From 2f6f63b25c64e36047878fded9d14030b8c3b6d8 Mon Sep 17 00:00:00 2001
From: Nan Xiao <nan@chinadtrace.org>
Date: Tue, 24 Apr 2018 09:23:36 +0800
Subject: [PATCH] Use C++14 feature: decltype(auto)

---
 ThreadPool.h | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/ThreadPool.h b/ThreadPool.h
index 4183203..3a28c45 100644
--- a/ThreadPool.h
+++ b/ThreadPool.h
@@ -15,8 +15,7 @@ class ThreadPool {
 public:
     ThreadPool(size_t);
     template<class F, class... Args>
-    auto enqueue(F&& f, Args&&... args) 
-        -> std::future<typename std::result_of<F(Args...)>::type>;
+    decltype(auto) enqueue(F&& f, Args&&... args);
     ~ThreadPool();
 private:
     // need to keep track of threads so we can join them
@@ -60,8 +59,7 @@ inline ThreadPool::ThreadPool(size_t threads)
 
 // add new work item to the pool
 template<class F, class... Args>
-auto ThreadPool::enqueue(F&& f, Args&&... args) 
-    -> std::future<typename std::result_of<F(Args...)>::type>
+decltype(auto) ThreadPool::enqueue(F&& f, Args&&... args)
 {
     using return_type = typename std::result_of<F(Args...)>::type;