Z3 sources

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>

lib/gaussian_elim.h

@@ -0,0 +1,66 @@
+/*++
+Copyright (c) 2011 Microsoft Corporation
+
+Module Name:
+
+    gaussian_elim.h
+
+Abstract:
+
+    (extended) Gaussian elimination for assertion sets.
+    It also supports other theories besides arithmetic.
+
+Author:
+
+    Leonardo (leonardo) 2011-04-21
+
+Notes:
+
+--*/
+#ifndef _GAUSSIAN_ELIM_H_
+#define _GAUSSIAN_ELIM_H_
+
+#include"assertion_set_strategy.h"
+
+class expr_replacer;
+
+MK_ST_EXCEPTION(gaussian_elim_exception);
+
+class gaussian_elim : public assertion_set_strategy {
+    struct     imp;
+    imp *      m_imp;
+    params_ref m_params;
+public:
+    gaussian_elim(ast_manager & m, params_ref const & p = params_ref(), expr_replacer * r = 0, bool owner = false);
+    virtual ~gaussian_elim();
+
+    ast_manager & m () const;
+    
+    virtual void updt_params(params_ref const & p);
+    static  void get_param_descrs(param_descrs & r);
+    virtual void collect_param_descrs(param_descrs & r) { get_param_descrs(r); }
+    
+    /**
+       \brief Apply gaussian elimination on the assertion set \c s.
+       Return a model_converter that converts any model for the updated set into a model for the old set.
+    */
+    virtual void operator()(assertion_set & s, model_converter_ref & mc);
+
+    virtual void cleanup();
+    
+    unsigned get_num_steps() const;
+    unsigned get_num_eliminated_vars() const;
+
+    virtual void collect_statistics(statistics & st) const;
+    virtual void reset_statistics();
+protected:
+    virtual void set_cancel(bool f);
+};
+
+as_st * mk_gaussian(ast_manager & m, params_ref const & p = params_ref());
+
+inline as_st * mk_eq_solver(ast_manager & m, params_ref const & p = params_ref()) {
+    return mk_gaussian(m, p);
+}
+
+#endif