C + + Object-oriented advanced Programming (vii) Point-like classes and Function-like classes

Technology lies in communication, communication, reproduced please specify the source and maintain the integrity of the work.

The 1.pointer-like class is designed as a pointer and can be used as a pointer with two commonly used operators (* and-), so we have to overload both operations

    /*simple implementation of the * and-operator of the smart pointer*/Template <classT>classshared_ptr_test { Public: T&operator* ()Const //Reload *        {            return*px; } T*operator()Const //Heavy-duty        {            returnpx; } shared_ptr_test (T*p):p x (p) {}; Private: T* PX;//a pointer to class        LongPN;    }; structFoo {//    ...        voidMethodvoid) {};    }; intMain () {shared_ptr_test<Foo> SP (NewFoo); Foo F ((S2);//* Automatic destruction after function
Make PX point to Foo classSP->method ();//1.--- after the action continues to fill
2.== F->method (); Sp->method () will be converted to Px->method (), i.e. Foo::method ()                return 0; }

At this point, we can use the class as if it were a pointer.

2.function-like classes class can be used like a function, we must overload the Func operator call the [()] operator

Template<typename t>classlinefeed{ Public:    void operator()(ConstT &x) {cout<<x<<Endl; }};intMain () {inttmp[]={1,2,3,4,5}; For_each (tmp,tmp+5,linefeed<int>()); return 0;}

Output results

Reference << Houtie C + + Object-oriented advanced programming >>

C + + Object-oriented advanced Programming (vii) Point-like classes and Function-like classes