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Added a reference for reader to get more information about the Bridge Pattern.

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Author:vwheeler
Date:2014-04-28T23:51:13.000000Z


git-svn-id: https://svn.eiffel.com/eiffel-org/trunk@1334 abb3cda0-5349-4a8f-a601-0c33ac3a8c38
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vwheeler
2014-04-28 23:51:13 +00:00
parent 0f80dd87e9
commit 94270febcf
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documentation/current/solutions/gui-building/eiffelvision-2/eiffelvision-introduction.wiki
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@@ -81,6 +81,6 @@ Boolean properties have a different convention. Instead of one set-routine, it h
For flexibility, EiffelVision 2 is built using the bridge pattern. This means that every platform-dependent component of the library consist of two classes, plus an implementation class for each platform (currently two). One is the <eiffel>interface</eiffel>. All the features of interfaces do nothing except delegate the call to the implementation object which is coupled to it. This object has the static type of the implementation-interface with the name of the interface class, with an "<eiffel>_I</eiffel>" suffix. The implementation classes (with an "<eiffel>_IMP</eiffel>" suffix) then inherit from this implementation-interface class to implement platform-specific features. At run time, these platform-specific implementation objects (instantiated from the "<eiffel>_IMP</eiffel>" classes) are then polymorphically attached to the to the "<eiffel>_I</eiffel>"-typed attributes (typically named "implementation") to provide the platform-specific services.
{{SeeAlso| The book titled ''Design Patterns: Elements of Reusable Object-Oriented Software'' by Erich Gamma, Richard Helm, Ralph Johnson, and John Vlissides, contains a complete description of the Bridge Pattern.}}