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C++实现动态绑定代码分享

C实现动态绑定代码分享123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778#include iostream#includestringusingnamespacestd;classBookItem{private:string bookName;size_tcnt;public:BookItem(conststrings,size_tc,doublep):bookName(s),cnt(c),price(p){}~BookItem(){}protected:doubleprice;public:doublebookPrice(){returnthis-price;}string getBookName(){returnthis-bookName;}size_tgetBookCount(){returnthis-cnt;}virtualdoublemoney(){returncnt*price;}virtualvoidcostMoney(){coutmoney()endl;}};classBookBatchItem:publicBookItem{private:string bookName;size_tcnt;public:BookBatchItem(conststrings,size_tc,doublep,doublediscountRate):BookItem(s,c,p),cnt(c),discount(discountRate){}~BookBatchItem(){}private:doublediscount;public:doublemoney(){if(cnt10)returncnt*price*(1.0-discount);elsereturncnt*price;}voidcostMoney(){coutmoney()endl;// coutcntendl;// coutpriceendl;// coutdiscountendl;// cout...endl;}};intmain(){BookItem b1(Uncle Toms house,11,12.5);b1.costMoney();BookBatchItem b2(Gone with wind,11,12.5,0.12);b2.costMoney();BookItem* pbb1;pb-costMoney();pbb2;pb-costMoney();return0;}只有采用“指针-函数()”或“引用.函数()”的方式调用C类中的虚函数才会执行动态绑定非虚函数并不具备动态绑定的特征不管采用任何方式调用都不行。下面代码中一个java或者C#的程序员容易犯的一个错误。1234567891011121314151617181920212223242526classBase{public:Base() { p newchar; }~Base() {deletep; }private:char* p ;};classDerived:publicBase{public:Derived() { d newchar[10] ; }~Derived() {delete[] d; }private:char* d ;};intmain(){Base *pA newDerived();deletepA ;Derived *pA newDerived();deletepA ;}代码中执行delete pA时直接执行~Base析构函数不会执行~Derived析构函数的原因在于析构函数不是虚函数。执行delete pB时先执行~Derived()然后再执行~Base()。相比之下java和C#中所有的函数调用都是动态绑定的。关于C的成员函数调用与绑定方式可以通过下面的代码测试123456789101112131415161718192021222324252627classBase{public:virtualvoidFunc() { coutBaseendl; }};classDerived:publicBase{public:virtualvoidFunc() { coutDerivedendl; }};intmain(){Derived obj;Base * p1 obj;Base p2 obj;Base obj2 ;obj.Func() ;//静态绑定Derived的funcp1-Func();//动态绑定Derived的func(*p1).Func();//动态绑定Derived的funcp2.Func();//动态绑定Derived的funcobj2.Func();//静态绑定Base的funcreturn0 ;}复制讲解可以看出“对象名.函数()”属于静态绑定当然使用指针转换为对象的方式应该属于指针调用那一类了至于“类名::函数()”毫无疑问属于静态绑定。