IFC Export

[salman_abeed]

Does ACAD IFC Export API allows custom applications to override the default implementation for the IFC export process?

So lets say in a dwg file if I have custom objects as well as AutoCAD objects .... is it possible that I write code to convert custom objects and rest will get handled by the default process ?

[norman.yuan]

@salman_abeed , when you say Autodesk IFC API, are you saying there is IFC API coming with AutoCAD verticals (C3D, AutoCAD Architecture/MEP/Mechanical..., so it is free to use if one has the AutoCAD vertical installed), or it is from separated paid licensing, such as RealDwg, by Tech Soft 3D or somewhere else? 

For example, one can use APIs in AcdbMgd.dll in AutoCAD plugin without having to license RealDwg. Can we do the similar with Autodesk IFC API?

Edit:

Sorry, my question was meant for @flinandy59 

[salman_abeed]

Actually I am writing IFC export for a custom product but user can draw simple AutoCAD objects in the dwg file as well. Right now I am picking only the custom objects and generating IFC file using Xbim. But there are simple autocad objects like lines or solids are there. So I want a complete picture.  Is there any sample code available?