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extern/stdcxx/4.2.1/tests/regress/24.operations.stdcxx-234.cpp

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+/***************************************************************************
+ *
+ * 24.operations.stdcxx-234 - regression test for STDCXX-234
+ *   http://issues.apache.org/jira/browse/STDCXX-234
+ *
+ * $Id: 24.operations.stdcxx-234.cpp 580483 2007-09-28 20:55:52Z sebor $
+ *
+ ***************************************************************************
+ *
+ * Licensed to the Apache Software  Foundation (ASF) under one or more
+ * contributor  license agreements.  See  the NOTICE  file distributed
+ * with  this  work  for  additional information  regarding  copyright
+ * ownership.   The ASF  licenses this  file to  you under  the Apache
+ * License, Version  2.0 (the  "License"); you may  not use  this file
+ * except in  compliance with the License.   You may obtain  a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the  License is distributed on an  "AS IS" BASIS,
+ * WITHOUT  WARRANTIES OR CONDITIONS  OF ANY  KIND, either  express or
+ * implied.   See  the License  for  the  specific language  governing
+ * permissions and limitations under the License.
+ *
+ * Copyright 2007 Rogue Wave Software, Inc.
+ *
+ **************************************************************************/
+
+#include <iterator>
+
+struct X: std::iterator<std::random_access_iterator_tag, int> { };
+
+namespace std {
+
+// specialize the std::distance() function template of a user-defined
+// iterator type to verify that the signature of the primary template
+// is the same as the one of the specialization
+template <> std::iterator_traits<X>::difference_type
+distance<X> (X, X) { return 0; }
+
+} // namespace std
+
+int main ()
+{
+    return std::distance (X (), X ());
+}