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Add missing solver APIs to Java and C# bindings (#8464)

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* Initial plan

* Add missing solver APIs for Java and C#

- Issue 3: Add getTrailLevels() to Java and TrailLevels property to C#
- Issue 4: Add cube() iterator to Java (C# already had Cube())
- Issue 5: Add setInitialValue() to Java and SetInitialValue() to C#

Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>

* Fix code review feedback: eliminate redundant trail retrieval

Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>

* Improve documentation and efficiency based on code review

Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>
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Copilot 2026-02-02 09:01:01 -08:00 • committed by GitHub
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32
src/api/dotnet/Solver.cs
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@ -553,6 +553,38 @@ namespace Microsoft.Z3
}
}
/// <summary>
/// Retrieve the trail and their associated decision levels after a <c>Check</c> call.
/// The trail contains Boolean literals (decisions and propagations), and the levels
/// array contains the corresponding decision levels at which each literal was assigned.
/// </summary>
public uint[] TrailLevels
{
get
{
using ASTVector trail = new ASTVector(Context, Native.Z3_solver_get_trail(Context.nCtx, NativeObject));
uint[] levels = new uint[trail.Size];
Native.Z3_solver_get_levels(Context.nCtx, NativeObject, trail.NativeObject, (uint)trail.Size, levels);
return levels;
}
}
/// <summary>
/// Set an initial value for a variable to guide the solver's search heuristics.
/// This can improve performance when good initial values are known for the problem domain.
/// </summary>
/// <param name="var">The variable to set an initial value for</param>
/// <param name="value">The initial value for the variable</param>
public void SetInitialValue(Expr var, Expr value)
{
Debug.Assert(var != null);
Debug.Assert(value != null);
Context.CheckContextMatch(var);
Context.CheckContextMatch(value);
Native.Z3_solver_set_initial_value(Context.nCtx, NativeObject, var.NativeObject, value.NativeObject);
}
/// <summary>
/// Create a clone of the current solver with respect to <c>ctx</c>.
/// </summary>