Re: [sigc] libsigc++ & Forte: template operator()

[Martin Schulze <martin-ml hippogriff de>]

Am 2004.03.20 17:38 schrieb(en) Murray Cumming:
> On Sat, 2004-03-20 at 14:30, Martin Schulze wrote:
> > > My SUN Forte C++ 5.3 and 5.4 still get stuck on
> > >
> > > CC -DHAVE_CONFIG_H -I.. -I.. -g -c signal.cc  -KPIC -DPIC -o
> > > .libs/signal.o
> > > "../sigc++/functors/functor_trait.h", line 48: Error: Function
> > > templates
> > > may not  have default template parameters.
> >
> > This is utter nonsense.
>
> Well, it does look like an unusual technique.

We are using it in several places. It allows us to distinguish
between classes that do or don't inherit from functor_base /  
adaptor_base / lambda_base transparently. I'm not sure how to hack  
around this compiler bug and whether it's worth the effort. I suggest  
that we first decide what to do about the ".template operator()<...>()"  
problem.

Regards,

 Martin


> >  Again it is pure guesswork to figure out
> > what keeps the FORTE from compiling. I tried to create a test to
> > reproduce the error (test_functor_trait1.cc) and a possible
> > solution (test_functor_trait2.cc).
>
> Sorry, both fail:
>
> bash-2.03$ CC test_functor_base11.cc
> Could not open input file "test_functor_base11.cc".
> bash-2.03$ CC test_functor_base1.cc
> "test_functor_base1.cc", line 88: Error: Function templates may not
> have
> default template parameters.
> "test_functor_base1.cc", line 88: Error: Templates can only declare
> classes or functions.
> "test_functor_base1.cc", line 91: Error: Use ";" to terminate
> statements.
> "test_functor_base1.cc", line 92: Error: T_functor is not defined.
> "test_functor_base1.cc", line 93: Error: A declaration was expected
> instead of "}".
> "test_functor_base1.cc", line 100: Error: No primary specialization
> for
> partial specialization functor_trait.
> 6 Error(s) detected.
> bash-2.03$
> bash-2.03$
> bash-2.03$
> bash-2.03$ CC test_functor_base2.cc
> "test_functor_base2.cc", line 88: Error: Function templates may not
> have
> default template parameters.
> "test_functor_base2.cc", line 88: Error: Templates can only declare
> classes or functions.
> "test_functor_base2.cc", line 96: Error: No primary specialization  
> for
> partial specialization functor_trait.
> "test_functor_base2.cc", line 98: Error: Too many arguments for
> template
> functor_trait.
> 4 Error(s) detected.
> bash-2.03$
>
>
> >  If this fails, maybe
> > is_base_and_derived<> is still causing troubles. To check this,
> > I have attached test_base_and_derived.cc. Hopefully the tests
> > lead to some result.
>
> That builds without problems.
>
> --
> Murray Cumming
> www.murrayc.com
> murrayc murrayc com