Z3 sources

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

lib/solver_plugin.h

@@ -0,0 +1,51 @@
+/*++
+Copyright (c) 2006 Microsoft Corporation
+
+Module Name:
+
+    solver_plugin.h
+
+Abstract:
+
+    <abstract>
+
+Author:
+
+    Leonardo de Moura (leonardo) 2008-06-30.
+
+Revision History:
+
+--*/
+#ifndef _SOLVER_PLUGIN_H_
+#define _SOLVER_PLUGIN_H_
+
+#include"ast.h"
+
+/**
+   \brief Abstract solver used during preprocessing step.
+*/
+class solver_plugin {
+protected:
+    ast_manager &   m_manager;
+    family_id       m_fid;
+public:
+    solver_plugin(symbol const & fname, ast_manager & m):m_manager(m), m_fid(m.get_family_id(fname)) {}
+    
+    virtual ~solver_plugin() {}
+
+    /**
+       \brief Return true if it is possible to solve lhs = rhs. The
+       arg. forbidden contains the set of variables that cannot be
+       used. Store the result (var = subst) in var and subst.
+
+       \remark Only simple solvers are supported. That is, the solution set has only one entry.
+    */
+    virtual bool solve(expr * lhs, expr * rhs, expr_mark const & forbidden, app_ref & var, expr_ref & subst) = 0;
+    
+    family_id get_family_id() const { return m_fid; }
+   
+    ast_manager & get_manager() { return m_manager; }
+};
+
+#endif /* _SOLVER_PLUGIN_H_ */
+