coroutine: initial commit

[SVN r81511]

example/unwind.cpp

@@ -0,0 +1,46 @@
+
+//          Copyright Oliver Kowalke 2009.
+// 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/bind.hpp>
+#include <boost/coroutine/all.hpp>
+
+typedef boost::coroutines::coroutine< void() >   coro_t;
+
+struct X : private boost::noncopyable
+{
+    X() { std::cout << "X()" << std::endl; }
+    ~X() { std::cout << "~X()" << std::endl; }
+};
+
+void fn( coro_t & ca)
+{
+    X x;
+    int i = 0;
+    while ( true)
+    {
+        std::cout << "fn() : " << ++i << std::endl;
+        ca();
+    }
+}
+
+int main( int argc, char * argv[])
+{
+    {
+        coro_t c( fn);
+        for ( int k = 0; k < 3; ++k)
+        {
+            c();
+        }
+        std::cout << "destroying coroutine and unwinding stack" << std::endl;
+    }
+
+    std::cout << "\nDone" << std::endl;
+
+    return EXIT_SUCCESS;
+}