Re: how to avoid pulling in Win32 include "world" for mutex

"Alf P. Steinbach" <>
Sun, 6 May 2007 15:54:55 CST
* Alf P. Steinbach:

The PIMPL idiom only requires a forward declaration of your own
implementation class, not of classes used in the implementation.

I meant, the usual PIMPL idiom,

   class Mutex
       class Impl;
       Impl* pImpl;

The corresponding compiler firewall idiom of a providing a factory
function for an abstract class,

  class AbstractMutex
      virtual ~AbstractMutex() {}

  std::auto_ptr<AbstractMutex> mutex();

does not even require a forward declaration of the implementation class,
but at the cost of preventing the client code from defining derived
classes with the desired functionality. It appears that some use the
term "PIMPL" also for this.

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