Function calc_hash

src/ifcgeom/taxonomy.h:327–330

				virtual kinds kind() const { return MATRIX4; }

				virtual size_t calc_hash() const {
					auto v = std::make_tuple(static_cast<size_t>(MATRIX4), hash_components());
					return boost::hash<decltype(v)>{}(v);
				}

				void pre_multiply_scale(double s) {
					components().block<3, 4>(0, 0) *= s;