Compile-time options to manipulate caching behaviour

src/ifcgeom/IfcGeom.h

@@ -46,22 +46,35 @@
 #include "../ifcgeom/IfcRepresentationShapeItem.h"
 #include "../ifcgeom/IfcGeomShapeType.h"
 
+#define NO_CACHE
+
+#ifdef NO_CACHE
+
+#define IN_CACHE(T,E,t,e)
+#define CACHE(T,E,e)
+
+#else
+
 #define IN_CACHE(T,E,t,e) std::map<int,t>::const_iterator it = cache.T.find(E->entity->id());\
 if ( it != cache.T.end() ) { e = it->second; return true; }
 #define CACHE(T,E,e) cache.T[E->entity->id()] = e;
 
+#endif
+
 namespace IfcGeom {
 
 class Cache {
 public:
 #include "IfcRegisterCreateCache.h"
-	std::map<int, SurfaceStyle> Style;
 	std::map<int, TopoDS_Shape> Shape;
 };
 
 class Kernel {
 private:
+#ifndef NO_CACHE
 	Cache cache;
+#endif
+	std::map<int, SurfaceStyle> style_cache;
 public:
 	// Tolerances and settings for various geometrical operations:
 	enum GeomValue {
@@ -182,6 +195,15 @@ public:
 		return std::make_pair<IfcSchema::IfcSurfaceStyle*, T*>(0,0);
 	}
 
+	void purge_cache() { 
+		// Rather hack-ish, but a stopgap solution to keep memory under control
+		// for large files. SurfaceStyles need to be kept at all costs, as they
+		// are read later on when serializing Collada files.
+#ifndef NO_CACHE
+		cache = Cache(); 
+#endif
+	}
+
 #include "IfcRegisterGeomHeader.h"
 
 };