include/cppuhelper/exc_hlp.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #ifndef INCLUDED_CPPUHELPER_EXC_HLP_HXX
  21 #define INCLUDED_CPPUHELPER_EXC_HLP_HXX
  22
  23 #include "com/sun/star/uno/Any.hxx"
  24 #include "cppuhelper/cppuhelperdllapi.h"
  25
  26 namespace cppu
  27 {
  28
  29 /** This function throws the exception given by rExc.  The given value has to
  30     be of typeclass EXCEPTION and must be derived from or of
  31     type com.sun.star.uno.Exception.
  32
  33     @param rExc
  34            exception to be thrown.
  35 */
  36 CPPUHELPER_DLLPUBLIC void SAL_CALL throwException( const css::uno::Any & rExc );
  37
  38 /** Use this function to get the dynamic type of a caught C++-UNO exception;
  39     completes the above function throwing exceptions generically.
  40
  41     @code
  42     try
  43     {
  44         ...
  45     }
  46     catch (css::uno::RuntimeException &)
  47     {
  48         // you ought not handle RuntimeExceptions:
  49         throw;
  50     }
  51     catch (css::uno::Exception &)
  52     {
  53         css::uno::Any caught( ::cppu::getCaughtException() );
  54         ...
  55     }
  56     @endcode
  57
  58     Restrictions:
  59     - use only for caught C++-UNO exceptions (UNOIDL defined)
  60     - only as first statement in a catch block!
  61     - don't do a C++ rethrow (throw;) after you have called this function
  62     - call getCaughtException() just once in your catch block!
  63       (function internally uses a C++ rethrow)
  64
  65     @return
  66               caught UNO exception
  67
  68     @attention Caution!
  69               This function is limited to the same C++ compiler runtime library.
  70               E.g. for MSVC, this means that the catch handler code (the one
  71               that calls getCaughtException()) needs to use the very same
  72               C++ runtime library, e.g. msvcrt.dll as cppuhelper, e.g.
  73               cppuhelper3MSC.dll and the bridge library, e.g. msci_uno.dll.
  74               This is the case if all of them are compiled with the same
  75               compiler version.
  76               Background: The msci_uno.dll gets a rethrown exception out
  77               of the internal msvcrt.dll thread local storage (tls).
  78               Thus you _must_ not use this function if your code needs to run
  79               in newer UDK versions without being recompiled, because those
  80               newer UDK (-> OOo versions) potentially use newer C++ runtime
  81               libraries which most often become incompatible!
  82
  83               But this function ought to be usable for most OOo internal C++-UNO
  84               development, because the whole OOo code base is compiled using the
  85               same C++ compiler (and linking against one runtime library).
  86 */
  87 CPPUHELPER_DLLPUBLIC css::uno::Any SAL_CALL getCaughtException();
  88
  89 }
  90
  91 #endif
  92
  93 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */