C言語でクラスを作りたい。

Question

前提・実現したいこと

C言語で、オブジェクト指向のクラスのようなものを、マクロで作ろうとしているのですが、ガベージコレクション(みたいなもの)が、うまくできません。

該当のソースコード

#include<studio.h>
#define self void *cslf
void *cslf;
#define private(class_name) struct private_ ## class_name
#define public struct
#define classdef(class_name) typedef class_name* class_name; struct class_name instance_of_ ## class_name
#define funcAttach(class_name) void init_ ## class_name(void)
#define settings(class_name, parent_class) int myNumber; void(*delete)(void*); struct parent_class base; struct private_ ## class_name private
#define dtor(class_name) void class_name ## __delete(void *cslf)
#define new(class_name, args) classes[class_number] = calloc(sizeof(struct class_name), 1); do{if(class_number<510){memcpy(classes[class_number], &instance_of_ ## class_name, sizeof(struct class_name)); ((class_name)classes[class_number])->myNumber=class_number; cslf=classes[class_number]; class_name args; cslf=0; classes[class_number+1]=class_name ## __delete; class_number+=2; }else{free(classes[class_number]); classes[class_number]=0; }}while(0)
#define setThis(class_name) do{class_name this=(class_name)cslf;}while(0)
#define INIT(class_name, parent_class) instance_of_ ## class_name.delete=class_name ## __delete; instance_of_ ## _class_name=instance_of_ ## parent_class
#define Delete(object) do{object->delete(object); classes[object->myNumber]=0; free(object); }while(0)
typedef void *obj;
int depth = -1;
int class_number=0;
void *classes[512][512]{{0}};
struct No_superclass{
}
struct No_superclass instance_of_No_superclass;
void delete_garbage(void){
  for(int i=0;i<class_number;i+=2){
    if(classes[depth][i]!=0){
      void(*dlt)(void*)= classes[depth][i+1];
      dlt(classes[depth][i]);
      free(classes[depth][i]);
      classes[depth][i]=0;
    }
  }
  depth—;
  class_number=0;
}



/* クラス定義　*/
private(Human) {
  int age;
} public Human {
  char name[64];
  int(*getAge)(obj);
  void(*setAge)(obj, int);
}
dtor(Human) {
  setThis(Human);
  /* デストラクタ */
}
void Human__setAge(self, int age) {
  setThis(Human);
  this->private.age=age;
}
int Human__getAge(self) {
  setThis(Human);
  return this->private.age;
}
void Human(void) {
  setThis(Human);
  /* コンストラクタ */
}

int main(int argc, char** argv) {
  /* ブロックの始めでdepthを+1 */
  depth++;

  Human h = new(Human,());
  h.setAge(h, 57);
  printf("This human is %d years old.¥n", h.getAge(h));

  /* ブロックの最後でガベージを削除 */
  delete_garbage();
}

Comments

[退会済みユーザー]

C# は関係ないですよね。タグを外してください。

[y_waiwai]

で、しつもんはなんでしょうか

[m.ts10806]

起きている問題は何でしょうか。
「うまくいかない」は誰にも何も伝えない表現なので避けてください。

[cateye]

>C言語で、オブジェクト指向のクラスのようなもの・・・・意図は何でしょう？
>ガベージコレクション・・・実装の問題ですか？
参考：https://ja.wikipedia.org/wiki/%E3%82%AC%E3%83%99%E3%83%BC%E3%82%B8%E3%82%B3%E3%83%AC%E3%82%AF%E3%82%B7%E3%83%A7%E3%83%B3#%E5%AE%9F%E8%A3%85
C++使えないですか？

