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Expose objective indices to .NET API

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This commit is contained in:
Anh-Dung Phan 2013-12-05 17:30:40 -08:00
parent 5fc429c501
commit d38e2b9b78
5 changed files with 90 additions and 44 deletions
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82
src/api/dotnet/Optimize.cs
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@ -18,6 +18,7 @@ Notes:
--*/
using System;
using System.Collections.Generic;
using System.Diagnostics.Contracts;
namespace Microsoft.Z3
@ -28,6 +29,7 @@ namespace Microsoft.Z3
[ContractVerification(true)]
public class Optimize : Z3Object
{
HashSet<uint> indices;
#if false
/// <summary>
@ -64,6 +66,26 @@ namespace Microsoft.Z3
get { return new ParamDescrs(Context, Native.Z3_optimize_get_param_descrs(Context.nCtx, NativeObject)); }
}
/// <summary>
/// Get the number of objectives.
/// </summary>
public uint ObjectiveCount
{
get { return (uint)indices.Count; }
}
/// <summary>
/// Get all indices of objectives.
/// </summary>
public uint[] Objectives
{
get
{
var objectives = new uint[indices.Count];
indices.CopyTo(objectives, 0);
return objectives;
}
}
/// <summary>
/// Assert a constraint (or multiple) into the optimize solver.
@ -91,21 +113,28 @@ namespace Microsoft.Z3
/// <summary>
/// Assert soft constraint
/// </summary>
public void AssertSoft(BoolExpr constraint, uint weight, string group)
/// <remarks>
/// Return an objective which associates with the group of constraints.
/// </remarks>
public uint AssertSoft(BoolExpr constraint, uint weight, string group)
{
Context.CheckContextMatch(constraint);
Symbol s = Context.MkSymbol(group);
Native.Z3_optimize_assert_soft(Context.nCtx, NativeObject, constraint.NativeObject, weight.ToString(), s.NativeObject);
Symbol s = Context.MkSymbol(group);
uint index = Native.Z3_optimize_assert_soft(Context.nCtx, NativeObject, constraint.NativeObject, weight.ToString(), s.NativeObject);
indices.Add(index);
return index;
}
public Status Check() {
Z3_lbool r = (Z3_lbool)Native.Z3_optimize_check(Context.nCtx, NativeObject);
public Status Check() {
Z3_lbool r = (Z3_lbool)Native.Z3_optimize_check(Context.nCtx, NativeObject);
switch (r)
{
case Z3_lbool.Z3_L_TRUE: return Status.SATISFIABLE;
case Z3_lbool.Z3_L_FALSE: return Status.UNSATISFIABLE;
default: return Status.UNKNOWN;
case Z3_lbool.Z3_L_TRUE:
return Status.SATISFIABLE;
case Z3_lbool.Z3_L_FALSE:
return Status.UNSATISFIABLE;
default:
return Status.UNKNOWN;
}
}
@ -127,22 +156,31 @@ namespace Microsoft.Z3
return new Model(Context, x);
}
}
public uint MkMaximize(ArithExpr e)
{
uint index = Native.Z3_optimize_maximize(Context.nCtx, NativeObject, e.NativeObject);
indices.Add(index);
return index;
}
public void Maximize(ArithExpr e) {
Native.Z3_optimize_maximize(Context.nCtx, NativeObject, e.NativeObject);
}
public uint MkMinimize(ArithExpr e)
{
uint index = Native.Z3_optimize_minimize(Context.nCtx, NativeObject, e.NativeObject);
indices.Add(index);
return index;
}
public void Minimize(ArithExpr e) {
Native.Z3_optimize_minimize(Context.nCtx, NativeObject, e.NativeObject);
}
public ArithExpr GetLower(uint index) {
return new ArithExpr(Context, Native.Z3_optimize_get_lower(Context.nCtx, NativeObject, index));
public ArithExpr GetLower(uint index)
{
Contract.Requires(indices.Contains(index));
return new ArithExpr(Context, Native.Z3_optimize_get_lower(Context.nCtx, NativeObject, index));
}
public ArithExpr GetUpper(uint index) {
return new ArithExpr(Context, Native.Z3_optimize_get_upper(Context.nCtx, NativeObject, index));
public ArithExpr GetUpper(uint index)
{
Contract.Requires(indices.Contains(index));
return new ArithExpr(Context, Native.Z3_optimize_get_upper(Context.nCtx, NativeObject, index));
}
#region Internal
@ -150,11 +188,13 @@ namespace Microsoft.Z3
: base(ctx, obj)
{
Contract.Requires(ctx != null);
indices = new HashSet<uint>();
}
internal Optimize(Context ctx)
: base(ctx, Native.Z3_mk_optimize(ctx.nCtx))
{
Contract.Requires(ctx != null);
indices = new HashSet<uint>();
}
internal class DecRefQueue : IDecRefQueue