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copied!<p>The real problem here appears to be that you're providing the outside world with (relatively) direct access to the internals of your class. In a few cases (e.g., container classes) that can make sense, but in most it means you're providing low-level access to the internals as dumb data, where you should be looking at the higher-level operations that client code <em>does</em> with that data, and then provide those higher-level operations directly from your class.</p> <p>Edit: While it's true that in this case, there's apparently no class involved, the basic idea remains the same. I don't think it's shirking the issue either -- I'm simply pointing out that while I agree that it <em>is</em> an issue, it's only that arises only rather infrequently.</p> <p>I'm not sure low-level code justifies such things either. Most of my code is much lower level than most people ever have much reason to work with, and I still only encounter it rather infrequently.</p> <p>Edit2: I should also mention that C++ 0x has a new definition of the <code>auto</code> keyword, along with a new keyword (<code>decltype</code>) that make a fair number of things like this considerably easier to handle. I haven't tried to implement this exact function with them, but this general kind of situation is the sort of thing for which they're intended (e.g., automatically figuring out a return type based on passed arguments). That said, they normally do just a bit more than you want, so they might be a bit clumsy (if useful at all) for this exact situation.</p>

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