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Inside Distributed COM Comments and Corrections

Article ID: 189199

Article Last Modified on 1/8/2000

APPLIES TO

This article was previously published under Q189199

SUMMARY

This article contains comments, corrections, and information about known errors relating to the Microsoft Press book Inside Distributed COM, ISBN 1-57231-849-X.

The following topics are covered:
  • Page 52: Reflexive and Symmetric Used Incorrectly

MORE INFORMATION

Page 52: Reflexive and Symmetric Used Incorrectly

The terms "Reflexive" and "Symmetric" are used incorrectly to describe QueryInterface rules. The correct meaning of these terms is as follows:

Reflexive: (A=A)
Symmetric: (if A=B, then B=A)

To correct the book, the terms should be swapped. Specifically, page 52 should be changed in the following ways:

QueryInterface must be reflexive. If a client holds a pointer to an interface and queries for that same interface, the call must succeed. QueryInterface must be symmetric. If a client holding a pointer to one interface queries successfully for a second interface, the client must be able to call QueryInterface through the second pointer for the first interface.

Swap Reflexive and Symmetric labels on Figure 2-4. Microsoft Press is committed to providing informative and accurate books. All comments and corrections listed above are ready for inclusion in future printings of this book. If you have a later printing of this book, it may already contain most or all of the above corrections.

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