(j3.2006) procedure declaration and elementals

Van Snyder Van.Snyder
Fri Mar 13 18:15:52 EDT 2009

On Fri, 2009-03-13 at 11:44 -0700, Bill Long wrote:
> I got this test case:
> program f2003_procptr_1
>   implicit none
>   real      :: pi = 3.14159265
>   intrinsic :: sin, cos
>   procedure(sin), pointer :: p => NULL ()
>   p => sin
>   print *, "sin(0), sin(pi/2) =", p(0.0), p(pi/2)
>   p => cos
>   print *, "cos(0), cos(pi)   =", p(0.0), p(pi)
> end program f2003_procptr_1
> The procedure declaration statement appears to violate C1219 
> (09-007:[291:26-27]).   What is the rationale for this constraint?  Is 
> the code nonconforming?

C732 prohibits a <proc-target> to be a nonintrinsic elemental procedure. says "<proc-target> may be an elemental intrinsic procedure
even if <proc-pointer-object> is not elemental.

Notwithstanding, it appears, however, that C1219 prohibits
elemental procedure pointers and elemental dummy procedures.  I think
instead of "shall specify an external procedure" it should have been

"C1219 (R1215) If <proc-interface> describes an elemental procedure,
<proc-entity-name> shall not be a <dummy-arg-name>."  There is nothing
similar, however, concerning interface bodies, i.e., nothing like

C1205a (R1205) An <interface-body> for a dummy procedure shall not
describe an elemental procedure interface."

While researching this, I came upon, which ends "...may be
associated with a dummy procedure (which is prohibited from being

I couldn't find where dummy procedures are prohibited from being
elemental (I looked at every occurrence of "elemental" in 09-007).  I'm
confident we had something explicit at some time.  I also looked through
04-007 and couldn't find it.  If it actually has escaped, we need
something like

"C1255a (R1230) A <dummy-argument-name> shall not be the name of an
elemental dummy procedure."

which would be better than saying it twice, in C1205a and C1219.

> Cheers,
> Bill

More information about the J3 mailing list