Answer 1

usr ~/Project/test % cc t1.c | grep error
t1.c:15:5: warning: no previous extern declaration for non-static variable 'depth' [-Wmissing-variable-declarations]
int depth = -1;
    ^
t1.c:15:1: note: declare 'static' if the variable is not intended to be used outside of this translation unit
int depth = -1;
^
t1.c:16:5: warning: no previous extern declaration for non-static variable 'class_number' [-Wmissing-variable-declarations]
int class_number=0;
    ^
t1.c:16:1: note: declare 'static' if the variable is not intended to be used outside of this translation unit
int class_number=0;
^
t1.c:17:24: error: expected ';' after top level declarator
void *classes[512][512]{{0}};
                       ^
                       ;
t1.c:18:1: warning: empty struct has size 0 in C, size 1 in C++ [-Wc++-compat]
struct No_superclass{
^
t1.c:18:1: warning: empty struct is a GNU extension [-Wgnu-empty-struct]
t1.c:19:2: error: expected ';' after struct
}
 ^
 ;
t1.c:24:13: warning: initializing 'void (*)(void *)' with an expression of type 'void *' converts between void pointer and function pointer [-Wpedantic]
      void(*dlt)(void*)= classes[depth][i+1];
            ^            ~~~~~~~~~~~~~~~~~~~
t1.c:26:7: warning: implicit declaration of function 'free' is invalid in C99 [-Wimplicit-function-declaration]
      free(classes[depth][i]);
      ^
t1.c:30:8: error: non-ASCII characters are not allowed outside of literals and identifiers
  depth—;
       ^
t1.c:30:3: warning: expression result unused [-Wunused-value]
  depth—;
  ^~~~~
t1.c:21:6: warning: no previous prototype for function 'delete_garbage' [-Wmissing-prototypes]
void delete_garbage(void){
     ^
t1.c:21:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
void delete_garbage(void){
^
static 
t1.c:39:2: error: expected ';' after struct
} public Human {
 ^
 ;
t1.c:43:2: error: expected ';' after struct
}
 ^
 ;
t1.c:44:1: warning: declaration shadows a variable in the global scope [-Wshadow]
dtor(Human) {
^
t1.c:9:60: note: expanded from macro 'dtor'
#define dtor(class_name) void class_name ## __delete(void *cslf)
                                                           ^
t1.c:3:7: note: previous declaration is here
void *cslf;
      ^
t1.c:45:11: error: must use 'struct' tag to refer to type 'Human'
  setThis(Human);
          ^
          struct 
t1.c:11:32: note: expanded from macro 'setThis'
#define setThis(class_name) do{class_name this=(class_name)cslf;}while(0)
                               ^
t1.c:45:11: error: use of undeclared identifier 'Human'
t1.c:44:1: warning: unused parameter 'cslf' [-Wunused-parameter]
dtor(Human) {
^
t1.c:9:60: note: expanded from macro 'dtor'
#define dtor(class_name) void class_name ## __delete(void *cslf)
                                                           ^
・・・Omit・・・

fatal error: too many errors emitted, stopping now [-ferror-limit=]
20 warnings and 20 errors generated.

※Cを基礎から勉強し直して下さい。GCなんてまだ早いです。

Comments

[cateye]

色々有りますが、記述のおかしい所↓
int depth = -1;　・・・何故-1から？
・・・
void *classes[512][512]{{0}};・・・これは初期化ですか？
↑に付いては、lintも解析諦めたｗ
usr ~/Project/test % lint t1.c
Splint 3.1.2 --- 20 Feb 2018

Command Line: Setting +showcolumn redundant with current value
t1.c:17:25: Parse Error: Non-function declaration: classes :
void * [512][512]. (For help on parse errors, see splint -help parseerrors.)
*** Cannot continue.

[cateye]

エラーチェック強めですが・・・エラーが多すぎます（コンパイラが文句言っているｗ）
＆多すぎて貼り付けられなかった＾＾；
環境はLinuxmit19.3+Clang-10
・・・最近は、机上デバッグなんてしないんでしょうか？

[cateye]

（使える環境なら）-Eオプションを指定して、マクロの展開も確認しましょう。