StackOverflow2013

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15164909
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2013-03-01T18:57:56.613
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2013-03-01T19:21:37.177
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2013-03-01T19:21:37.177
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<p>I did not understand the question completely, so i will answer all of the cases that could occur:</p> <ol> <li>If you did not understand how 2 of my <code>CountWords</code> examples differ: First one creates and frees class instance each time it is called. Second one only creates class instance on first call, then uses it till the program terminates.</li> <li>If you mean how would that differ if you created a singleton and implemented <code>CountWords</code> in it: it wouldn't differ in functionality, but you would have to write a whole new class for it, then initialize it on program start and use it later. Besides there's a lot of criticism on using singletons (see wiki for more info), so i wouldn't do that.</li> <li>If you are asking about the actual work these two example functions are performing: they obviously yield same results, but first one isn't optimized for running in environment that calls this function a lot. As i said before, you could reach same results by declaring a global variable, but if you do that - you will see your global variable everywhere in your program, whereas it is only needed in one specific location and nowhere else.</li> </ol> <p>P.S. I was actually wrong about <code>const</code> function parameters, it turns out these things behave differently in different delphi versions. Const parameters acted just the same as <code>var</code> parameters in Delphi 6, but in Delphi XE2 it seems local variable is created anyway. Either way i do not recommend messing with <code>const</code> function parameters.</p>
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