sgs_OptStackItem [function]

sgs_Variable sgs_OptStackItem( sgs_Context* C, sgs_StkIdx item )

Returns a non-owned copy of a variable on stack or null if the index is invalid.

• See sgs_StackItem for details on behavior, only difference is that null is returned when an invalid stack index is passed.
• This function is useful for the implementation of "Parse"/"ArgCheck" functions which are required never to throw errors by convention.