[patch-rfc] N2179: Exception Propagation in C++

[Sebastian Redl]

Peter Dimov wrote:
> 4)
>
> Define __exception_ptr. Add
>
> #ifdef __GXX_EXPERIMENTAL_CXX0X__
> typedef __exception_ptr exception_ptr;
> #endif
>
> ?

I went with a variant of this. I define everything (including the free 
functions) in the namespace __exception_ptr and import it into std if 0x 
mode is enabled.

Modified patch attached.

Sebastian
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