Re: forloop doesn't take define?

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"Robby" <Robby@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:D31E6B50-8298-40F1-8EC0-6BF72CDB6999@xxxxxxxxxxxxxxxx
oaoaoaoh!
me double stupid!

Thankyou for your help fellows !

--
Best regards
Roberto


"Igor Tandetnik" wrote:

Robby <Robby@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
c:\_DTS_PROGRAMMING\C_PROGRAMMING\c\ARRAYSIZES\test.cpp(29): error
C2296: '/' : illegal, left operand has type 'long [5]'

#define SX (sizeof((obj_M->pCOLL[0].SFI) /
(sizeof(obj_M->pCOLL[0].SFI[0]))))

I'm pretty sure you wanted to arrange the parentheses differently. For
clarity, let's replace obj_M->pCOLL[0].SFI with A (for "array"):

#define SX (sizeof( (A) / (sizeof(A[0])) ))

So you try to do "A/sizeof(A[0])", and then apply sizeof to the result.
But of course A/sizeof(A[0]) is nonsense. You likely meant

#define SX ( sizeof(A) / sizeof(A[0]) )

See the difference?
--
With best wishes,
Igor Tandetnik

With sufficient thrust, pigs fly just fine. However, this is not
necessarily a good idea. It is hard to be sure where they are going to
land, and it could be dangerous sitting under them as they fly
overhead. -- RFC 1925




This dialogue is a perfect example of how newsgroups should function, so
hats off to you both.

I would just add that as your example has demonstrated, macros and complex
things get muddled (in a Pooh sense), the following in a header file saves
my bacon (or honey) time and again.

//

// A means of finding the size of a fixed array which also has the nice

// property that it fails if passed a pointer, unlike
(sizeof(pointer)/(pointer[0])).

//

//
http://groups-beta.google.com/group/microsoft.public.vc.ide_general/msg/cb86476c29a61072?dmode=source

//

template <typename Type, ::size_t nElements> inline

::size_t sizeof_array(const Type (&)[nElements])

{

return nElements;

}


.

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