Class TIfcPersistent
Unit
Declaration
type TIfcPersistent = class abstract(TComponent)
Description
Abstract class that can be serialized to / deserialized from an IFC file. This is not part of the official IFC standard, it is added for CGE purposes.
It is a TComponent, because all IFC classes are owned by a common owner. This way we avoid complicated memory management ("who is responsible for freeing who", or reference counting as we did for X3D nodes), and we can easily free all IFC classes by freeing the owner.
Hierarchy
- TObject
- TPersistent
- TComponent
- TIfcPersistent
Overview
Properties
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property GlobalId: String read FGlobalId write FGlobalId; |
Description
Properties
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property GlobalId: String read FGlobalId write FGlobalId; |
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Globally unique identifier for the object instance. Note: Not declared as TGUID, because TGUID cannot be published, but also we don't really need it: for our purposes, this identifier is just an arbitrary string. Note: IFC 4.3 specification puts this only at IfcRoot, not at every IFC class. But testcase https://github.com/buildingsmart-community/Community-Sample-Test-Files/blob/main/IFC%204.0.2.1%20(IFC%204)/ISO%20Spec%20archive/wall-with-opening-and-window.json (from IFC 4.0) shows this can be present at any IFC class. | |
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