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| #include <stdio.h>
#include <malloc.h>
typedef struct myClass
{
void (*init)(struct myClass *self, int a, int b); //利用函数指针给变量赋值
void (*get)(struct myClass *self);
int var1; //public
int var2;
} mC;
typedef struct myClassB //继承
{
mC *parent;
void (*child)(); //子类自己的方法
} mCB;
static void child_()
{
printf("hello\n");
}
static void init_(mC *self, int a, int b)
{
self->var1 = a;
self->var2 = b;
}
static void get_(mC *self)
{
printf("this -> var1:%d\n", self->var1);
printf("this -> var2:%d\n", self->var2);
}
int main()
{
mC newMyClass;
newMyClass.init = init_; // 给结构体中的函数指针赋值
newMyClass.get = get_;
newMyClass.init(&newMyClass, 1, 2); // 两个对外接口
newMyClass.get(&newMyClass);
printf("newMyClass2\n");
mC newMyClass2;
newMyClass2.init = init_; // 给结构体中的函数指针赋值
newMyClass2.get = get_;
newMyClass2.init(&newMyClass2, 3, 4);
newMyClass2.get(&newMyClass2);
printf("childClass\n");
mCB childClass;
childClass.parent = &newMyClass; // 直接将父类指针指向已存在的父类对象nweMyClass
childClass.child = child_;
childClass.child();
childClass.parent->get(childClass.parent);
printf("childClass2\n");
mCB childClass2;
childClass2.parent = (mC *)malloc(sizeof(mC));
childClass2.parent->init = init_;
childClass2.parent->get = get_;
childClass2.parent->init(childClass2.parent, 10, 20);
childClass2.parent->get(childClass2.parent);
free(childClass2.parent);
printf("pointer to newMyClass2\n");
mC* ptr = &newMyClass2;
ptr->get(ptr);
printf("pointer to childClass\n");
ptr = childClass.parent; //函数重载
ptr->get(ptr);
}
|