First step at reorganizing

src/ifcgeom/taxonomy.h

@@ -0,0 +1,96 @@
+#include <boost/variant.hpp>
+
+namespace ifcopenshell {
+
+namespace geometry {
+
+namespace taxonomy {
+
+struct item {
+    int instance_id;
+    virtual item* clone() const = 0;
+};
+
+struct matrix4 : public item {
+    enum tag_t {
+        IDENTITY, AFFINE_WO_SCALE, AFFINE_W_UNIFORM_SCALE, AFFINE_W_NONUNIFORM_SCALE, OTHER
+    };
+    tag_t tag;
+    std::array<double, 16> components;
+    matrix4() : components({1. ,0., 0., 0., 0., 1., 0., 0., 0., 0., 1. ,0., 0., 0., 0., 1.}), tag(IDENTITY) {}
+
+	virtual item* clone() const { return new matrix4(*this); }
+};
+
+struct geom_item : public item {
+    // geometry::style surface_style;
+    matrix4 matrix;
+};
+
+template <size_t N>
+struct cartesian_base : public item {
+	std::array<double, N> components;
+};
+
+struct point3 : public cartesian_base<3> {
+    virtual item* clone() const { return new point3(*this); }
+};
+
+struct direction3 : public cartesian_base<3> {
+	virtual item* clone() const { return new direction3(*this); }
+};
+
+struct line : public item {
+	virtual item* clone() const { return new line(*this); }
+};
+
+struct circle : public item {
+	virtual item* clone() const { return new circle(*this); }
+};
+
+struct ellipse : public item {
+	virtual item* clone() const { return new ellipse(*this); }
+};
+
+struct bspline : public item {
+	virtual item* clone() const { return new bspline(*this); }
+};
+
+typedef boost::variant<line, circle, ellipse, bspline> curve;
+
+struct edge : public item {
+	boost::variant<point3, double> start, end;
+	boost::optional<curve> basis;
+
+	virtual item* clone() const { return new edge(*this); }
+};
+
+struct boundary : public item {
+	std::vector<edge> edges;
+
+	virtual item* clone() const { return new boundary(*this); }
+};
+
+struct face : public item {
+	boundary outer;
+	std::vector<boundary> inner;
+
+	virtual item* clone() const { return new face(*this); }
+};
+
+struct sweep : public item {
+    face basis;
+};
+
+struct extrusion : public sweep {
+    direction3 direction;
+    double depth;
+
+	virtual item* clone() const { return new extrusion(*this); }
+};
+
+}
+
+}
+
+}