PROBLEM Unable to understand the variation in size of object All the code is tested under Borland C++ ver 3.1 In borland V3.1 the int takes two bytes Lets look at the following code Class base { public: int b; base() {} virtual void f() {} virtual void g() {} }; Class derive : virtual public base { public: int d; derive() {} virtual void f() {} virtual void g() {} }; ……………… derive d; cout<gives 12 why? /* But if I don’t give constructors in derive then the size of derive class object is 10, because there will be no 2 bytes extra in object layout as shown below. Please help me out about finding the myth of these extra two bytes. */

 Object-Layout            V-TABLE
    |------------|          |------------|
 ---|ptr to base |       -->|derive::f   |	
 |  |------------|       |  |------------|
 |  |derive v-ptr|-------|  |derive::k   | 
 |  |------------|          |------------|
 |  |d           |        ->|derive::f   |
 |  |------------|        | |------------|
 |  |0           |<--     | |base::g     |
 |  |------------|   |    | |------------|
 -->|base-vptr   |---|----|	
    |------------|   |	
    |b           |   |
    |------------|   |**what the hell is this**

Please reply at: Contact: informfarid@yahoo.com ------------------------------------------------------------ In the middle of dificulty lies oppurtunity.

Sir, I am student of Punjab University College of Information Technology, Lahore, Pakistan I have problem while using Borland C++ v3.1. Problem: ========= The size of an object in virtual inheritance increases 2 bytes Class base { public: int b; base() {} virtual void f() {} virtual void g() {} }; Class derive : virtual public base { public: int d; derive() {} virtual void f() {} virtual void g() {} }; ---------------------- derive d; cout<The object layout in figure is in following URL [OBJECT LAYOUT FIGURE](<a href=) */ The object layout where that extra 2 bytes are laid is drawn in atttchment with v-table layout. Please contact me at! informfarid@yahoo.com