/vmb, /vmg (Representation Method)
Select the method that the compiler uses to represent pointers to class members.
Use /vmb if you always define a class before you declare a pointer to a member of the class.
Use /vmg to declare a pointer to a member of a class before defining the class. This need can arise if you define members in two different classes that reference each other. For such mutually referencing classes, one class must be referenced before it is defined.
To set this compiler option in the Visual Studio development environment
Open the project's Property Pages dialog box. For details, see How to: Open Project Property Pages.
Click the C/C++ folder.
Click the Command Line property page.
Type the compiler option in the Additional Options box.
To set this compiler option programmatically