Future::unit()

[folly.git] / folly / futures / helpers.h

diff --git a/folly/futures/helpers.h b/folly/futures/helpers.h
index 5ae28f1f4f41a092c34d981591a4fe2ef79f80be..c099f580b864d094b8b0ad0d2d945728e82c6740 100644 (file)
--- a/folly/futures/helpers.h
+++ b/folly/futures/helpers.h
@@ -56,7 +56,7 @@ namespace futures {
     return map(c.begin(), c.end(), std::forward<F>(func));
   }
 
-}
+} // namespace futures
 
 /**
   Make a completed Future by moving in a value. e.g.
@@ -124,6 +124,13 @@ inline Future<void> via(
     Executor* executor,
     int8_t priority = Executor::MID_PRI);
 
+/// Execute a function via the given executor and return a future.
+/// This is semantically equivalent to via(executor).then(func), but
+/// easier to read and slightly more efficient.
+template <class Func>
+auto via(Executor*, Func func)
+  -> Future<typename isFuture<decltype(func())>::Inner>;
+
 /** When all the input Futures complete, the returned Future will complete.
   Errors do not cause early termination; this Future will always succeed
   after all its Futures have finished (whether successfully or with an
@@ -286,4 +293,4 @@ auto unorderedReduce(Collection&& c, T&& initial, F&& func)
       std::forward<F>(func));
 }
 
-} // namespace folly
+} // namespace