virtual

Let's suppose we have a base class which has a virtual method: class BaseClass { virtual void MethodToOverride() const { DoSomething(); } }; And a derived class which overrides the method (depending on the situation we can make it again virtual or not): class DerivedClass : public BaseClass { void MethodToOverride() const { DoSomethingElse(); } } If we make a mistake, for example defining the MethodToOverride non const or with a wrong character, we simply define a new method, for example: void MethodToOverride() {} // I forgot the const void MthodToOverride() const {} // I made a typo So this

How can I convert a path like \Device\HarddiskVolume3\Windows into its corresponding virtual path? (like c:\Windows in this case) Personally I prefer the native way: function GetHDDDevicesWithDOSPath:TStringlist; var i: integer; root: string; device: string; buffer: string; begin setlength(buffer, 1000); result:=TStringlist.create; for i := Ord('c') to Ord('z') do begin root := Char(i) + ':'; if (QueryDosDevice(PChar(root), pchar(buffer), 1000) <> 0) then begin device := pchar(buffer); result.add(format('%s = %s\',[device, root ])); end; end; end; NB : This code sample is taken from: http:/

父类子类指针相互转换问题 1.当自己的类指针指向自己类的对象时，无论调用的是虚函数还是实函数，其调用的都是自己的： 2.当指向父类对象的父类指针被强制转换成子类指针时候，子类指针调用函数时，只有非重写函数是自己的，虚函数是父类的； 3.当指向子类对象的子类指针被强制转换成父类指针的时候，也就是父类指针指向子类对象，此时，父类指针调用的虚函数都是子类的，而非虚函数都是自己的； 将上面三句话总结成一句话就是： 当父类子类有同名非虚函数的时候，调用的是转换后的指针类型的函数； 　　　　　　　　　　　　　　当父类子类有同名虚函数的时候呢，调用的是指针转换前指向的对象类型的函数。 详见以下代码： 1 #include <iostream> 2 using namespace std; 3 class Base { 4 public: 5 virtual void f() { cout << "Base::f" << endl; } 6 virtual void g() { cout << "Base::g" << endl; } 7 void h() { cout << "Base::h" << endl; } 8 9 }; 10 class Derived:public Base 11 { 12 public: 13 virtual void f(){cout<<"Derived::f"<

I've got a little class hierarchy where each class corresponds to a certain TComponent descendent (say base class TDefaultFrobber with descendents TActionFrobber and TMenuItemFrobber, corresponding to TComponent, TCustomAction and TMenuItem, respectively). Now I want a factory (?) function something like this: function CreateFrobber(AComponent: TComponent): IFrobber; begin if AComponent is TCustomAction then Result := TActionFrobber.Create(TCustomAction(AComponent)) else if AComponent is TMenuItem then Result := TMenuItemFrobber.Create(TMenuItem(AComponent)) else Result := TDefaultFrobber

How can Meteor handle multiple Virtual Hosts? www.Some-Client-Domain.com --> www.Our-CName-URL.com --> Meteor app. We need the Meteor app to serve the same site/app but with data specific to the original URL requested (Some-Client-Domain.com). In our current prototype, we have NGINX in front of Rails, and there are a few different ways to do this, including wiring NGINX to the DB for definitions of the MANY Virtual Hosts. This works great, because if a new client signs up, we can update the DB, and then NGINX immediately knows about that Virtual Host without any further NGINX configuration.

I am trying to access a Virtual Directory folder from Code-behind. ASP.Net Website Name : SuperImages Physical folder : C:\images Virtual Directory folder : allimages (In same level as App_Data, Scripts, Properties folders) I am trying to access and do a count of the number of items in this folder, then display them on a webpage. How should I do this? Thanks in advance! ======================================================================= Update : From the posts below, it seems that Server.MapPath would give me the correct physical path. However, it seems to me that I am getting the wrong

I don't want to show the virtual keyboard. I tried the below method but it doesn't make any difference. InputMethodManager imm = InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE); imm.hideSoftInputFromWindow(enter_count.getWindowToken(), 0); enter_count is my edit text I have tried reading up on the InputMethod Manager but can't follow it. I can set the input type of my edit text called enter_count as follows enter_count.setInputType( InputType.TYPE_NULL ); but then I can't specify to only accept numeric input Can you please give me a reasonable solution to simply not show the