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Date:2008-09-17T13:53:28.000000Z


git-svn-id: https://svn.eiffel.com/eiffel-org/trunk@3 abb3cda0-5349-4a8f-a601-0c33ac3a8c38
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2008-09-17 13:53:28 +00:00
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documentation/current/eiffelstudio/eiffelstudio-reference/debugger/object-tool/debug-output.wiki Normal file
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[[Property:title|Debug output]]
[[Property:weight|2]]
In both grids of the [[Objects tool: Introduction|object tool]] , objects are displayed. For virtually all objects, it is possible to display a user-definable string value next to the object address.
To do so, inherit from the class <eiffel>DEBUG_OUTPUT</eiffel> in the classes that should let their objects display a string value, and implement the `debug_output' feature. At run-time, the debugger will automatically query the result of this feature on all objects that define it and display it in the object tool and the [[Expression evaluation|evaluation tool]] .
{{sample| '''Sample''': The <eiffel>NUMERIC</eiffel> class inherits from the <eiffel>DEBUG_OUTPUT</eiffel> one so that it is possible to see the value of *_REF objects without expanding them. }}
{{tip| '''Tip''': If an object has a long string output or an output with carriage returns, for instance, pick-and-drop it to the expanded display command [[Image:debugger-expand-info-icon]] in the object tool. }}