[boost] [math] pow instantiates a number of template proportional to the exponent

14 May 2008

      AMDG

I just looked at the implementation of pow<N> in 
boost/math/special_function.hpp.
Line 54:
        return (N%2) ? base*positive_power<N-1>::result(base)

in positive_power causes positive_power to be instantiated with all
the integers from N down to 0.  I think that this should use template
specialization instead of ?: to keep the number of instantiations down,
even though this probably won't affect the runtime cost.

In Christ,
Steven Watanabe