[cxx-abi-dev] A mangling for std::nullptr_t

[David Vandevoorde]

Attached are diffs for a revised proposal: There is no longer a separate type_info variant for nullptr_t.  I did make it more explicit that fundamental types have __fundamental_type_info entries.

	Daveed

 
On Mar 4, 2010, at 3:45 AM, Dennis Handly wrote:

>> From: Jason Merrill <jason at redhat.com>
>> None of the RTTI types match the mangled names of types that use them.
> 
> Sorry.  I meant it matches except for the _ZTI prefix:
> _ZTIl == type info of long
> 
>>> Why not follow the same path?
>>>    if (catch_type == typeid(std::nullptr_t))
> 
>> I suppose this would also work, and would indeed save us a few words of 
>> space in the runtime library.
> Jason
> 
> It also saves typing in that new class in the header file.  :-)
> But it saves a vtable and type_info for that class.
> 
> We have a demamgler library using lots of virtual functions and it has
> over 19 Kb of C++ metadata.  Where adding a simple tag (with lots of switches)
> would save lots of data space.
> 
> With the typeid(std::nullptr_t) new case, you probably only need to check
> in a few places.