ifcos-core-runtime

IfcOpenShell runtime crashes after remove() occur because Python wrappers still hold dangling references to deleted C++ objects. Nullifying entity references immediately after deallocation and keeping the parent ifcopenshell.file alive prevents these segfaults.

Compare IfcOpenShell entity wrappers using equality operators like == or .id() rather than Python's identity operator is. Using is on Python wrappers over C++ objects causes logic errors because distinct wrapper instances can represent the same underlying entity.

Query large IFC models safely by indexing with by_type() and avoiding expensive get_info(recursive=True) calls. Using schema-aware PascalCase attribute access further reduces schema version issues and prevents unnecessary graph materialization.

IfcOpenShell supports thread-safe parallelization only by using separate file instances for each thread. Enforcing single-thread write rules is required because concurrent read and write operations on the same ifcopenshell.file instance will cause invalid IFC behavior.

Fix invalid IFC behavior by ensuring the parent ifcopenshell.file stays alive, nullifying entity references after removal, and following schema-aware PascalCase attribute access to maintain correct entity identity throughout the lifecycle.