#3 lvalue forced in object method invocation macro

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

diff --git a/demos/objects/objects-wiki.c b/demos/objects/objects-wiki.c
index 127f959d096b9e74cc32483389f5767cb4af539a..8b6251af9462fe808ff53cf493eee8a6a08b4158 100644 (file)
--- a/demos/objects/objects-wiki.c
+++ b/demos/objects/objects-wiki.c
@@ -1,13 +1,15 @@
 #include "cll1.h"
 
 /* This is C<<1 rewrite of object polymorphism from
-   http://en.wikipedia.org/wiki/Polymorphism_in_object-oriented_programming */
+   http://en.wikipedia.org/wiki/Polymorphism_in_object-oriented_programming
+   
+   Of course there are easier ways to do the same thing... :-) 
+   (G)2008 xChas */
 
 def_type(Animal);
 
 def_mem(Actions)
 {
- void method(init) (Animal self, str name);
  str method(talk) (Animal self);
 };
 
@@ -17,42 +19,50 @@ def_obj(Animal)
  char *name;
 };
 
-Animal construct(Animal) (Animal self, str name)
+construct(Animal,Actions) (Animal self, str name)
 {
  self->name = name;
  return self;
 }
 
-str cat_talk(Animal self)
+/* implementation of methods */
+
+str catTalk(Animal self)
 {
  return "Meow!";
 }
 
-str dog_talk(Animal self)
+str dogTalk(Animal self)
 {
  return "Arf! Arf!";
 }
 
-Actions cat_actions(void)
+/* registration of methods to object interface */
+
+Actions catActions(void)
 {
- Actions this=get_mem(Actions);
- this->talk = cat_talk;
+ Get_mem(this, Actions);
+
+ this->talk = catTalk;
  return this;
 }
 
-Actions dog_actions(void)
+Actions dogActions(void)
 {
- Actions this=get_mem(Actions);
- this->talk = dog_talk;
+ Get_mem(this, Actions);
+
+ this->talk = dogTalk;
  return this;
 }
 
+/* usage of objects inside C<<1 program */
+
 program
 {
  int i;
  Animal animal[3];
- Actions cat = cat_actions();
- Actions dog = dog_actions();
+ Actions cat = catActions();
+ Actions dog = dogActions();
 
  animal[0] = get_obj(Animal, cat, "Missy");
  animal[1] = get_obj(Animal, cat, "Mr. Bojangles");
@@ -60,6 +70,7 @@ program
 
  for_range(i, 0, 2)
  {
-  printf("%s: %s\n", animal[i]->name, _(talk, animal[i]));
+  print(animal[i]->name, ":", _(talk, animal[i]));
  }
+
 }