cmake_demo/library/copper.c

#include "copper.h"

double copper_cash_area(struct _copper_cash *self, void *parent)
{
    // 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);
    return area;
}

void copper_cash_draw(struct _copper_cash *self, void *parent)
{
    printf("copper cash draw\n");
}


struct _copper_cash *copper_cash_new(double width, double height, double radius)
{
    // super
    static struct _virtual_table vtb = {
        .area = (double (*)(void *self, void *parent))copper_cash_area,
        .draw = (void (*)(void *self, void *parent))copper_cash_draw,
    };

    struct _shape *shape = shape_new();
    if (shape == NULL)
    {
        return NULL;
    }
    shape->vtb = vtb;

    struct _rect *rect = rect_new(width, height);
    if(rect == NULL)
    {
        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));
    if (cc == NULL)
    {
        return NULL;
    }
    cc->price = 100;
    // set parent
    cc->shape = shape;
    cc->rect = rect;
    cc->circle = circle;
    return cc;
}