continue great segmented Fusion reorg

[SVN r73834]

test/algorithm/segmented_fold.cpp

@@ -0,0 +1,62 @@
+/*=============================================================================
+    Copyright (c) 2001-2006 Joel de Guzman
+    Copyright (c) 2011 Eric Niebler
+
+    Distributed under 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 <sstream>
+#include <iostream>
+#include <boost/detail/lightweight_test.hpp>
+#include <boost/fusion/container/vector/vector.hpp>
+#include <boost/fusion/algorithm/iteration/ext_/fold_s.hpp>
+#include <boost/fusion/container/generation/make_vector.hpp>
+#include "../sequence/tree.hpp"
+
+struct write_string
+{
+    typedef std::ostream* result_type;
+
+    template<typename T>
+    std::ostream* operator()(std::ostream* sout, T const& t) const
+    {
+        return &(*sout << t << " ");
+    }
+};
+
+template<typename Tree>
+void 
+process_tree(Tree const &tree)
+{
+    using namespace boost;
+
+    std::stringstream str;
+    fusion::fold_s(tree, &str, write_string());
+    std::string res = str.str();
+
+    BOOST_TEST_EQ(res, "a b c 1 2 3 100 e f 0 B 1 h i 4 5 6 j k l ");
+}
+
+int
+main()
+{
+    using namespace boost::fusion;
+    process_tree(
+        make_tree(
+            make_vector(double(0),'B')
+            , make_tree(
+                make_vector(1,2,long(3))
+                , make_tree(make_vector('a','b','c'))
+                , make_tree(make_vector(short('d'),'e','f'))
+            )
+            , make_tree(
+                make_vector(4,5,6)
+                , make_tree(make_vector(float(1),'h','i'))
+                , make_tree(make_vector('j','k','l'))
+            )
+        )
+    );
+
+    return boost::report_errors();
+}
+