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Chapter 6. Interface Maps
*************************

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`Chapter 4 <ch04.html#ch04>`__, "Objects in ATL," discussed how ATL
implements ``IUnknown``, but it covered only ``AddRef`` and ``Release`` completely. This chapter takes a look first at
the requirements that COM makes on an object's implementation of ``QueryInterface`` and then at how ATL supports those
requirements while still providing flexibility and
extensibility.


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