例子1：
#include
#include
#include
struct object ;
struct person
void study()
};struct dog
void bark()
};#define bless(object, type) ((type*) object)
int main()
// 程式執行時輸出：
// tom is person, he is sleeping
// tom is person, he is studying
// tom is dog, he is sleeping
// tom is dog, he is barking
// tom is person, he is sleeping
// tom is person, he is studying
例子2：
#include
#include
#include
class object ;
class person
void study()
};class dog
void bark()
};#define bless(object, type) ((type*) object)
int main()
// 程式執行時輸出：
// tom is person, he is sleeping
// tom is person, he is studying
// tom is dog, he is sleeping
// tom is dog, he is barking
// tom is person, he is sleeping
// tom is person, he is studying
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