updated

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

src/ast/term_enumeration.h

@@ -0,0 +1,46 @@
+#pragma once
+
+#include "ast/ast.h"
+#include <functional>
+
+class term_enumeration {
+    struct imp;
+    imp* m_imp;
+public:
+    term_enumeration(ast_manager& m);
+    ~term_enumeration();
+
+    void add_production(func_decl* f);
+    void add_production(expr* e);
+
+    // cost function associated with expressions.
+    // terms are enumerated with increasing cost.
+
+    void set_cost(std::function<unsigned(expr*)> const& cost);
+
+    class iterator {
+        struct iter_imp;
+        iter_imp* m_imp;
+    public:
+        iterator(imp& i, sort* s);
+        iterator(std::nullptr_t);
+        iterator(iterator const& other);
+        iterator& operator=(iterator const& other);
+        ~iterator();
+        expr* operator*();
+        iterator operator++(int);
+        iterator& operator++();
+        bool operator!=(iterator const& other) const;
+    };
+
+    class terms {
+        imp* m_imp;
+        sort* m_sort;
+    public:
+        terms(imp* i, sort* s);
+        iterator begin();
+        iterator end();
+    };
+
+    terms enum_terms(sort* s);
+};