[cpp-threads] RE: Initial comments on your straw man

[Nick Maclaren]

"Boehm, Hans" <hans.boehm at hp.com> wrote:
> 
>  f(&i) + f(&i)       -- yes, otherwise lots of stuff is broken
>
> I really don't see how you can outlaw the third case and be left with a
> reasonable programming language.  If I understand correctly, you would
> have to be able to see through all sorts of abstraction boundaries to
> know whether it is legal to use two function calls in the same
> xpression.

Not at all - it's trivial.  All you have to do is to demand that the
language is purely functional :-)

Seriously.  You can also do it in a non-functional language; Fortran
permits two function calls to be executed in parallel, as it defines
that any clash of side-effects is undefined behaviour.  To achieve
what C/C++/Algol 68 do, you must use subroutines in Fortran.

As far as C++ goes - don't try to get there from here.


Regards,
Nick Maclaren,
University of Cambridge Computing Service,
New Museums Site, Pembroke Street, Cambridge CB2 3QH, England.
Email:  nmm1 at cam.ac.uk
Tel.:  +44 1223 334761    Fax:  +44 1223 334679