Need an architecture

[Kohinoor24]

I Have 2 classes "Writerthread" and "readerThread".
I have 2 other classes "WinThread" & "LinuxThread" which are base classes for the Writerthread" and "readerThread".

I want to derive these classes say,

class WriterThreadublic WinThread or
class WriterThreadublic LinuxThread

The problem is I want to do it dynamically.The writerthread should derive from 1 of these classes,depending on the operating system(ie:wheather it is linux or windows).In the main(), Iam using a
#ifdef _LINUX_
#endif
#ifdef _WIN_VER
#endif
I need an architecture so that I can derive from 1 of these classes dynamically.
I dont want to use #ifdef inside the classes

Thanks

[j0nas]

Linux and Windows are two different operating systems... I don't think you can do this check in run-time--don't you need to compile your program for these two OS?

Maybe I just don't get it

[jfaust]

You can dynamically change a class's base class by using a template class and deriving from the template parameter. It would look something like this, although I didn't try to compile it.

template<class T>
class WriterThread : public T
{
};

then in main:

#ifdef _LINUX_
writer = new WriterThread<LinuxThread>();
#else
writer = new WriterThread<WinThread>();
#endif

Jeff

[Elrond]

Why not something like
#ifdef _LINUX_
class WriterThread : public LinuxThread
#endif
#ifdef _WIN_VER
class WriterThread : public WinThread
#endif

If everything is well defined after that, you may be able not to use these defines in the rest of your class.