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    <p>Generally, looks good, but for 100% portability, replace that 8 with CHAR_BIT (or numeric_limits::max()) since it isn't guaranteed that characters are 8-bit.</p> <p>Any good compiler will be smart enough to merge all of the math constants at compile time.</p> <p>You can force it to be signed by using a type traits library. which would usually look something like (assuming your numeric_traits library is called numeric_traits):</p> <pre><code>typename numeric_traits&lt;T&gt;::signed_type x; </code></pre> <p>An example of a manually rolled numeric_traits header could look like this: <a href="http://rafb.net/p/Re7kq478.html" rel="noreferrer">http://rafb.net/p/Re7kq478.html</a> (there is plenty of room for additions, but you get the idea).</p> <p>or better yet, use boost:</p> <pre><code>typename boost::make_signed&lt;T&gt;::type x; </code></pre> <p>EDIT: IIRC, signed right shifts don't <strong>have to be</strong> arithmetic. It is common, and certainly the case with every compiler I've used. But I believe that the standard leaves it up the compiler whether right shifts are arithmetic or not on signed type. In my copy of the draft standard the following is written:</p> <blockquote> <p>The value of E1 >> E2 is E1 rightshifted E2 bit positions. If E1 has an unsigned type or if E1 has a signed type and a nonnegative value, the value of the result is the integral part of the quotient of E1 divided by the quantity 2 raised to the power E2. <strong>If E1 has a signed type and a negative value, the resulting value is implementation defined</strong>.</p> </blockquote> <p>But like I said, it will work on every compiler I've seen :-p.</p>
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    1. COMy mind shudders to imagine what might lay in the heart of the compiler implementor who chooses not to preserve sign.
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    2. CO+1 for mentioning CHAR_BIT and the implementation-definedness of signed right shifts (both news to me), but note that automatic template type deduction cannot deduce T for a type such as "numeric_traits<T>::signed_type" -- you'll need to use enable_if for this instead. (As mentioned by grepsedawk.)
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    3. CO@j_random_hacker: I don't see why it wouldn't work if you did: int x = imax<int>(5, 4); no need for enable_if
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