Re: [boost] numeric_limits<Abstract> or how to fix 1358600?

From: John Maddock (john_at_[hidden])
Date: 2007-01-21 10:55:58

Dmitry Ivankov wrote:
> Good idea.
> What about a backdoor for those compilers?
> Something like let users specialize
> i_really_have_specialized_numeric_limits<T>::value
> for their non-abstract polymorphic types.

I don't think that it's necessary to be that complicated:

1) If the type *is* really abstract, then numeric_limits support probably 
doesn't make sense since the type is not a "value" type.  So filtering out 
abstract types probably makes sense whatever.

2) If a type is *not* abstract and the compiler supports numeric_limits then 
we're OK anyway I think?

3) If the compiler is broken and doesn't support is_abstract, then users can 
always specialise is_abstract for a non-abstract polymorphic type if they 
want the numeric limits code to kick in.

John.