| class DIEDGE{NTP} < $EDGE{NTP}, $HASH |
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| **** | Directed edge |
| $HASH | $IS_EQ | $EDGE{_} | $STR | COMPARE{_} |
| attr first, second: NTP; |
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| attr first, second: NTP; |
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| create(f,s: NTP): SAME |
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| elt_str(e: NTP): STR |
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| hash:INT |
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| **** | A simple hash value computed from the hash values of the components. For this to work, these must either be value types which define hash values or reference types. |
| is_eq(e:DIEDGE{NTP}): BOOL |
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| is_reflexive: BOOL |
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| reverse: DIEDGE{NTP} |
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| str: STR |
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| attr first, second: NTP; |
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| attr first, second: NTP; |
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