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Дата индексирования: Mon Oct 1 21:22:45 2012
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Exceptions

Due to the limited support for exceptions in earlier versions of the GNU C++ compiler (namely gcc 2.7.2) MICO supports several kinds of exception handling:

• CORBA compliant exception handling
• MICO specific exception handling
• no exception handling

Two common problems with exception handling are ``catching by base classes'' and ``exceptions in shared libraries'':

• catching by base classes: when throwing exception X it should be possible to catch it by specifying a base class of X in the catch clause. Some compilers (noteably gcc 2.7) do not support this.
• exceptions in shared libraries: throwing an exception from a shared library into non shared library code does not work with some compilers on some platforms (gcc 2.7, gcc 2.8 and egcs 1.x on some platforms).

Which kind of exception handling is used is determined by the capabilities of the C++ compiler and command line options passed to the configure script. By default CORBA compliant exception handling will be selected if the C++ compiler supports catching by base classes, otherwise MICO specific exception handling is selected if the compiler supports exception handling at all. If exceptions in shared libraries do not work then no exception handling is selected for code in shared libraries. You can enforce MICO specific exception handling by specifying -disable-std-eh as a command line option to configure. You can disable exception handling by specifying -disable-except as a command line option to configure.

You can find out about the exception handling support of your MICO binaries by running the IDL-Compiler with the -config command line option:

  $ idl --config
  MICO version: 2.2.7
  supported CORBA version: 2.3
  exceptions: CORBA compliant
  modules are mapped to: namespaces
  STL is: miniSTL
  SSL support: no
  loadable modules: yes

The following sections go into detail about each of the exception handling modes supported by MICO.

 
• CORBA Compliant Exception Handling
• MICO Specific Exception Handling
• No Exception handling