Re: [boost] [chrono] [dependence of common_type on Boost.TypeOf]

Subject: Re: [boost] [chrono] [dependence of common_type on Boost.TypeOf]
From: Stewart, Robert (Robert.Stewart_at_[hidden])
Date: 2010-08-16 07:22:06

vicente.botet wrote:
> Adam Merz wrote:
>
> > Or, if you make the aforementioned pointer changes, you get
> > the even more confusing:
> >
> > 1>error C2446: ':' : no conversion from 'Baz *' to 'Foo *'
> > 1>  Types pointed to are unrelated; conversion requires
> reinterpret_cast,
> > 1>      C-style cast or function-style cast
> > 1>  see reference to class template instantiation
> 'common_type2<T1,T2>' being
> > 1>      compiled
> > 1>  with
> > 1>  [
> > 1>    T1=Foo,
> > 1>    T2=Baz
> > 1>  ]
> > 1>error C2070: ''unknown-type'': illegal sizeof operand
>
> I find the  message no so confusing:  "Types pointed to are
> unrelated; conversion requires reinterpret_cast,  C-style
> cast or function-style cast" and common_type2<T1,T2> appears
> also in the message.

One issue is that the user may have written nothing in terms of Baz * or Foo *.  The use of pointers in this context is an implementation detail.

_____
Rob Stewart                           robert.stewart_at_[hidden]
Software Engineer, Core Software      using std::disclaimer;
Susquehanna International Group, LLP  http://www.sig.com

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