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Author:paulb

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Date:2009-06-17T23:13:47.000000Z


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2009-06-17 23:13:47 +00:00
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documentation/current/method/void-safe-programming-eiffel/void-safety-background-definition-and-tools.wiki
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@@ -70,7 +70,7 @@ We know that in the context of certain code patterns, it is clear that it would
Here a check is made to ensure <code>x</code> is not void. Then as long as no assignments to <code>x</code> are made in the interim, a feature <code>f</code> can be applied to <code>x</code> with the certainty that <code>x</code> will be attached at the time ... and importantly, this can be determined at compile time. So, we say that this code pattern is a CAP for <code>x</code>.
It is important to understand that in this example (and with other CAPs), <code>x</code> is allowed to be a local variable or formal argument only. That is, <code>x</code> may not be an attribute or general expression. Direct access to class attribute references cannot allowed via a CAP due to the fact that they could be set to void by a routine call in some execution path invoked by the intervening instructions or possibly even different process thread. In a later [[Void-safety: Background, definition, and tools#Types as "attached" or "detachable"|section]], we well see that this is not quite such a limitations as it may appear at this point.
It is important to understand that in this example (and with other CAPs), <code>x</code> is allowed to be a local variable or formal argument only. That is, <code>x</code> may not be an attribute or general expression. Direct access to class attribute references cannot be allowed via a CAP due to the fact that they could be set to void by a routine call in some execution path invoked by the intervening instructions or possibly even different process thread. In a later [[Void-safety: Background, definition, and tools#Types as "attached" or "detachable"|section]], we well see that this is not quite such a limitations as it may appear at this point.
{{note|You will find a more detailed discussion of CAPs in [[Void-safe programming in Eiffel#More about CAPs|More about CAPs]]. The current list of CAPs appears in the [[Catalog of Certified Attachment Patterns]]. }}