.

// 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)

//

//  The author gratefully acknowleges the support of Dragon Systems, Inc., in

//  producing this work.



#ifndef ERRORS_DWA052500_H_

# define ERRORS_DWA052500_H_



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

# include <boost/function/function0.hpp>



namespace boost { namespace python {



struct BOOST_PYTHON_DECL_EXCEPTION error_already_set

{

  virtual ~error_already_set();

};



// Handles exceptions caught just before returning to Python code.

// Returns true iff an exception was caught.

BOOST_PYTHON_DECL bool handle_exception_impl(function0<void>);



template <class T>

bool handle_exception(T f)

{

    return handle_exception_impl(function0<void>(boost::ref(f)));

}



namespace detail { inline void rethrow() { throw; } }



inline void handle_exception()

{

    handle_exception(detail::rethrow);

}



BOOST_PYTHON_DECL void throw_error_already_set();



template <class T>

inline T* expect_non_null(T* x)

{

    if (x == 0)

        throw_error_already_set();

    return x;

}



// Return source if it is an instance of pytype; throw an appropriate

// exception otherwise.

BOOST_PYTHON_DECL PyObject* pytype_check(PyTypeObject* pytype, PyObject* source);



}} // namespace boost::python



#endif // ERRORS_DWA052500_H_

