include/cppuhelper/exc_hlp.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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   5  * This Source Code Form is subject to the terms of the Mozilla Public
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   9  * This file incorporates work covered by the following license notice:
  10  *
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  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 _CPPUHELPER_EXC_HLP_HXX_
  21 #define _CPPUHELPER_EXC_HLP_HXX_
  22
  23 #include <com/sun/star/uno/Any.hxx>
  24 #include "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 dervived 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 ::com::sun::star::uno::Any & rExc )
  37     SAL_THROW( (::com::sun::star::uno::Exception) );
  38
  39 /** Use this function to get the dynamic type of a caught C++-UNO exception;
  40     completes the above function throwing exceptions generically.
  41
  42     @code
  43     try
  44     {
  45         ...
  46     }
  47     catch (::com::sun::star::uno::RuntimeException &)
  48     {
  49         // you ought not handle RuntimeExceptions:
  50         throw;
  51     }
  52     catch (::com::sun::star::uno::Exception &)
  53     {
  54         ::com::sun::star::uno::Any caught( ::cppu::getCaughtException() );
  55         ...
  56     }
  57     @endcode
  58
  59     Restrictions:
  60     - use only for caught C++-UNO exceptions (UNOIDL defined)
  61     - only as first statement in a catch block!
  62     - don't do a C++ rethrow (throw;) after you have called this function
  63     - call getCaughtException() just once in your catch block!
  64       (function internally uses a C++ rethrow)
  65
  66     @return
  67               caught UNO exception
  68
  69     @attention Caution!
  70               This function is limited to the same C++ compiler runtime library.
  71               E.g. for MSVC, this means that the catch handler code (the one
  72               that calls getCaughtException()) needs to use the very same
  73               C++ runtime library, e.g. msvcrt.dll as cppuhelper, e.g.
  74               cppuhelper3MSC.dll and the bridge library, e.g. msci_uno.dll.
  75               This is the case if all of them are compiled with the same
  76               compiler version.
  77               Background: The msci_uno.dll gets a rethrown exception out
  78               of the internal msvcrt.dll thread local storage (tls).
  79               Thus you _must_ not use this function if your code needs to run
  80               in newer UDK versions without being recompiled, because those
  81               newer UDK (-> OOo versions) potentially use newer C++ runtime
  82               libraries which most often become incompatible!
  83
  84               But this function ought to be usable for most OOo internal C++-UNO
  85               development, because the whole OOo code base is compiled using the
  86               same C++ compiler (and linking against one runtime library).
  87 */
  88 CPPUHELPER_DLLPUBLIC ::com::sun::star::uno::Any SAL_CALL getCaughtException();
  89
  90 }
  91
  92 #endif
  93
  94 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */