abstract class $NIL < $IS_NIL
****
Inidicates that the subtype provides a nil value
_
Designer's Note:The advantage of T over SAME is that in parametrized classes typecase e when $NILthen .... e.nil e.nil is now known to be of type T, whereas if it were SAME, you would need at least an extra level of typecase


Ancestors
$IS_NIL

Descendants
$NFE{_} $NUMBER{_} INT $REAL_NUMBER{_}
FLTD FLT $CPX_NUMBER{_,_} CPX
CPX{_} CPXD



Public


Features
nil:SAME;

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