Hello to all,

I would like to know if we can define a sub-routine to be nul, so that when compiling this routine hold no is what a macro do, but macros aren't implemented yet in FPC.
This could be used, for example, in a C-like "assert" function that when NDEBUG is defined the function is inserted, and when it isn't the function waste no space. I include a DJGPP version of the function prototype. In other words; this is equivalent to the lines below, but is easier to write, and looks much better in your source:
{$IFDEF NDEBUG}

  Assert(blabla);

{$ENDIF}

Best Regards,
IoDream.

FPC supports Assert. If you compile without -Sa it is ignored.

OK, that's good ! Thanks !

But I would like to do the same with some profiling subroutines. You understand: if I compile with the symbol PROFILE defined all the profiling code is compiled, and if the symbol is undefined then no extra code is generated.

Any idea ?

You can use macros. Of course, this requires that you include the macro definition in all files and compile with -Sm.

{$ifdef profiling}
{$define profile_code:=myprofileprocedure}
{$else profiling}
{$define profile_code:= }
{$endif profiling}

I'am not sure if the docs contain info about macros.

Remark that FPC macros doesn't support parameters as in C. If someone has to time to implement this, feel free to do so :)....

Hi all,

Question: How big is the vmt of a class?

I have a class and want to create a descendent tried copying a vmt of an existing descendent and it works fine. But I don't know exactly how big the vmt is. AFAIK the beginning of the structure of a vmt is described in rtl/inc/objpash.inc, but what about the rest?

thx in advance,
Mattias