Ticket 9851 - adaptors should perform concept check assertions.

test/compile_fail/adaptor/reversed_concept.cpp

@@ -0,0 +1,23 @@
+// Boost.Range library
+//
+// Copyright Neil Groves 2014. Use, modification and distribution is subject
+// to the Boost Software License, Version 1.0. (See accompanying file
+// LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+//
+// For more information, see http://www.boost.org/libs/range
+//
+
+#include "mock_range.hpp"
+#include <boost/range/adaptor/reversed.hpp>
+
+int main(int, const char**)
+{
+    using boost::range::unit_test::mock_range;
+    using boost::adaptors::reversed;
+
+    // This next line should fail when Boost.Range concept checking is
+    // enabled since the adaptor takes at least a BidirectionalRange.
+    return (mock_range<boost::forward_traversal_tag>() | reversed).front();
+}
+