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1¡¢¶¨Ò庯ÊýÖ¸ÕëÀàÐÍ
// ¶¨ÒåÒ»¸öÔ­ÐÍΪint Fun( int a );µÄº¯ÊýÖ¸Õë
typedef int (*PTRFUN) ( int aPara );
2¡¢º¯ÊýÖ¸Õë±äÁ¿µÄ¶¨Òå
PTRFUN pFun;    // pFun Ϊº¯ÊýÖ¸Õë±äÁ¿Ãû
int (*pFun2) ( int a );   // pFun2Ò²ÊǺ¯ÊýÖ¸Õë±äÁ¿Ãû
3¡¢º¯ÊýÖ¸Õë×÷Ϊº¯ÊýµÄ²ÎÊý´«µÝ
// ¶¨Ò廨µ÷º¯Êý
int CallBack( int a ){
    return ++a;
}
// ¶¨Ò廨µ÷Õߺ¯Êý
void Caller( PTRFUN cb )
// void Caller( int (*cb) ( int ) ) // Ò²¿ÉÕâÑùÉêÃ÷
{
    int nPara = 1;
    int nRet = cb( nPara );
}
// ʹÓûص÷
void Test(){
    Caller( CallBack ); // Ö±½ÓʹÓûص÷º¯Êý
    PTRFUN cb = CallBack; // int (*cb) ( int ); cb = CallBack;
    int nRet1 = cb( 99 ); // nRet1 = 100;
}
4¡¢º¯ÊýÖ¸ÕëµÄÖ¸ÕëʹÓÃ
// ¶¨Ò庯ÊýÖ¸ÕëµÄÖ¸Õë
typedef int (**PTRPTRFUN) ( int aPara );
// º¯ÊýÖ¸ÕëµÄÖ¸Õë×÷Ϊ²ÎÊý
void PtrCaller( PTRPTRFUN cb )
// void PtrCaller( PTRFUN* cb )           // Ö¸ÕëÉêÃ÷
// void PtrCaller( int (**cb) ( int ) ) // Ô­ÐÍÉêÃ÷
{
    int nRet = (*cb)(999); // nRet = 1000;
}
// ʹÓú¯ÊýÖ¸ÕëµÄÖ¸Õë
void Test(){
    PTRFUN cb = CallBack;
    PtrCaller( &cb );
}
5¡¢º¯ÊýÖ¸ÕëÊý×éµÄʹÓÃ
// º¯ÊýÖ¸ÕëÊý×éµÄ¶¨Òå
PTRFUN fArray[10];
// int (*fArray[10]) ( int );   // Ô­ÐͶ¨Òå
for ( int i = 0; i < 10; i++ ){
    fArray[i] = CallBack;
    int nRet = fArray[i](i);    // nRet = i+1;
}
6¡¢º¯ÊýÖ¸ÕëµÄ´óС
// ¼ÈÈ»½ÐÖ¸Õ룬ËùÒÔ¸úÆÕͨµÄÖ¸ÕëÒ»ÑùÔÚ32λϵͳÏ´óС¶¼Îª4
int nSz1 = sizeof(PTRFUN);      // nSz1 = 4;
int nSz2 = sizeof(PTRPTRFUN);   // nSz2 = 4;
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