Matthias Schabel wrote:

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What do you think about proposing to add mpl::unary_plus, mpl::unary_minus, mpl::pow, and mpl::root to the MPL arithmetic operations?

mpl::negate already exists. There is no point to unary plus. pow and root would be good.

Actually, there's nothing preventing someone from defining a unary + operator that doesn't return the same type as the type it operates on, to the best of my knowledge, so it is potentially important to consider that possibility : struct blah { }; struct blahblah { }; blahblah operator+(const blah&) { return blahblah(); } From a notational standpoint, it would be nice to have unary_plus and unary_minus, although unary_minus would just delegate to negate. Matthias