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From: Arkadiy Vertleyb (vertleyb_at_[hidden])
Date: 2007-06-14 11:46:24

"Douglas Gregor" <dgregor_at_[hidden]> wrote in message
> Arkadiy Vertleyb wrote:
>> Another example (from the Typeof library):
>> Types and templates are mapped to unique numbers using preprocessor
>> counter.
>> The resulting specializations depend on the order these specializations
>> are
>> seen by the preprocessor, and therefore on the order of inclusion.
> The Typeof library is a great thing, but the techniques needed to
> simulate what should be a language feature are C++ hacks. We don't need
> to loosen or fix the ODR, we need the functionality that the Typeof
> library provides ("give me the type of this expression!") to be in the
> language. decltype fixes that.

I did not suggest that C++ standard should be fixed to make the Typeof
library 100% compliant ;-)

My point was to mention the technique used; this technique (generating
template specializations on demand, and maybe using preprocessor counter to
give them unique numbers) might be useful in other contexts...

Or it might be not.


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