[boost] Re: [Boost-users] B is_convertible to A<T> for some T

From: Aleksey Gurtovoy (agurtovoy_at_[hidden])
Date: 2005-01-07 06:59:50

John Maddock writes:
>> how do I express through template metaprogramming or in a similar
>> way that a class is convertible to a template class for some T1?
>> I.e., the condition: "There exists some T1 such that B is
>> convertible to A<T1>".  An example program: (Platform: VC++7.1)
>
> I guess you want the type-trait: is_convertible<from, to>.

In his case, 'to' is an unbound family of types ('A<X>' for any 'X'),
so 'is_convertible' won't do it. May be we should consider getting
this in the library, in some form. E.g. tweak 'is_convertible' to
support something like

    is_convertible<from, A<_> >

-- 
Aleksey Gurtovoy
MetaCommunications Engineering