vfoSupportsAbut?

vfoSupportsAbut?(
g_obj
d_instId
) 
=> t / nil

Checks if the Abut operation is supported on the given instance.

g_obj	An instance of SKILL++ class `vfoAbstractClass` or any of its subclasses.
d_instId	The instance ID on which the operation is invoked.

`t`	The `Abut` operation is supported on the given instance.
`nil`	The `Abut` operation is not supported on the given instance.

obj = vfoAllocateProtocolObj(inst)
    => stdobj@0x148f5138
vfoSupportsAbut?(obj inst)
    => t