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
I_INTERVAL $NFE{_} $NUMBER{_} INT
$REAL_NUMBER{_} FLTD FLT $CPX_NUMBER{_,_}
CPX CPXD CPX{_} $F_NUMBER{_}
F_INTEGER F_REAL F_COMPLEX F_DOUBLE_COMPLEX
F_DOUBLE



Public


Features
nil:SAME;

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