binary B+ tree - first attempt, compiles and runs

[svn/Cll1h/.git] / demos / ansi-c / objects-c.c

#include <stdio.h>
#include <malloc.h>

#define CONFEDERATION(IFACE,TYPE) struct IFACE *interface;struct TYPE *next
#define CREATE(TYPE) (struct TYPE *)malloc(sizeof(struct TYPE))
#define APPEND(TYPE,MEMBER,LIST) (MEMBER?MEMBER->next=(struct TYPE *)LIST:0,LIST=(struct TYPE *)MEMBER)

struct Drawable_data
{
 CONFEDERATION(Drawable_interface,Drawable_data);
};

struct Drawable_interface
{
 void (*draw)(void *self);
};

struct Tri
{
 CONFEDERATION(Drawable_interface,Drawable_data);
 int x1; int y1; int x2; int y2; int x3; int y3;
};

struct Rect
{
 CONFEDERATION(Drawable_interface,Drawable_data);
 int x1; int y1; int x2; int y2;
};

void draw_tri(void *_self)
{
 struct Tri *self=(struct Tri *)_self;
 printf("%d,%d - %d,%d - %d,%d\n",self->x1,self->y1,self->x2,self->y2,self->x3,self->y3);
};

void draw_rect(void *self)
{
 struct Rect *r=(struct Rect *)self;
 printf("%d,%d - %d,%d\n",r->x1,r->y1,r->x2,r->y2);
};

struct Drawable_interface *init_tri_interface(void)
{
 struct Drawable_interface *i=CREATE(Drawable_interface); 
 /* vsechny metody je bohuzel potreba bindnout rucne, neda se svitit... */
 if(i) i->draw=draw_tri;
 return i;
}

struct Drawable_interface *init_rect_interface(void)
{
 struct Drawable_interface *i=CREATE(Drawable_interface); 
 /* vsechny metody je bohuzel potreba bindnout rucne, neda se svitit... */
 if(i) i->draw=draw_rect;
 return i;
}

struct Tri *create_tri(struct Drawable_interface *i, int x1, int y1, int x2, int y2, int x3, int y3)
{
 struct Tri *t=CREATE(Tri);
 if(i && t) 
 {
  t->interface=i;
  t->x1=x1;t->y1=y1;t->x2=x2;t->y2=y2;t->x3=x3;t->y3=y3;
 }
 return t;
}

struct Rect *create_rect(struct Drawable_interface *i, int x1, int y1, int x2, int y2)
{
 struct Rect *r=CREATE(Rect);
 if(i && r) 
 {
  r->interface=i;
  r->x1=x1;r->y1=y1;r->x2=x2;r->y2=y2;
 }
 return r;
}

int main(void) 
{
 struct Drawable_interface *tri_interface=init_tri_interface();
 struct Drawable_interface *rect_interface=init_rect_interface();
 struct Drawable_data *all=NULL,*one;
 struct Tri *t;
 struct Rect *r; 
 
 r=create_rect(rect_interface,0,10,1,11);
 APPEND(Drawable_data,r,all);
 t=create_tri(tri_interface,0,0,0,4,3,0);
 APPEND(Drawable_data,t,all);
 r=create_rect(rect_interface,10,0,11,1);
 APPEND(Drawable_data,r,all);

 /* a nyni ... bylo to hodne prace, ale povedlo se ... ! */

 for(one=all;one;one=one->next) (*(one->interface->draw))(one);

 /* a nyni pro efekt jeste instatni nudlovy kod s kanci prichuti: */
 
#define _(OBJECT,METHOD) OBJECT==NULL)?0:(*(OBJECT->interface->METHOD))(OBJECT
#define FOR_EACH(ONE,ALL)  for(ONE=ALL;ONE;ONE=ONE->next)

 FOR_EACH(one,all) (_(one,draw));

 return 0;
}