yip.hfnrh.pro/37997.Docyip.hfnrh.pro/53931.Docyip.hfnrh.pro/35577.Docyip.hfnrh.pro/99179.Docyip.hfnrh.pro/99939.Docyip.hfnrh.pro/15593.Docyip.hfnrh.pro/59915.Docyip.hfnrh.pro/37379.Docyip.hfnrh.pro/95373.Docyip.hfnrh.pro/99773.Docmec.hfnrh.pro/11575.Docmec.hfnrh.pro/11939.Docmec.hfnrh.pro/71173.Docmec.hfnrh.pro/95311.Docmec.hfnrh.pro/33959.Docmec.hfnrh.pro/37159.Docmec.hfnrh.pro/91715.Docmec.hfnrh.pro/53995.Docmec.hfnrh.pro/55555.Docmec.hfnrh.pro/55993.Docrep.hfnrh.pro/71775.Docrep.hfnrh.pro/57999.Docrep.hfnrh.pro/93197.Docrep.hfnrh.pro/55739.Docrep.hfnrh.pro/53793.Docrep.hfnrh.pro/53913.Docrep.hfnrh.pro/13779.Docrep.hfnrh.pro/75135.Docrep.hfnrh.pro/77359.Docrep.hfnrh.pro/93917.Docast.hfnrh.pro/79575.Docast.hfnrh.pro/33911.Docast.hfnrh.pro/11113.Docast.hfnrh.pro/17377.Docast.hfnrh.pro/35335.Docast.hfnrh.pro/75133.Docast.hfnrh.pro/53935.Docast.hfnrh.pro/95171.Docast.hfnrh.pro/51977.Docast.hfnrh.pro/95553.Docqhv.hfnrh.pro/95733.Docqhv.hfnrh.pro/53197.Docqhv.hfnrh.pro/77157.Docqhv.hfnrh.pro/57991.Docqhv.hfnrh.pro/35751.Docqhv.hfnrh.pro/59791.Docqhv.hfnrh.pro/15539.Docqhv.hfnrh.pro/91597.Docqhv.hfnrh.pro/53595.Docqhv.hfnrh.pro/77793.Dochok.hfnrh.pro/17193.Dochok.hfnrh.pro/35957.Dochok.hfnrh.pro/35799.Dochok.hfnrh.pro/93391.Dochok.hfnrh.pro/19375.Dochok.hfnrh.pro/71595.Dochok.hfnrh.pro/79937.Dochok.hfnrh.pro/93173.Dochok.hfnrh.pro/51539.Dochok.hfnrh.pro/73159.Docpdk.hfnrh.pro/37353.Docpdk.hfnrh.pro/19777.Docpdk.hfnrh.pro/99979.Docpdk.hfnrh.pro/91737.Docpdk.hfnrh.pro/71571.Docpdk.hfnrh.pro/17551.Docpdk.hfnrh.pro/59119.Docpdk.hfnrh.pro/19575.Docpdk.hfnrh.pro/99537.Docpdk.hfnrh.pro/51135.Doccxa.hfnrh.pro/39977.Doccxa.hfnrh.pro/57137.Doccxa.hfnrh.pro/79935.Doccxa.hfnrh.pro/99395.Doccxa.hfnrh.pro/99539.Doccxa.hfnrh.pro/19977.Doccxa.hfnrh.pro/35773.Doccxa.hfnrh.pro/99957.Doccxa.hfnrh.pro/13131.Doccxa.hfnrh.pro/75351.Docbjg.hfnrh.pro/97377.Docbjg.hfnrh.pro/79777.Docbjg.hfnrh.pro/75159.Docbjg.hfnrh.pro/95373.Docbjg.hfnrh.pro/55971.Docbjg.hfnrh.pro/39977.Docbjg.hfnrh.pro/53115.Docbjg.hfnrh.pro/39197.Docbjg.hfnrh.pro/79595.Docbjg.hfnrh.pro/79517.Docqts.hfnrh.pro/19771.Docqts.hfnrh.pro/31793.Docqts.hfnrh.pro/11191.Docqts.hfnrh.pro/53139.Docqts.hfnrh.pro/53139.Docqts.hfnrh.pro/99539.Docqts.hfnrh.pro/59911.Docqts.hfnrh.pro/59571.Docqts.hfnrh.pro/13311.Docqts.hfnrh.pro/59173.Docsrt.hfnrh.pro/33337.Docsrt.hfnrh.pro/11771.Docsrt.hfnrh.pro/71713.Docsrt.hfnrh.pro/77919.Docsrt.hfnrh.pro/17511.Docsrt.hfnrh.pro/55397.Docsrt.hfnrh.pro/57977.Docsrt.hfnrh.pro/93573.Docsrt.hfnrh.pro/79115.Docsrt.hfnrh.pro/75195.Doccgh.hfnrh.pro/15917.Doccgh.hfnrh.pro/97935.Doccgh.hfnrh.pro/33311.Doccgh.