多态测试通过

README.en.md

@@ -1,36 +0,0 @@
-# cmake_demo
-
-#### Description
-{**When you're done, you can delete the content in this README and update the file with details for others getting started with your repository**}
-
-#### Software Architecture
-Software architecture description
-
-#### Installation
-
-1.  xxxx
-2.  xxxx
-3.  xxxx
-
-#### Instructions
-
-1.  xxxx
-2.  xxxx
-3.  xxxx
-
-#### Contribution
-
-1.  Fork the repository
-2.  Create Feat_xxx branch
-3.  Commit your code
-4.  Create Pull Request
-
-
-#### Gitee Feature
-
-1.  You can use Readme\_XXX.md to support different languages, such as Readme\_en.md, Readme\_zh.md
-2.  Gitee blog [blog.gitee.com](https://blog.gitee.com)
-3.  Explore open source project [https://gitee.com/explore](https://gitee.com/explore)
-4.  The most valuable open source project [GVP](https://gitee.com/gvp)
-5.  The manual of Gitee [https://gitee.com/help](https://gitee.com/help)
-6.  The most popular members  [https://gitee.com/gitee-stars/](https://gitee.com/gitee-stars/)

README.md

@@ -12,4 +12,4 @@ C语言实现思路：
 | --- | --- | --- | --- |
 | 匿名结构体 | 指针 | 多重继承，成员可能冲突 | B->A, C->A, D->B,D->C|
 | 虚函数表 | 指针 | 子类父类必须将虚表放在结构体最开头，且不支持多继承下的多态 | |
-| 虚函数多参数 | 指针 | 继承的父类无顺序强制要求，且可以多继承。但类方法参数变多 | |
+| 虚函数多参数 | 指针 | 继承的父类无顺序强制要求，且可以多继承。但类方法参数变多。多继承需要人为注意是调用了其他类还是继承了其他类 | |

main.c

@@ -120,7 +120,8 @@ double rect_area(void *self, void *parent)
 
 void rect_draw(void *self, void *parent)
 {
-    printf("rect draw\n");
+    struct _rect *pthis = (struct _rect *)parent;
+    pthis->shape->vtb.draw(self, NULL);
 }
 
 double _rect_area(void *self, void *parent)
@@ -181,13 +182,27 @@ struct _circle
     // void (*draw)(void *self);
 };
 
-double circle_area(struct _circle *self, void *parent)
+double circle_area(void *self, void *parent)
 {
-    double area = 3.14 * self->radius * self->radius;
+    double area = 0;
+    struct _circle *pthis = (struct _circle *)parent;
+    area = pthis->shape->vtb.area(self, NULL);
+    return area;
+}
+void circle_draw(void *self, void *parent)
+{
+    struct _circle *pthis = (struct _circle *)parent;
+    pthis->shape->vtb.draw(self, NULL);
+}
+
+double _circle_area(void *self, void *parent)
+{
+    struct _circle *pthis = (struct _circle *)self;
+    double area = 3.14 * pthis->radius * pthis->radius;
     printf("circle area = %0.2f\n", area);
     return area;
 }
-void circle_draw(struct _circle *self, void *parent)
+void _circle_draw(void *self,  void *parent)
 {
     printf("circle draw\n");
 }
@@ -196,8 +211,8 @@ struct _circle *circle_new(double radius)
 {
     // super
     static struct _virtual_table vtb = {
-        .area = (double (*)(void *self, void *parent))circle_area,
-        .draw = (void (*)(void *self, void *parent))circle_draw,
+        .area = (double (*)(void *self, void *parent))_circle_area,
+        .draw = (void (*)(void *self, void *parent))_circle_draw,
     };
 
     struct _shape *shape = shape_new();
@@ -231,8 +246,14 @@ struct _copper_cash
 
 double copper_cash_area(struct _copper_cash *self, void *parent)
 {
-    double circle_area = self->circle->shape->vtb.area(self->circle, self->circle);
-    double rect_area = self->rect->shape->vtb.area(self->rect, self->rect);
+    // 如果用的继承，那么就不能直接调用父类的虚接口，实现自己。
+    // 因为父类虚接口，是自己实现的。这样相当于自己调用自己。导致卡死。
+
+    // double circle_area = self->circle->shape->vtb.area(self->circle, self->circle);
+    // double rect_area = self->rect->shape->vtb.area(self->rect, self->rect);
+
+    double circle_area = 3.14 * self->circle->radius * self->circle->radius;
+    double rect_area = self->rect->width * self->rect->height;
     double area = circle_area - rect_area;
 
     printf("copper cash area = %0.2f\n", circle_area - rect_area);
@@ -265,12 +286,14 @@ struct _copper_cash *copper_cash_new(double width, double height, double radius)
     {
         return NULL;
     }
+    rect->shape = shape;
 
     struct _circle *circle = circle_new(radius);
     if (circle == NULL)
     {
         return NULL;
     }
+    circle->shape = shape;
 
     // self
     struct _copper_cash *cc = calloc(1, sizeof(struct _copper_cash));
@@ -324,6 +347,10 @@ int main(int argc, char *argv[])
 
     printf("----- [2] copper_cash -----\n");
     rect_area(cc, cc->rect);
+    rect_draw(cc, cc->rect);
+
+    circle_area(cc, cc->circle);
+    circle_draw(cc, cc->circle);
 
     return 0;
 }