[petsc-dev] CHKERRXX() PetscErrorCxx, PetscTraceBackErrorHandlerCxx()

[Matthew Knepley]

Okay, that sounds right. I was always using CHKERRXX.

   Matt

On Tue, May 11, 2010 at 7:56 PM, Barry Smith <bsmith at mcs.anl.gov> wrote:

>
>
>   I've been trying to understand the use of CHKERRXX() PetscErrorCxx(),
> PetscTraceBackErrorHandlerCxx() and think it is messed up.
>
>   Assumptions
> 1) real PETSc c++ code (that is PETSc code that uses C++ constructs, has
> .cxx extensions) can call PETSc c code (the normal old PETSc source)
> 2) PETSc c code cannot call PETSc c++ code
> 3) PETSc c++ code uses C++ exceptions for error handling, NOT return
> values.
> are these correct?
>
>   Thus when PETSc c++ code calls PETSc c code it needs to translate any
> PETSc error return codes to C++ exceptions.  This is currently done by
> CHKERRXX() being a macro to PetscErrorCxx() that then calls
> PetscTraceBackErrorHandlerCxx() that actually generates the exception.  But
> PetscErrorCxx() is not really the same thing as calling PetscError and
> PetscTraceBackErrorHandlerCxx() is not really a C++ version of
> PetscTraceBackErrorHandler(). Plus PetscTraceBackErrorHandlerCxx() is not an
> error handler because it cannot be set with PetscPushErrorHandler().
>
>   I have started to reorganize this.
>
>  Turned PetscTraceBackErrorHandlerCxx() into a regular handler that can be
> pushed. Put the stream it uses into the handler context.
> Removed PetscErrorCxx()
> Added to PetscError() to automatically generate an exception if the caller
> is a C++ routine; as indicated by the PetscErrorType flag that is passed in.
> Changed CHKERRXX() to simply call PetscError() with the appropriate
> PetscErrorType of PETSC_ERROR_IN_CXX
> Not yet tested the PetscTraceBackErrorHandlerCxx()
>
>   Barry
>
>


-- 
What most experimenters take for granted before they begin their experiments
is infinitely more interesting than any results to which their experiments
lead.
-- Norbert Wiener
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