Re: [Boost-users] [units] subtract_typeof_helper<> help!

AMDG Terry Golubiewski wrote:

I'm trying to use boost::geometry and boost::units together. For some reason boost::geometry doesn't represent the difference of two points as vectors. So, I'm making my own Vector class and defining Vector = Point - Point. The sample program below doesn't compile because I need to tell the units library about the special properties of point subtraction (I think).

The problem is that your operator- can't be found by ADL.

using namespace boost::geometry;

typedef point Point; <snip>

inline Vector operator-(const Point& lhs, const Point& rhs);

In Christ, Steven Watanabe