Reorganizing code base

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

src/ast/ast_lt.h

@@ -0,0 +1,35 @@
+/*++
+Copyright (c) 2011 Microsoft Corporation
+
+Module Name:
+
+    ast_lt.h
+
+Abstract:
+
+    Total order on ASTs that does not depend on the internal ids.
+
+Author:
+
+    Leonardo de Moura (leonardo) 2011-04-08
+
+Revision History:
+
+--*/
+#ifndef _AST_LT_H_
+#define _AST_LT_H_
+
+class ast;
+
+bool lt(ast * n1, ast * n2);
+
+struct ast_to_lt {
+    bool operator()(ast * n1, ast * n2) const { return lt(n1, n2); }
+};
+
+bool lex_lt(unsigned num, ast * const * n1, ast * const * n2);
+inline bool lex_lt(unsigned num, expr * const * n1, expr * const * n2) {
+    return lex_lt(num, reinterpret_cast<ast*const*>(n1), reinterpret_cast<ast*const*>(n2));
+}
+
+#endif