Initializing constructor in CPropertyPage

[Vaclav]

Here is a declaration of property class
class CMyPropertyPage11 : public CPropertyPage

Here is the definition
CMyPropertyPage11::CMyPropertyPage11() : CPropertyPage(CMyPropertyPage11::IDD)

I really do not understand the role of the
CPropertyPage(CMyPropertyPage11::IDD)

But I need to derive CMyPropertyPage11 from another CPropertyPage, say CBasePropertyPage adn really need to know how to implement the CPropertyPage(CMyPropertyPage11::IDD) initialization again.

[weaknessforcats]

class CMyPropertyPage11 : public CPropertyPage 

This says class CMyPropertyPage11 is a derived class of CPropertyPage

  CMyPropertyPage11::CMyPropertyPage11() : CPropertyPage(CMyPropertyPage11::IDD)
 

This says the default constructor of CMyPropertyPage11() calls the base class constructor of CPropertyPage using CMyPropertyPage11::IDD as an argument.

The initializer list (:) of CMyPropertyPage11() guarantees that CPropertyPage::CPropertyPage(CMyPropertyPage11::ID D) is called before the CMyPropertyPage11() constructor executes.

It is important that all base class data members are initialized before attempting to initialize derived class members in the event the derived class requires information from the base class in order to proceed.

Were this not done, when you create a CMyPropertyPage11 object, the CPropertyPage::CPropertyPage() constructor would be called instead. The base portion of your CMyPropertyPage11 object would now be missing the CMyPropertyPage11::IDD.

[Vaclav]

Thank you, I think I got it. At least the basics.
Now I am still stuck with the next step.
I need to have all of the the ProperyPagexx have an access to one common instance of a class.
So I build another BaseProperyPage to instantiate such common class.
Now I need to have the original ProperyPageXX inherit from the BaseProperyPage which inherits from ProperyPage.

To do this multiple inheritance the compiler complains that they both inherit from same base and I need to fix than using virtual inheritance. I think I can handle that.
But I am still unclear how am I going to do the original initialization.

Basically I have no clue how to make this “idea” work so it compiles, because my syntax is wrong:
I have deleted all the : so it is little clearer.

CmyPropertyPage11::CMyPropertyPage11 : (?)

CPropertyPage(CMyPropertyPage11::IDD) (?) original initialization

CBasePropertyPage (?) do I really need this

Here is partial, still not working, declaration:

class CMyPropertyPage11 : public CPropertyPage, virtual public CBasePropertyPage


I am getting tons of errors no matter what I try.
Maybe I should just put the original initialization inside the constructor?
I got he whole “property sheet” from VC 6.0 components and obviously need to know some basic before I get to use it for real.

[weaknessforcats]

You are after a thing called a Singleton. An object for which there is one instance and accessible through a common point.

There is a design pattern called Singleton that does this.

Please read: http://bytes.com/topic/c/insights/65...erns-singleton