Thread: merge from trunk 1.53

[SVN r81667]

example/make_future.cpp

@@ -0,0 +1,42 @@
+// Copyright (C) 2012 Vicente Botet
+//
+//  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)
+
+#define BOOST_THREAD_VERSION 4
+
+#include <boost/thread/future.hpp>
+#include <iostream>
+
+int p1() { return 5; }
+
+boost::future<int> compute(int x)
+{
+  if (x == 0) return boost::make_future(0);
+  if (x < 0) return boost::make_future(-1);
+  //boost::future<int> f1 = boost::async([]() { return x+1; });
+  boost::future<int> f1 = boost::async(boost::launch::async, p1);
+  return boost::move(f1);
+}
+boost::shared_future<int> shared_compute(int x)
+{
+  if (x == 0) return boost::make_shared_future(0);
+  if (x < 0) return boost::make_shared_future(-1);
+  //boost::future<int> f1 = boost::async([]() { return x+1; });
+  boost::shared_future<int> f1 = boost::async(p1).share();
+  return boost::move(f1);
+}
+
+
+int main()
+{
+  {
+    boost::future<int> f = compute(2);
+    std::cout << f.get() << std::endl;
+  }
+  {
+    boost::shared_future<int> f = shared_compute(2);
+    std::cout << f.get() << std::endl;
+  }
+  return 0;
+}