Configurable pointer type; std::from_chars(); aggregate inverses in vector; skip parse_context

src/ifcparse/express.cpp

@@ -9,19 +9,27 @@ uint32_t express::Base::identity() const { return data()->identity(); }
 uint32_t express::Base::id() const { return data()->id(); }
 
 const instance_data* express::Base::data() const {
+#ifdef IFOPSH_SAFE_INSTANCE
     auto sp = data_.lock();
     if (sp) {
         return sp.get();
     } else {
         throw std::runtime_error("Trying to access deleted instance reference");
     }
+#else
+    return data_;
+#endif
 }
 
 instance_data* express::Base::data() { 
+#ifdef IFOPSH_SAFE_INSTANCE
     auto sp = data_.lock();
     if (sp) {
         return sp.get();
     } else {
         throw std::runtime_error("Trying to access deleted instance reference");
     }
+#else
+    return data_;
+#endif
 }