Optimize Class Reference

Inheritance diagram for Optimize:

Data Structures
class	Handle

Public Member Functions
String	getHelp ()
void	setParameters (Params value)
ParamDescrs	getParameterDescriptions ()
void	Assert (Expr< BoolSort > ... constraints)
void	Add (Expr< BoolSort > ... constraints)
void	AssertAndTrack (Expr< BoolSort > constraint, Expr< BoolSort > p)
Handle<?>	AssertSoft (Expr< BoolSort > constraint, int weight, String group)
Handle<?>	AssertSoft (Expr< BoolSort > constraint, String weight, String group)
Status	Check (Expr< BoolSort >... assumptions)
void	Push ()
void	Pop ()
Model	getModel ()
BoolExpr[]	getUnsatCore ()
String	getReasonUnknown ()
String	toString ()
void	fromFile (String file)
void	fromString (String s)
BoolExpr[]	getAssertions ()
Expr<?>[]	getObjectives ()
Statistics	getStatistics ()

Additional Inherited Members
Static Public Member Functions inherited from Z3Object
static long[]	arrayToNative (Z3Object[] a)
static int	arrayLength (Z3Object[] a)

Detailed Description

Object for managing optimization context

Definition at line 30 of file Optimize.java.

Member Function Documentation

Add()

void Add ( Expr< BoolSort > ...  constraints )

inline

Alias for Assert.

Definition at line 73 of file Optimize.java.

    {
        Assert(constraints);
    }

Assert()

void Assert ( Expr< BoolSort > ...  constraints )

inline

Assert a constraint (or multiple) into the optimize solver.

Definition at line 61 of file Optimize.java.

    {
        getContext().checkContextMatch(constraints);
        for (Expr<BoolSort> a : constraints)
        {
            Native.optimizeAssert(getContext().nCtx(), getNativeObject(), a.getNativeObject());
        }
    }

AssertAndTrack()

void AssertAndTrack ( Expr< BoolSort >  constraint, Expr< BoolSort >  p  )

inline

Assert a constraint into the optimizer, and track it (in the unsat) core using the Boolean constant p.

Remarks: This API is an alternative to check with assumptions for extracting unsat cores. Both APIs can be used in the same solver. The unsat core will contain a combination of the Boolean variables provided using assertAndTrack and the Boolean literals provided using check with assumptions.

Definition at line 91 of file Optimize.java.

    {
        getContext().checkContextMatch(constraint);
        getContext().checkContextMatch(p);
 
        Native.optimizeAssertAndTrack(getContext().nCtx(), getNativeObject(),
                constraint.getNativeObject(), p.getNativeObject());
    }

AssertSoft() [1/2]

Handle<?> AssertSoft ( Expr< BoolSort >  constraint, int  weight, String  group  )

inline

Assert soft constraint

Return an objective which associates with the group of constraints.

Definition at line 177 of file Optimize.java.

    {
        return AssertSoft(constraint, Integer.toString(weight), group);
    }

AssertSoft() [2/2]

Handle<?> AssertSoft ( Expr< BoolSort >  constraint, String  weight, String  group  )

inline

Assert soft constraint

Return an objective which associates with the group of constraints.

Definition at line 188 of file Optimize.java.

    {
        getContext().checkContextMatch(constraint);
        Symbol s = getContext().mkSymbol(group);
        return new Handle<>(this, Native.optimizeAssertSoft(getContext().nCtx(), getNativeObject(), constraint.getNativeObject(), weight, s.getNativeObject()));
    }

Check()

Status Check ( Expr< BoolSort >...  assumptions )

inline

Check satisfiability of asserted constraints. Produce a model that (when the objectives are bounded and don't use strict inequalities) is optimal.

Definition at line 200 of file Optimize.java.

    {
        Z3_lbool r;
        if (assumptions == null) {
          r = Z3_lbool.fromInt(
              Native.optimizeCheck(
                  getContext().nCtx(), 
                  getNativeObject(), 0, null));
        }
        else {
          r = Z3_lbool.fromInt(
              Native.optimizeCheck(
                  getContext().nCtx(), 
                  getNativeObject(), 
                  assumptions.length, 
                  AST.arrayToNative(assumptions)));
        }
        switch (r) {
            case Z3_L_TRUE:
                return Status.SATISFIABLE;
            case Z3_L_FALSE:
                return Status.UNSATISFIABLE;
            default:
                return Status.UNKNOWN;
        }
    }

fromFile()

void fromFile ( String  file )

inline

Parse an SMT-LIB2 file with optimization objectives and constraints. The parsed constraints and objectives are added to the optimization context.

