partial class COMPARE{ETP} |
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**** | Partial class that should be included by containers of elements of type ETP that need to provide an elt_eq and/or an elt_lt routine. |
elt_eq(e1,e2:ETP):BOOL |
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**** | The "less than" relation used in the sorting routines. Compares the object "id" by default. May be redefined in descendants. |
elt_hash(e:ETP):INT |
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**** | A hash value associated with an element. Must have the property that if "elt_eq(e1,e2)" then "elt_hash(e1)=elt_hash(e2)". Can be defined to always return 0, but many routines will then become quadratic. Uses object "id" by default. May be redefined in descendants. |
elt_lt(e1,e2:ETP):BOOL |
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**** | The "less than" relation used in the sorting routines. Compares the object "id" by default. May be redefined in descendants. |
elt_nil: ETP |
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**** | Return the nil value. If the element is under $NIL then return e.nil. Otherwise, return void
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is_elt_nil(e:ETP):BOOL |
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