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copied!<p>Especially in purely native languages, like Delphi, you should be more than careful not to abuse the freedom to be able to cast anything to anything. IOW: One thing, I have seen is that someone copies the definition of a class (e.g. from the implementation section in RTL or VCL) into his own code and then cast instances of the original class to his copy. Now, after upgrading the library where the original class came from, you might experience all kinds of weird stuff. Like jumping into the wrong methods or bufferoverflows.</p> <p>There's also the habit of using signed integer as pointers and vice-versa. (Instead of cardinal) this works perfectly fine as long as your process has only 2GB of address space. But boot with the /3GB switch and you will see a lot of apps that start acting crazy. Those made the assumption of "pointer=signed integer" at least somewhere. Your customer uses a 64Bit Windows? Chances are, he might have a larger address space for 32Bit apps. Pretty tough to debug w/o having such a test system available.</p> <p>Then, there's race conditions. Like having 2 threads, where one is very, very slow. So that you instinctively assume it will always be the last one and so there's no code that handles the scenario where "Captn slow" finishes first. Changes in the underlying technologies can make these assumptions very wrong, very fast indeed. Take a look at the upcoming breed of Flash-based super-mega-fast server storage. Systems that can read and write Gigabytes per second. Applications that assume the IO stuff to be significantly slower than some calculations on in-memory values will easily fail on this kind of fast storage.</p> <p>I could go on and on, but I gotta run right now... Cheers</p>

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