[PyQt] sip: extend exception support

[Phil Thompson]

On Mon, 27 Aug 2012 10:18:08 -0700, Matt Newell <newellm at blur.com> wrote:
>> 
>> In current hg...
>> 
>> %VirtualErrorCode is a new sub-directive of the %Module directive.
>> 
>> all_throw_cpp_exception replaced by all_use_VirtualErrorCode.
>> 
>> /ThrowsCppException/ replaced by /UsesVirtualErrorCode/.
>> 
>> /NoThrowsCppException/ replaced by /NoUsesVirtualErrorCode/.
>> 
>> Removed SIPPyException.
>> 
>> Phil
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> 
> I'm coming in a bit late to this discussion, but I have been maintaining
a 
> similar patch for a few years in order to solve the same problem.  
> 
> Below is the documentation that I wrote for my patch.
> 
> I don't know enough about the code you just added to compare the
> approaches, 
> but hopefully you can read through these docs(i can try to prepare an
> actual 
> patch too if you want) and verify that your changes will allow the same
> level 
> of functionality.  Specifically my code gives access to the c++ and
python 
> objects which allows the error to be handled without throwing a c++
> exception, 
> since in my case the calling c++ code does not expect an exception.

The difference is the access to the (not necessarily present) objects. How
are you getting these?

Phil