Problem with generic interfaces.

[Steve Kargl]

On Wed, Nov 03, 2010 at 06:07:21AM +0100, Paul Richard Thomas wrote:
> > I have started to get problems with my generic interfaces, with
> > gfortran downloaded from
> > ftp://ftp.equation.com/gcc/gcc-4.6-20101030-32.exe.
> >
> > I have come to the conclusion that the problem might be related to
> > interfaces where I in the procedures have mixed a type and types
> > extended from that type.
> >
> > My question is then, is the following code legal?
> 
> No, gfortran tells you:
> gunnar.f90:9.37:
> 
>     module procedure testa_a, testa_b
>                                      1
> Error: Ambiguous interfaces 'testa_b' and 'testa_a' in generic
> interface 'testa' at (1)
> gunnar.f90:24.9:
> 
>  use test
>          1
> Fatal Error: Can't open module file 'test.mod' for reading at (1): No
> such file or directory
> 
> ifort opines:
> gunnar.f90(30): error #8032: Generic procedure reference has two or
> more specific procedure with the same type/rank/keyword signature.
> [TESTA]
>    call testa(b)
> --------^
> compilation aborted for gunnar.f90 (code 1)
> 
> >
> > (I can solve my problem by using type instead of class for my
> > declarations in the subroutines.)
> >
> 
> Indeed.  The ambiguity arises because instances of CLASS(a) can be of
> CLASS(b).  Which of test_a and test_b should chosen in this case?
> 
> Cheers
> 

Isn't this a TKR issue?   TKR = type, kind, rank.  A CLASS is not
a type, kind, or rank.

-- 
Steve