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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

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