Definition at line 369 of file Optimize.java.

    {
        Native.optimizeFromFile(getContext().nCtx(), getNativeObject(), file);
    }

fromString()

void fromString ( String  s )

inline

Similar to FromFile. Instead it takes as argument a string.

Definition at line 377 of file Optimize.java.

    {
        Native.optimizeFromString(getContext().nCtx(), getNativeObject(), s);
    }

getAssertions()

BoolExpr [] getAssertions ( )

inline

The set of asserted formulas.

Definition at line 385 of file Optimize.java.

    {
        ASTVector assertions = new ASTVector(getContext(), Native.optimizeGetAssertions(getContext().nCtx(), getNativeObject()));
        return assertions.ToBoolExprArray();
    }

getHelp()

String getHelp ( )

inline

A string that describes all available optimize solver parameters.

Definition at line 35 of file Optimize.java.

    {
        return Native.optimizeGetHelp(getContext().nCtx(), getNativeObject());
    }

getModel()

Model getModel ( )

inline

The model of the last Check.

The result is null if Check was not invoked before, if its results was not SATISFIABLE, or if model production is not enabled.

Definition at line 252 of file Optimize.java.

    {
        long x = Native.optimizeGetModel(getContext().nCtx(), getNativeObject());
        if (x == 0) {
            return null;
        } else {
            return new Model(getContext(), x);
        }
    }

getObjectives()

Expr<?> [] getObjectives ( )

inline

The set of asserted formulas.

Definition at line 394 of file Optimize.java.

    {
        ASTVector objectives = new ASTVector(getContext(), Native.optimizeGetObjectives(getContext().nCtx(), getNativeObject()));
        return objectives.ToExprArray();
    }

getParameterDescriptions()

ParamDescrs getParameterDescriptions ( )

inline

Retrieves parameter descriptions for Optimize solver.

Definition at line 53 of file Optimize.java.

    {
        return new ParamDescrs(getContext(), Native.optimizeGetParamDescrs(getContext().nCtx(), getNativeObject()));
    }

getReasonUnknown()

String getReasonUnknown ( )

inline

Return a string the describes why the last to check returned unknown

Definition at line 351 of file Optimize.java.

    {
        return Native.optimizeGetReasonUnknown(getContext().nCtx(), getNativeObject());
    }

getStatistics()

Statistics getStatistics ( )

inline

Optimize statistics.

Definition at line 403 of file Optimize.java.

    {
        return new Statistics(getContext(), Native.optimizeGetStatistics(getContext().nCtx(), getNativeObject()));
    }

getUnsatCore()

BoolExpr [] getUnsatCore ( )

inline

The unsat core of the last

Check 

. Remarks: The unsat core is a subset of

Assumptions 

The result is empty if

Check 

was not invoked before, if its results was not

UNSATISFIABLE 

, or if core production is disabled.

Exceptions

Z3Exception

Definition at line 271 of file Optimize.java.

    {
        ASTVector core = new ASTVector(getContext(), Native.optimizeGetUnsatCore(getContext().nCtx(), getNativeObject()));        
        return core.ToBoolExprArray();
    }

Pop()

void Pop ( )

inline

Backtrack one backtracking point.

Note that an exception is thrown if Pop is called without a corresponding Push.

Definition at line 240 of file Optimize.java.

    {
        Native.optimizePop(getContext().nCtx(), getNativeObject());
    }

Push()

void Push ( )

inline

Creates a backtracking point.

Definition at line 230 of file Optimize.java.

    {
        Native.optimizePush(getContext().nCtx(), getNativeObject());
    }

setParameters()

void setParameters ( Params  value )

inline

Sets the optimize solver parameters.

Exceptions

Z3Exception

Definition at line 45 of file Optimize.java.

    {
        Native.optimizeSetParams(getContext().nCtx(), getNativeObject(), value.getNativeObject());
    }

toString()

String toString ( )

inline

Print the context to a String (SMT-LIB parseable benchmark).

Definition at line 360 of file Optimize.java.

    {
        return Native.optimizeToString(getContext().nCtx(), getNativeObject());
    }