add new example of chained coroutines

example/Jamfile.v2

@@ -47,3 +47,7 @@ exe parser
 exe segmented
     : segmented.cpp
     ;
+
+exe chained
+    : chained.cpp
+    ;

example/chained.cpp

@@ -0,0 +1,70 @@
+
+//          Copyright Oliver Kowalke 2014.
+// 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 <cstdlib>
+#include <iostream>
+
+#include <boost/coroutine2/all.hpp>
+
+template<typename coroutine>
+struct test
+{
+    using pull_type = typename coroutine::pull_type;
+    using push_type = typename coroutine::push_type;
+
+    pull_type * child = nullptr;
+
+    void start_child_coroutine()
+    {
+        child = new pull_type
+        (
+            [](push_type & yield)
+            {
+                std::cout << "2";
+                yield();
+                std::cout << "2";
+                yield();
+                std::cout << "2";
+                yield();
+                std::cout << "2";
+                yield();
+                std::cout << "2";
+                yield();
+                std::cout << "2";
+            }
+        );
+    }
+
+    pull_type start_parent_coroutine()
+    {
+        return pull_type
+        (
+            [this](push_type & yield)
+            {
+                std::cout << "1";
+                start_child_coroutine();
+                yield();
+                std::cout << "1";
+            }
+        );
+    }
+
+    test()
+    {
+        auto parent = start_parent_coroutine();
+        while (*child)
+        {
+            (*child)();
+        }
+        std::cout << std::endl;
+    }
+};
+
+
+int main() {
+    test<boost::coroutines2::coroutine<void>> t2;
+    std::cout << "Done" << std::endl;
+}