Re: A question to the "access-type lifetime rule"

[Gautier <gautier.demontmollin@maths.unine.ch>]

Bernd Rinn:

As other replies point out, the generic approach is the best.

  generic
  with function Integrand_Type( X : Long_Float ) return Long_Float;
  function Integrate(Lower_Bound, Upper_Bound: Long_Float) return Long_Float;

Not only for avoiding any bad surprise with pointers, robustness or Ada-style,
but also for efficiency reasons: according to the function you plug in as generic
parameter, the contents of that function will be inlined into the "Integrate"
function, plus optimised by the compiler. Reversely, each reference to a pointer
to a function will be at least an indirection slower than the generic version.

HTH
______________________________________________________
Gautier  --  http://members.xoom.com/gdemont/gsoft.htm