'offsetof' on non-standard-layout type cause crash

[chenbinhi]

When i use BNM_CustomField to add new Field, this is a compiler error:
'offsetof' on non-standard-layout type 'GameLogic::_BNMCustomClassType' (aka 'GameLogic')

and this also crash the game with "null pointer dereference".

is any offsetof replacement in this case?

Thanks

[chenbinhi]

BNM_CustomField only used to add a new class?