On Aug 9, 2011, at 9:14 PM, John McCall wrote:

> On Aug 9, 2011, at 5:34 PM, Howard Hinnant wrote:
>> On Aug 9, 2011, at 8:24 PM, John McCall wrote:
>>> Apple's current ABI does not implement std::exception_ptr, nor does it try 
>>> to support any of the "dependent" exception stuff.
>> 
>> This test, taken from 
>> libc++/test/language.support/support.exception/propagation/rethrow_exception.cpp:
>> passes for me on Lion using clang++ -std=c++0x -stdlib=libc++.  I 
>> implemented the "dependent" exception stuff quite awhile ago (you're welcome 
>> ;-)).
> 
> Oh, I think I was looking at the wrong code.  I stand corrected.
> 
>>> As far as I understand it, Sebastian introduced dependent (i.e. wrapped) 
>>> exceptions in order to support capturing and rethrowing an arbitrary, 
>>> potentially foreign exception via std::exception_ptr.
>> 
>> In gcc, yes.  And it is that design, described at a high level in 
>> cxx-abi-dev, that I followed (the high level description in cxx-abi-dev, not 
>> the code in gcc).
> 
> I went and read through the cxx-abi-dev discussion, and I see the necessity 
> of dependent exceptions now even for non-foreign exceptions.  I would 
> appreciate it if we changed the name in our implementation to "envelope 
> exception" or something like that;  overloading "dependent" is quite 
> unfortunate.

That seems reasonable.

Howard

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