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Java API for getting the objective value as a triple

See #911 for the motivation,
and e02160c674 for the relevant change
in C API.
This commit is contained in:
George Karpenkov 2017-02-27 18:42:44 +01:00
parent 899843b7cd
commit d6c79facc7

View file

@ -101,7 +101,30 @@ public class Optimize extends Z3Object
{
return opt.GetUpper(handle);
}
/**
* @return a triple representing the upper bound of the objective handle.
*
* The triple contains values {@code inf, value, eps},
* where the objective value is unbounded iff {@code inf} is non-zero,
* and otherwise is represented by the expression {@code value + eps * EPSILON},
* where {@code EPSILON} is an arbitrarily small real number.
*/
public ArithExpr[] getUpperAsVector()
{
return opt.GetUpperAsVector(handle);
}
/**
* @return a triple representing the upper bound of the objective handle.
*
* <p>See {@link #getUpperAsVector()} for triple semantics.
*/
public ArithExpr[] getLowerAsVector()
{
return opt.GetLowerAsVector(handle);
}
/**
* Retrieve the value of an objective.
**/
@ -227,6 +250,42 @@ public class Optimize extends Z3Object
return (ArithExpr)Expr.create(getContext(), Native.optimizeGetUpper(getContext().nCtx(), getNativeObject(), index));
}
/**
* @return Triple representing the upper bound for the objective handle.
*
* <p>See {@link Handle#getUpperAsVector}.
*/
private ArithExpr[] GetUpperAsVector(int index) {
return unpackObjectiveValueVector(
Native.optimizeGetUpperAsVector(
getContext().nCtx(), getNativeObject(), index
)
);
}
/**
* @return Triple representing the upper bound for the objective handle.
*
* <p>See {@link Handle#getLowerAsVector}.
*/
private ArithExpr[] GetLowerAsVector(int index) {
return unpackObjectiveValueVector(
Native.optimizeGetLowerAsVector(
getContext().nCtx(), getNativeObject(), index
)
);
}
private ArithExpr[] unpackObjectiveValueVector(long nativeVec) {
ASTVector vec = new ASTVector(
getContext(), nativeVec
);
return new ArithExpr[] {
(ArithExpr) vec.get(0), (ArithExpr) vec.get(1), (ArithExpr) vec.get(2)
};
}
/**
* Return a string the describes why the last to check returned unknown
**/