adding fusion docs and tests

[SVN r34920]

test/sequence/single_view.cpp

@@ -0,0 +1,58 @@
+/*=============================================================================
+    Copyright (c) 2001-2006 Joel de Guzman
+
+    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)
+==============================================================================*/
+#include <boost/detail/lightweight_test.hpp>
+#include <boost/fusion/sequence/io/out.hpp>
+#include <boost/fusion/sequence/view/single_view/single_view.hpp>
+#include <boost/fusion/sequence/intrinsic/begin.hpp>
+#include <boost/fusion/iterator/deref.hpp>
+
+struct X {};
+
+template <typename OS>
+OS& operator<<(OS& os, X const&)
+{
+    os << "<X-object>";
+    return os;
+}
+
+void foo() {}
+
+int
+main()
+{
+    using namespace boost::fusion;
+
+    std::cout << tuple_open('[');
+    std::cout << tuple_close(']');
+    std::cout << tuple_delimiter(", ");
+
+    {
+        single_view<int> view1(3);
+        std::cout << view1 << std::endl;
+        
+#ifdef FUSION_TEST_FAIL
+        // single_view is immutable
+        *begin(view1) += 4;
+#endif
+        std::cout << view1 << std::endl;
+        BOOST_TEST(*begin(view1) == 3);
+        BOOST_TEST(view1.val == 3);
+
+        single_view<X> view2;
+        std::cout << view2 << std::endl;
+    }
+    
+    {
+        std::cout << make_single_view(1) << std::endl;
+        std::cout << make_single_view("Hello, World") << std::endl;
+        std::cout << make_single_view(&foo) << std::endl;
+    }
+
+    return boost::report_errors();
+}
+