Re: [Boost-users] [mpl] compile time integer power

On 1/22/07, Sami <randomaccessiterator@gmail.com> wrote:

Hi All,

This is a newbie mpl question, and here goes:

How can evaluate integer powers using mpl? Such as,

template < unsigned Pow, class Real > Real pow( Real r ) { return <compile time r*r*r* ... r > ; // the expression is compile time, // not the result of course.

if (Pow == 0) return 1; // to do argue about the value of '0 to the 0'. if (Pow == 1) return r; return pow<Pow - 1>(r) * r; }

Now, why do you want it - I doubt that it will buy you anything in terms of performance. Tony