More schema macro rewriting

src/ifcgeom_schema_agnostic/Kernel.h

@@ -5,33 +5,28 @@
 #include "../ifcgeom_schema_agnostic/IfcGeomIteratorSettings.h"
 #include "../ifcgeom_schema_agnostic/IfcRepresentationShapeItem.h"
 
-#ifdef HAS_SCHEMA_2x3
-#include "../ifcparse/Ifc2x3.h"
-#endif
-#ifdef HAS_SCHEMA_4
-#include "../ifcparse/Ifc4.h"
-#endif
-#ifdef HAS_SCHEMA_4x1
-#include "../ifcparse/Ifc4x1.h"
-#endif
-#ifdef HAS_SCHEMA_4x2
-#include "../ifcparse/Ifc4x2.h"
-#endif
-#ifdef HAS_SCHEMA_4x3_rc1
-#include "../ifcparse/Ifc4x3_rc1.h"
-#endif
-#ifdef HAS_SCHEMA_4x3_rc2
-#include "../ifcparse/Ifc4x3_rc2.h"
-#endif
-#ifdef HAS_SCHEMA_4x3_rc3
-#include "../ifcparse/Ifc4x3_rc3.h"
-#endif
-#ifdef HAS_SCHEMA_4x3_rc4
-#include "../ifcparse/Ifc4x3_rc4.h"
-#endif
-#ifdef HAS_SCHEMA_4x3
-#include "../ifcparse/Ifc4x3.h"
-#endif
+#include <boost/preprocessor/stringize.hpp>
+#include <boost/preprocessor/seq/size.hpp>
+#include <boost/preprocessor/comparison/greater.hpp> 
+
+// @tfk A macro cannot define an include (I think), so here we can't
+// loop over the sequence of schema identifiers, but rather we have
+// unroll the loop with at least the amount of schemas we'd like support
+// for and then overflow into an existing empty include file.
+
+#define INCLUDE_SCHEMA(n) \
+	BOOST_PP_IIF(BOOST_PP_GREATER(BOOST_PP_SEQ_SIZE(SCHEMA_SEQ), n), BOOST_PP_STRINGIZE(BOOST_PP_CAT(BOOST_PP_CAT(../ifcparse/Ifc,BOOST_PP_SEQ_ELEM(n,SCHEMA_SEQ)),.h)), "empty.h")
+
+#include INCLUDE_SCHEMA(0)
+#include INCLUDE_SCHEMA(1)
+#include INCLUDE_SCHEMA(2)
+#include INCLUDE_SCHEMA(3)
+#include INCLUDE_SCHEMA(4)
+#include INCLUDE_SCHEMA(5)
+#include INCLUDE_SCHEMA(6)
+#include INCLUDE_SCHEMA(7)
+#include INCLUDE_SCHEMA(8)
+#include INCLUDE_SCHEMA(9)
 
 #include <boost/function.hpp>
 

src/ifcgeom_schema_agnostic/empty.h

@@ -0,0 +1,2 @@
+// A purposely empty file so that the unrolled loop
+// can overflow into an existing empty include file.