Further implement serialization

src/ifcparse/IfcEntityInstanceData.cpp

@@ -333,23 +333,22 @@ bool impl::serialize(std::string& val, const empty_aggregate_t& t)
 {
     val.resize(1);
     val[0] = TypeEncoder::encode_type<empty_aggregate_t>();
-    return false;
+    return true;
 }
 
 bool impl::serialize(std::string& val, const empty_aggregate_of_aggregate_t& t)
 {
     val.resize(1);
     val[0] = TypeEncoder::encode_type<empty_aggregate_of_aggregate_t>();
-    return false;
+    return true;
 }
 
 bool impl::serialize(std::string& val, const boost::logic::tribool& t)
 {
-    using T = char;
+    char tt = t == boost::logic::indeterminate ? 2 : t ? 1 : 0;
-    T tt = t == boost::logic::indeterminate ? 2 : t ? 1 : 0;
+    val.resize(sizeof(char) + 1);
-    val.resize(sizeof(T) + 1);
+    val[0] = TypeEncoder::encode_type<boost::logic::tribool>();
-    val[0] = TypeEncoder::encode_type<T>();
+    memcpy(val.data() + 1, &tt, sizeof(char));
-    memcpy(val.data() + 1, &tt, sizeof(T));
     return true;
 }
 

src/ifcparse/IfcFile.cpp

@@ -421,6 +421,10 @@ namespace {
         tbo.pin_top_level_index_and_filter = true;
         */
 
+		// 28: 256MB
+		// 29: 512MB
+        // 30: 1GB
+
         auto block_cache = rocksdb::NewLRUCache(1ULL << 30);
         tbo.block_cache = block_cache;