56 lines
813 B
C
56 lines
813 B
C
/**
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* @file c_examp.c
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* @brief C实现多态
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* @author 光城
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* @version v1
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* @date 2019-08-06
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*/
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#include <stdio.h>
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/// Define a pointer of function
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typedef void (*pf) ();
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/**
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* @brief parent class
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*/
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typedef struct _A
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{
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pf _f;
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}A;
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/**
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* @brief child class
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*/
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typedef struct _B
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{
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A _b; ///< The inheritance of the parent class can be realized by defining an object of the base class in the subclass
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}B;
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void FunA()
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{
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printf("%s\n","Base A::fun()");
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}
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void FunB()
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{
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printf("%s\n","Derived B::fun()");
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}
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int main()
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{
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A a;
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B b;
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a._f = FunA;
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b._b._f = FunB;
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A *pa = &a;
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pa->_f();
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pa = (A *)&b; /// The parent class pointer points to the object of the subclass. Because of the type mismatch, it needs to be forced
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pa->_f();
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return 0;
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}
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