Struct lsst::afw::image::pixelOp2XY

template<typename LhsT, typename RhsT>
struct pixelOp2XY : public std::function<LhsT(int, int, LhsT, RhsT)>

A functor class equivalent to std::function<LhsT (int, int, LhsT, RhsT)>, but with a virtual operator()