Z3 sources

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

lib/expr2var.h

@@ -0,0 +1,75 @@
+/*++
+Copyright (c) 2011 Microsoft Corporation
+
+Module Name:
+
+    expr2var.h
+
+Abstract:
+
+    The mapping between Z3 expressions and (low level) variables.
+    Example of low level variables:
+       - SAT solver
+       - Polynomial 
+       - etc.
+
+Author:
+
+    Leonardo (leonardo) 2011-12-23
+
+Notes:
+
+--*/
+#ifndef _EXPR2VAR_H_
+#define _EXPR2VAR_H_
+
+#include"ast.h"
+#include"obj_hashtable.h"
+
+/**
+   \brief The mapping between Z3 expressions and (low level) variables.
+*/
+class expr2var {
+public:
+    typedef unsigned var;
+    typedef obj_map<expr, var> expr2var_mapping;
+    typedef expr2var_mapping::iterator iterator;
+    typedef ptr_vector<expr>::const_iterator recent_iterator;
+protected:
+    ast_manager &    m_manager;
+    expr2var_mapping m_mapping;
+    ptr_vector<expr> m_recent_exprs;
+    bool             m_interpreted_vars;
+public:
+    expr2var(ast_manager & m);
+    ~expr2var();
+
+    ast_manager & m() const { return m_manager; }
+
+    void insert(expr * n, var v);
+    
+    var to_var(expr * n) const;
+    
+    bool is_var(expr * n) const { return m_mapping.contains(n); }
+
+    void display(std::ostream & out) const;
+    
+    void mk_inv(expr_ref_vector & var2expr) const;
+
+    // return true if the mapping contains interpreted vars.
+    bool interpreted_vars() const { return m_interpreted_vars; }
+    
+    iterator begin() const { return m_mapping.begin(); }
+    iterator end() const { return m_mapping.end(); }
+
+    void reset_recent() { m_recent_exprs.reset(); }
+
+    // Iterators for traversing the recently registered expressions.
+    // The set of recent registered expressions is reset by using reset_recent().
+    recent_iterator begin_recent() const { return m_recent_exprs.begin(); }
+    recent_iterator end_recent() const { return m_recent_exprs.end(); }
+    
+    void reset();
+};
+
+#endif