Re: [boost] [math][integer] Moving integer utilities out of the mathlib.

John Maddock wrote:

This does look to me like a good idea, but to remain coherent, all of http://www.boost.org/doc/libs/1_57_0/libs/math/doc/html/gcd_lcm.html should move, which means:

common_factor.hpp common_factor_rt.hpp common_factor_ct.hpp

Plus docs and tests.

One problem I see here is that the compile-time templates derive from mpl::integral_c, which means a dependency on MPL. I doubt that anyone is actually using anything besides ::value, but in principle, the base class can't be removed without potentially breaking code. So, to be on the safe side, boost/math/common_factor_ct.hpp should probably contain using boost::integer::static_gcd_type; template < static_gcd_type Value1, static_gcd_type Value2 > struct boost::math::static_gcd : public mpl::integral_c::value> { }; And, for reasons well outlined in your other post, the boost/math headers should remain in Math.