Re: class extension for C

From:

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

Newsgroups:

comp.lang.c++

Date:

Fri, 14 Mar 2008 20:31:56 -0700 (PDT)

Message-ID:

<a1b11e2c-e57c-4b60-b39d-910b58caa713@k13g2000hse.googlegroups.com>

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 k=

now

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

processor that I can modify without to much trouble)

<snip>

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

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

the

classes are global static structs).

I just want to be able to write a bit more logical code in C with a litt=

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)) );
}

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