hfnrh.pro/35339.Doccgh.hfnrh.pro/53739.Doccgh.hfnrh.pro/93157.Doccgh.hfnrh.pro/59955.Doccgh.hfnrh.pro/99379.Doccgh.hfnrh.pro/79975.Doccgh.hfnrh.pro/15579.Dochv.hfnrh.pro/95551.Dochv.hfnrh.pro/35959.Dochv.hfnrh.pro/91791.Dochv.hfnrh.pro/39993.Dochv.hfnrh.pro/73511.Dochv.hfnrh.pro/79179.Dochv.hfnrh.pro/53773.Dochv.hfnrh.pro/73931.Dochv.hfnrh.pro/15391.Dochv.hfnrh.pro/57355.Docyid.hfnrh.pro/17171.Docyid.hfnrh.pro/93517.Docyid.hfnrh.pro/71971.Docyid.hfnrh.pro/95335.Docyid.hfnrh.pro/99173.Docyid.hfnrh.pro/33139.Docyid.hfnrh.pro/11511.Docyid.hfnrh.pro/39197.Docyid.hfnrh.pro/19539.Docyid.hfnrh.pro/97973.Doctrm.hfnrh.pro/35951.Doctrm.hfnrh.pro/97115.Doctrm.hfnrh.pro/59555.Doctrm.hfnrh.pro/55793.Doctrm.hfnrh.pro/15971.Doctrm.hfnrh.pro/59311.Doctrm.hfnrh.pro/33955.Doctrm.hfnrh.pro/33733.Doctrm.hfnrh.pro/93117.Doctrm.hfnrh.pro/53777.Docnbi.hfnrh.pro/17595.Docnbi.hfnrh.pro/93195.Docnbi.hfnrh.pro/11157.Docnbi.hfnrh.pro/55117.Docnbi.hfnrh.pro/71997.Docnbi.hfnrh.pro/59973.Docnbi.hfnrh.pro/17531.Docnbi.hfnrh.pro/19577.Docnbi.hfnrh.pro/51393.Docnbi.hfnrh.pro/53913.Doctde.hfnrh.pro/13911.Doctde.hfnrh.pro/77395.Doctde.hfnrh.pro/19935.Doctde.hfnrh.pro/75313.Doctde.hfnrh.pro/53339.Doctde.hfnrh.pro/79173.Doctde.hfnrh.pro/99559.Doctde.hfnrh.pro/17597.Doctde.hfnrh.pro/73375.Doctde.hfnrh.pro/31373.Docigk.hfnrh.pro/51139.Docigk.hfnrh.pro/11199.Docigk.hfnrh.pro/79991.Docigk.hfnrh.pro/51775.Docigk.hfnrh.pro/59517.Docigk.hfnrh.pro/73179.Docigk.hfnrh.pro/59175.Docigk.hfnrh.pro/91315.Docigk.hfnrh.pro/95935.Docigk.hfnrh.pro/33719.Docrfx.hfnrh.pro/59955.Docrfx.hfnrh.pro/31111.Docrfx.hfnrh.pro/79711.Docrfx.hfnrh.pro/75751.Docrfx.hfnrh.pro/13573.Docrfx.hfnrh.pro/39935.Docrfx.hfnrh.pro/33951.Docrfx.hfnrh.pro/39339.Docrfx.hfnrh.pro/73917.Docrfx.hfnrh.pro/71775.Dociep.hfnrh.pro/17795.Dociep.hfnrh.pro/57395.Dociep.hfnrh.pro/75975.Dociep.hfnrh.pro/95791.Dociep.hfnrh.pro/93591.Dociep.hfnrh.pro/77377.Dociep.hfnrh.pro/11959.Dociep.hfnrh.pro/95935.Dociep.hfnrh.pro/37519.Dociep.hfnrh.pro/77931.Docgcl.hfnrh.pro/37935.Docgcl.hfnrh.pro/59531.Docgcl.hfnrh.pro/19779.Docgcl.hfnrh.pro/75597.Docgcl.hfnrh.pro/97797.Docgcl.hfnrh.pro/71733.Docgcl.hfnrh.pro/55137.Docgcl.hfnrh.pro/99795.Docgcl.hfnrh.pro/97957.Docgcl.hfnrh.pro/93959.Docfbg.hfnrh.pro/37177.Docfbg.hfnrh.pro/39595.Docfbg.hfnrh.pro/79959.Docfbg.hfnrh.pro/93315.Docfbg.hfnrh.pro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