函數指針

在C中

#include "stdio.h"

int foo(int a)
{
    printf("This is foo => %d\n",a);
}

int foo2(int a)
{
     printf("This is foo2 => %d\n",a);
}

int main()
{
     int (*pFunction)(int) = foo;         //宣告pFunction指針是int (*)(int)函數指針且為初值為foo函數
     pFunction(100);                          //<=印出 This is foo => 100
     pFunction = foo2;
     pFunction(200);                        //<=印出 This is foo2 => 200

     return 0;
}
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在C++的類別中

class Neo
{
public:
    void (*pFun)();
    void go(void);
};
在函式中可用void(Neo::*pFun)() = &Neo::go;指定函數
在同類別中用(this->*pFun)();來呼叫
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類別函數指標

class Neo
{
public:
void go1(void);
void go2(void);
}
//先宣告成員函數指標
typedef void (Neo::*pfun)();
//再宣告結構體的方式
typedef struct ActionStruct
{
ptr function;
char* name;
} AS;

接著再cpp先註冊函數表
AS Actions[] =
{
{ &Neo::go1, "go1"},
{ &Neo::go2, "go2"}
};

呼叫方式如下
(this->*(Actions[1].function))();
char *functionName = Actions[1].name;