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ID: 14787, COM Aggregation example

by Ionel Munoz Email: Anonymous

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For C++Builder, Version 5.0  to 5.0 1599 downloads
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Size: 21,443 bytes
Updated on Thu, 08 Jun 2000 06:14:42 GMT
Originally uploaded on Thu, 08 Jun 2000 06:14:42 GMT
SHA1 Hash: C3A8907557276DB5FC7A43E7CF5796B5178DFF38
MD5 Hash: 92691FE8DC7D95D8018D987D3C503C4D

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This example shows how to use aggregation in COM. An object can take advantage of the implementation of an interface already implemented by another object, simply using COM aggregation. ATL 3 provides a simple way of doing so, and this code shows how to do it in C++Builder 5. This subject is not covered (to the moment) in the "C++Builder 5 Developer's Guide" book, to be published by Sams the next september.

Here, the Outer object implements the IOuter interface, while the Inner object implements the IInner interface. As the Outer object aggregates the Inner one, it also implements the IInner interface.

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