Re: [boost] Re: Re: Re: More Boost.Test problems

From: Tom Howard (tomhoward_at_[hidden])
Date: 2002-08-20 10:21:44

> > > gcc fails to compile following code:
> > >
> > > // ****************** start ******************
> > > template<typename FPT, typename ToleranceSource>
> > > inline bool
> > > compare_and_continue_impl( FPT left, FPT right, ToleranceSource
> > > tolerance_src )
> > > {
> > >     close_at_tolerance<FPT> pred( tolerance_src );
> > > }
> > > // ****************** end ******************
> > >
> > > Here an error:
> > > a.cpp: In function `bool compare_and_continue_impl(FPT, FPT,
> > > ToleranceSource)':
> > > a.cpp:6: parse error before `>' token
> > >
> > > Does it correct?
> >
> > "Is it correct?" Quite possibly. If that's the whole translation unit,
>
> then
>
> > yes, it's quite correct. There's no definition for close_at_tolerance.
>
> But compare_and_continue_impl is not called. and should not be instantiated
> accordingly, isn't it?

I'm pretty new to boost and I haven't don't a lot of template programming.  I 
might be completely wrong but replacing

    close_at_tolerance<FPT> pred( tolerance_src );

with

    template close_at_tolerance<FPT> pred( tolerance_src );

may solve the problem.  I remember coming across a very similar problem in 
code I was working on a few months ago and I think this is how I solved it.  
I might be completely wrong

>From my understanding, gcc isn't actually instatiating the 
compare_and_continue_impl template, it's just in the process of parsing the 
code itself when it produces the parse error.

Hope the above helps.

Cheers,

Tom Howard