Testsuite for none_t added.

[SVN r37421]

test/Jamfile.v2

@@ -33,4 +33,5 @@ test-suite utility
         [ compile-fail ../value_init_test_fail1.cpp ]
         [ compile-fail ../value_init_test_fail2.cpp ]
         [ compile-fail ../value_init_test_fail3.cpp ]
+        [ run none_test.cpp ]
     ;

test/none_test.cpp

@@ -0,0 +1,22 @@
+// Copyright 2007 Fernando Luis Cacciola Carballal.  Use, modification, and distribution
+// are subject to the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or a copy at
+// http://www.boost.org/LICENSE_1_0.txt.)
+
+// See http://www.boost.org/libs/utility for documentation.
+
+// Boost test program for noost::none_t and boost::none
+
+// Test strategy contributed by Richard Smith
+
+#include <boost/optional/optional.hpp> // Test none.hpp is included with <optional.hpp>
+
+// Left undefined to cause a linker error if this overload is incorrectly selected.
+void verify_no_implicit_conversion_to_int ( int i ) ;
+
+void verify_no_implicit_conversion_to_int ( boost::optional<int> const& ) {}
+
+int main() 
+{
+  verify_no_implicit_conversion_to_int( boost::none );
+}