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    <p>I generally don't use a prefix for member variables.</p> <p>I used to use a <code>m</code> prefix, until someone pointed out that "C++ already has a standard prefix for member access: <code>this-&gt;</code>.</p> <p>So that's what I use now. That is, <em>when there is ambiguity</em>, I add the <code>this-&gt;</code> prefix, but usually, no ambiguity exists, and I can just refer directly to the variable name.</p> <p>To me, that's the best of both worlds. I have a prefix I can use when I need it, and I'm free to leave it out whenever possible.</p> <p>Of course, the obvious counter to this is "yes, but then you can't see at a glance whether a variable is a class member or not".</p> <p>To which I say "so what? If you need to know that, your class probably has too much state. Or the function is too big and complicated".</p> <p>In practice, I've found that this works extremely well. As an added bonus it allows me to promote a local variable to a class member (or the other way around) easily, without having to rename it.</p> <p>And best of all, it is consistent! I don't have to do anything special or remember any conventions to maintain consistency. </p> <hr> <p>By the way, you <em>shouldn't</em> use leading underscores for your class members. You get uncomfortably close to names that are reserved by the implementation.</p> <p>The standard reserves all names starting with double underscore or underscore followed by capital letter. It also reserves all names starting with a single underscore <em>in the global namespace</em>.</p> <p>So a class member with a leading underscore followed by a lower-case letter is legal, but sooner or late you're going to do the same to an identifier starting with upper-case, or otherwise break one of the above rules.</p> <p>So it's easier to just avoid leading underscores. Use a postfix underscore, or a <code>m_</code> or just <code>m</code> prefix if you want to encode scope in the variable name.</p>
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    1. CO"So a class member with a leading underscore followed by a lower-case letter is legal, but sooner or late you're going to do the same to an identifier starting with upper-case, or otherwise break one of the above rules." -- class member variables aren't in the global namespace, so a leading underscore is safe, regardless of whether it's followed by a lower or uppercase letter.
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    2. CO@mbarnett: No, underscore followed by upper-case is reserved *in general*, not just in the global namespace.
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