//13.7.1 對像指針問題(Object Pointer Problem)
//13.7.2 對像指針的外套(The Coat of Object Pointer)
//Sony Handle的應用

/*#include "createsony.h" #include "sonyhandle.h" #include <iostream> enum{PUREFLAT, PLASMA, LIQUIDCRYSTAL, NANOMETER};void fsh(SonyHandle& sh) { sh->adjustVolume(); sh->switchChannel(); }void createSonyObject(CreateSony* sp) { SonyHandle sh29(createSonyInch29(sp)); SonyHandle sh34(createSonyInch34(sp)); fsh(sh29); fsh(sh34); }int main() { if(CreateSony* sp = createCreateSony(PLASMA)){ createSonyObject(sp); delete sp; } system("pause"); return 0; }*/#include "createsony.h" #include "sonyhandle2.h" #include <iostream> enum{PUREFLAT, PLASMA, LIQUIDCRYSTAL, NANOMETER};void fsh(SonyHandle2& sh) {sh->adjustVolume();sh->switchChannel(); }void createSonyObject(CreateSony* sp) {SonyHandle2 sh29(createSonyInch29(sp));SonyHandle2 sh34(createSonyInch34(sp));fsh(sh29);fsh(sh34); }int main() {if(CreateSony* sp = createCreateSony(NANOMETER)){createSonyObject(sp);delete sp;}system("pause");return 0; }

　　

#ifndef HEADER_SONYHANDLE #define HEADER_SONYHANDLE #include "sony2.h"class SonyHandle {Sony* sp; public:Sony* operator->(){ return sp;}SonyHandle(Sony* pp) : sp(pp){};~SonyHandle(){} }; #endif;

　　

#ifndef HEADER_SONYHANDLE2 #define HEADER_SONYHANDLE2 #include "sony2.h"class SonyHandle2 {Sony* sp; //定義一個Sony的指針int* count;//定義一個整形變量 public:SonyHandle2(Sony* pp) : sp(pp),count(new int(1)){}; SonyHandle2(const SonyHandle2& sh):sp(sh.sp),count(sh.count){ (*count)++; }Sony* operator->(){ return sp;}SonyHandle2& operator+(const SonyHandle2& sh){if(sh.sp == sp) return *this; //本來就指向同一個對像的情況(*this).~SonyHandle2();sp = sh.sp;count = sh.count;(*count) ++;return *this;}//SonyHandle(Sony* pp) : sp(pp){};~SonyHandle2(){if(--(*count)==0){delete sp;delete count;}} }; #endif;

　　

總結

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