1 //  (C) Copyright David Abrahams 2000.

     2 // Distributed under the Boost Software License, Version 1.0. (See

     3 // accompanying file LICENSE_1_0.txt or copy at

     4 // http://www.boost.org/LICENSE_1_0.txt)

     5 //

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

     7 //  producing this work.

     8 

     9 #ifndef ERRORS_DWA052500_H_

    10 # define ERRORS_DWA052500_H_

    11 

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

    13 # include <boost/function/function0.hpp>

    14 

    15 namespace boost { namespace python {

    16 

    17 struct BOOST_PYTHON_DECL_EXCEPTION error_already_set

    18 {

    19   virtual ~error_already_set();

    20 };

    21 

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

    23 // Returns true iff an exception was caught.

    24 BOOST_PYTHON_DECL bool handle_exception_impl(function0<void>);

    25 

    26 template <class T>

    27 bool handle_exception(T f)

    28 {

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

    30 }

    31 

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

    33 

    34 inline void handle_exception()

    35 {

    36     handle_exception(detail::rethrow);

    37 }

    38 

    39 BOOST_PYTHON_DECL void throw_error_already_set();

    40 

    41 template <class T>

    42 inline T* expect_non_null(T* x)

    43 {

    44     if (x == 0)

    45         throw_error_already_set();

    46     return x;

    47 }

    48 

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

    50 // exception otherwise.

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

    52 

    53 }} // namespace boost::python

    54 

    55 #endif // ERRORS_DWA052500_H_