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https://github.com/Z3Prover/z3
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add push/pop to optimization context for convenience
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
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@ -102,6 +102,23 @@ extern "C" {
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Z3_CATCH_RETURN(0);
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}
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void Z3_API Z3_optimize_push(Z3_context c,Z3_optimize d) {
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Z3_TRY;
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LOG_Z3_optimize_push(c, d);
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RESET_ERROR_CODE();
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to_optimize_ptr(d)->push();
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Z3_CATCH;
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}
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void Z3_API Z3_optimize_pop(Z3_context c,Z3_optimize d) {
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Z3_TRY;
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LOG_Z3_optimize_pop(c, d);
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RESET_ERROR_CODE();
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to_optimize_ptr(d)->pop(1);
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Z3_CATCH;
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}
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Z3_lbool Z3_API Z3_optimize_check(Z3_context c, Z3_optimize o) {
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Z3_TRY;
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LOG_Z3_optimize_check(c, o);
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@ -1511,6 +1511,12 @@ namespace z3 {
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handle minimize(expr const& e) {
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return handle(Z3_optimize_minimize(ctx(), m_opt, e));
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}
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void push() {
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Z3_optimize_push(ctx(), m_opt);
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}
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void pop() {
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Z3_optimize_pop(ctx(), m_opt);
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}
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check_result check() { Z3_lbool r = Z3_optimize_check(ctx(), m_opt); check_error(); return to_check_result(r); }
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model get_model() const { Z3_model m = Z3_optimize_get_model(ctx(), m_opt); check_error(); return model(ctx(), m); }
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void set(params const & p) { Z3_optimize_set_params(ctx(), m_opt, p); check_error(); }
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@ -111,6 +111,26 @@ namespace Microsoft.Z3
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}
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}
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/// <summary>
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/// Creates a backtracking point.
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/// </summary>
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/// <seealso cref="Pop"/>
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public void Push()
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{
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Native.Z3_optimize_push(Context.nCtx, NativeObject);
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}
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/// <summary>
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/// Backtrack one backtracking point.
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/// </summary>
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/// <remarks>Note that an exception is thrown if Pop is called without a corresponding <c>Push</c></remarks>
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/// <seealso cref="Push"/>
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public void Pop()
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{
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Native.Z3_optimize_pop(Context.nCtx, NativeObject);
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}
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/// <summary>
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/// The model of the last <c>Check</c>.
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/// </summary>
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@ -6382,6 +6382,14 @@ class Optimize(Z3PPObject):
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"""Add objective function to minimize."""
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return OptimizeObjective(Z3_optimize_minimize(self.ctx.ref(), self.optimize, arg.as_ast()))
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def push(self):
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"""create a backtracking point for added rules, facts and assertions"""
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Z3_optimize_push(self.ctx.ref(), self.optimize)
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def pop(self):
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"""restore to previously created backtracking point"""
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Z3_optimize_pop(self.ctx.ref(), self.optimize)
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def check(self):
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"""Check satisfiability while optimizing objective functions."""
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return CheckSatResult(Z3_optimize_check(self.ctx.ref(), self.optimize))
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@ -6007,7 +6007,7 @@ END_MLAPI_EXCLUDE
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/**
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\brief Add a maximiztion constraint.
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\brief Add a maximization constraint.
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\param c - context
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\param o - optimization context
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\param a - arithmetical term
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@ -6016,7 +6016,7 @@ END_MLAPI_EXCLUDE
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unsigned Z3_API Z3_optimize_maximize(Z3_context, Z3_optimize o, Z3_ast t);
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/**
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\brief Add a minimiztion constraint.
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\brief Add a minimization constraint.
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\param c - context
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\param o - optimization context
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\param a - arithmetical term
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@ -6025,6 +6025,30 @@ END_MLAPI_EXCLUDE
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*/
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unsigned Z3_API Z3_optimize_minimize(Z3_context, Z3_optimize o, Z3_ast t);
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/**
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\brief Create a backtracking point.
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The optimize solver contains a set of rules, added facts and assertions.
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The set of rules, facts and assertions are restored upon calling #Z3_optimize_pop.
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\sa Z3_optimize_pop
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def_API('Z3_optimize_push', VOID, (_in(CONTEXT), _in(OPTIMIZE)))
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*/
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void Z3_API Z3_optimize_push(Z3_context c,Z3_optimize d);
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/**
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\brief Backtrack one level.
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\sa Z3_optimize_push
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\pre The number of calls to pop cannot exceed calls to push.
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def_API('Z3_optimize_pop', VOID, (_in(CONTEXT), _in(OPTIMIZE)))
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*/
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void Z3_API Z3_optimize_pop(Z3_context c,Z3_optimize d);
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/**
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\brief Check consistency and produce optimal values.
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\param c - context
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