1 files changed, 105 insertions, 0 deletions
diff --git a/ml/dlib/dlib/threads/async.h b/ml/dlib/dlib/threads/async.h
new file mode 100644
index 000000000..bc6fe5575
--- /dev/null
+++ b/ml/dlib/dlib/threads/async.h
@@ -0,0 +1,105 @@
+// Copyright (C) 2016  Davis E. King (davis@dlib.net)
+// License: Boost Software License   See LICENSE.txt for the full license.
+#ifndef DLIB_AsYNC_Hh_
+#define DLIB_AsYNC_Hh_ 
+
+// C++11 things don't work in old versions of visual studio 
+#if !defined( _MSC_VER) ||  _MSC_VER >= 1900
+
+#include "async_abstract.h"
+#include "thread_pool_extension.h"
+#include <future>
+#include <functional>
+
+namespace dlib
+{
+
+// ----------------------------------------------------------------------------------------
+
+    namespace impl
+    {
+        template <typename T> struct selector {};
+
+        template <typename T, typename U, typename V>
+        void call_prom_set_value(
+            T& prom,
+            U& fun,
+            selector<V> 
+        )
+        {
+            prom.set_value(fun());
+        }
+
+        template <typename T, typename U>
+        void call_prom_set_value(
+            T& prom,
+            U& fun,
+            selector<void>
+        )
+        {
+            fun();
+            prom.set_value();
+        }
+    }
+
+// ----------------------------------------------------------------------------------------
+
+    thread_pool& default_thread_pool();
+
+// ----------------------------------------------------------------------------------------
+
+    template < 
+        typename Function, 
+        typename ...Args
+        >
+    std::future<typename std::result_of<Function(Args...)>::type> async(
+        thread_pool& tp, 
+        Function&& f, 
+        Args&&... args 
+    )
+    {
+        auto prom = std::make_shared<std::promise<typename std::result_of<Function(Args...)>::type>>();
+        std::future<typename std::result_of<Function(Args...)>::type> ret = prom->get_future();
+        using bind_t = decltype(std::bind(std::forward<Function>(f), std::forward<Args>(args)...));
+        auto fun = std::make_shared<bind_t>(std::bind(std::forward<Function>(f), std::forward<Args>(args)...));
+        tp.add_task_by_value([fun, prom]()
+        { 
+            try
+            {
+                impl::call_prom_set_value(*prom, *fun, impl::selector<typename std::result_of<Function(Args...)>::type>());
+            }
+            catch(...)
+            {
+                prom->set_exception(std::current_exception());
+            }
+        });
+        return std::move(ret);
+    }
+
+// ----------------------------------------------------------------------------------------
+
+    template < 
+        typename Function, 
+        typename ...Args
+        >
+    std::future<typename std::result_of<Function(Args...)>::type> async(
+        Function&& f, 
+        Args&&... args 
+    )
+    {
+        return async(default_thread_pool(), std::forward<Function>(f), std::forward<Args>(args)...);
+    }
+
+}
+
+// ----------------------------------------------------------------------------------------
+
+#ifdef NO_MAKEFILE
+#include "async.cpp"
+#endif
+
+#endif
+#endif // DLIB_AsYNC_Hh_
+
+
+