Re: [boost] Re: is_convertible: bug or missing feature?

From: Thomas Witt (witt_at_[hidden])
Date: 2002-05-10 04:08:38

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On Friday 10 May 2002 10:55, Gennadiy Rozental wrote:
>
> MSVC responce:
> error C2664: '__thiscall B::B(const struct B &)' : cannot convert parameter
> 1 from 'const struct A<struct C>' to 'const struct B &'
>         Reason: cannot convert from 'const struct A<struct C>' to 'const
> struct B'
>         No constructor could take the source type, or constructor overload
> resolution was ambiguous
> see reference to function template instantiation '__thiscall A<struct
> B>::A<struct B>(const struct A<struct C> &)' being compiled
>

Ok after looking at the implementation(Yes I should have done this inthe first 
place) here is my next shot.

IIUC the problem is that there is an conversion "template <class T> A(A<T> 
const&);" and thats what is_convertible can detect.

It does _not_ detect whether it is actually usable, as it does not instantiate 
it.

Thomas
- -- 
Dipl.-Ing. Thomas Witt
Institut fuer Verkehrswesen, Eisenbahnbau und -betrieb, Universitaet Hannover
voice: [phone] - 4273, fax: [phone]
http://www.ive.uni-hannover.de
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