Work towards v1.0 data model with encapsulated weak_ptr as basis for instances

src/ifcparse/express.cpp

@@ -0,0 +1,27 @@
+#include "express.h"
+#include "InstanceData.h"
+
+const IfcParse::declaration& express::Base::declaration() const {
+    return *data()->declaration();
+}
+uint32_t express::Base::identity() const { return data()->identity(); }
+
+uint32_t express::Base::id() const { return data()->id(); }
+
+const InstanceData* express::Base::data() const {
+    auto sp = data_.lock();
+    if (sp) {
+        return sp.get();
+    } else {
+        throw std::runtime_error("Trying to access deleted instance reference");
+    }
+}
+
+InstanceData* express::Base::data() { 
+    auto sp = data_.lock();
+    if (sp) {
+        return sp.get();
+    } else {
+        throw std::runtime_error("Trying to access deleted instance reference");
+    }
+}