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This commit is contained in:
Florian Steurer 2016-04-12 11:36:43 +02:00
parent 8b6a4d1746
commit f8d7a95731
1 changed files with 29 additions and 9 deletions
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38
src/de/dhbwstuttgart/typeinference/unify/model/PairOperator.java
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@ -1,22 +1,42 @@
package de.dhbwstuttgart.typeinference.unify.model;
/**
* Operators of pairs of the unification.
* @author Florian Steurer
*/
public enum PairOperator {
/**
* The smaller operator (T < P) is used to express a subtyping relation between
* T and P for example in the finite closure. It is necessarily true.
*/
SMALLER,
/**
* The smallerdot operator (T <. P) is used to express a subtyping relation between
* of T and P in a CONSTRAINT during the unification. It is not necessarily true.
*/
SMALLERDOT,
/**
* The smallerdot operator for arguments (T <.? P) is used to express that
* T is an element of smArg(P) (or P is an element of grArg(T)) in a CONSTRAINT
* during the unification. It is not necessarily true.
*/
SMALLERDOTWC,
/**
* The equalsdot operator (T =. P) is used to express that two types during the unification
* should be equal. It is not necessarily true.
*/
EQUALSDOT;
@Override
public String toString() {
switch (this) {
case SMALLER:
return "<";
case SMALLERDOT:
return "<.";
case SMALLERDOTWC:
return "<.?";
default:
return "=.";
case SMALLER: return "<";
case SMALLERDOT: return "<.";
case SMALLERDOTWC: return "<.?";
default: return "=."; // EQUALSDOT
}
};
}
}