Re: function: defarg_test

From: Gennadiy E. Rozental (rogeeff_at_[hidden])
Date: 2001-08-22 15:00:58

Hi!

I got it!!!

Reason is that I turned on following flags: -g +d
I wanted to prevent expanding inline functions for debuging. Looks 
like Sun workshop has a problem with it.

Gennadiy. 

--- In boost_at_y..., Douglas Gregor <gregod_at_c...> wrote:
> Hello Gennadiy,
> 	I'm not sure I quite understand the error message. It appears 
that the 
> linker is not finding the constructors for the boost::function 
objects. My 
> inclination is to tell you to ignore the testcase failure and not 
to use 
> default arguments.
> 	This is somewhat of a grey area, and I can't tell you with 
confidence that 
> defarg_test is standards-conforming. The problem boils down to:
> 
> template<typename F>
> void foo(F f) { f(1); }
> 
> void bar(int i, int j = 5, int k = 7);
> void wibble(int i, int j, int k);
> 
>   foo(&bar);    // #1
>   foo(&wibble); // #2
> 
> #1 causes foo to be instantiated with F=void (*)(int, int, int), 
even though 
> it is called with only one argument. #2 has the same type (default 
arguments 
> are not part of the type), so the instantiation of foo for #1 is 
the same for 
> #2, even though wibble(1) is not well-formed. I have yet to see a 
compiler 
> catch this error. Also note that with every compiler I tried, if 
wibble gets 
> default arguments for j and k, the wrong values are used.
> 
> 	My advice is to not rely on the use of default arguments. 
They appear to be 
> unpredictable on many (good) compilers.
> 
> 	Doug
> 
> On Wednesday 22 August 2001 01:01, you wrote:
> > Hi,
> >
> > Trying to compile function: defarg_test on Sun with SunWorkshop 6 
u.1
> >
> > I am sure I was able to compile it week ago. But now I am getting
> > this weird error during linking:
> >
> > Undefined			first referenced
> >  symbol  			    in file
> > 
boost::function0<int,boost::empty_function_policy,boost::empty_functio
> > n_mixin,_STL::allocator<boost::function_base> >::function0<int(*)
> > (int,int,int)>#Nvariant 1(const
> > __type_4&) ./build_dev/o.sun/defarg_test.o
> > 
boost::function2<int,int,int,boost::empty_function_policy,boost::empty
> > _function_mixin,_STL::allocator<boost::function_base> 
>::function2<int
> > (*)(int,int,int)>#Nvariant 1(const
> > __type_6&) ./build_dev/o.sun/defarg_test.o
> > 
boost::function1<int,int,boost::empty_function_policy,boost::empty_fun
> > ction_mixin,_STL::allocator<boost::function_base> >::function1<int
(*)
> > (int,int,int)>#Nvariant 1(const
> > __type_5&) ./build_dev/o.sun/defarg_test.o
> > ld: fatal: Symbol referencing errors. No output written to
> > build_dev/d.sun/defarg_test
> >
> > I am fighting with it second day.
> >
> > Any ideas?
> >
> > Thank you,
> >
> > Gennadiy.
> >
> >
> >
> >
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