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POBetter way to structure/new keyword
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  1. POBetter way to structure/new keyword
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    copied!<p>Some time ago I came across the following construct which I have rarely seen since, though I use it relatively frequently. I use it typically when checking on a whole list of conditions are true and it prevents large levels of indentation. Essentially it uses a for loop to provide a kind of structured goto. My question is firstly whether there is better way to structure this, secondly whether people like it and thirdly whether a new keyword in java/c++ etc. such as unit { } which would only cause breaks to exit to the end of the unit would be useful and clearer. </p> <p>ps I realise that it is on slip away from an infinite loop, but I think my paranoia about that has meant its never happened.</p> <p>Edit: I have added some setup code for the further conditions to try to illuminate problems with chained if then elses</p> <pre><code>boolean valid = false; // this loop never loops for (;;) { if (!condition1) break; condition2.setup(); if (!condition2) break; condition3.setup(); if (!condition3) break; valid = true; break; } if (valid) dosomething(); </code></pre> <p>EDIT:</p> <p>I have just discovered that in fact there is a way to structure this in java without misusing loops etc. and wondered whether this would similarily be frowned on, though I guess I have missed the boat on this one.</p> <p>The restructured code looks like this.</p> <pre><code>boolean valid = false; breakout: { if (!condition1) break breakout; condition2.setup(); if (!condition2) break breakout; condition3.setup(); if (!condition3) break breakout; valid = true; } if (valid) dosomething(); </code></pre> <p>Now that removes the misuse of the for loop which caused a lot of the complaints, and is actually a solution I think is quite neat and is what I was looking to find originally. I am guessing that this structure is probably not well known since no one mentioned it, people object to this as strongly?</p>
 

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