boost/python/errors.hpp

   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_