From 2d6dbd667ff989478f17458b670ccbec0630bda3 Mon Sep 17 00:00:00 2001
From: "pius.lee" <pius.lee@samsung.com>
Date: Fri, 16 Jan 2015 14:26:11 +0900
Subject: [PATCH] [Common] add scope out macro for easy releasing

Change-Id: I5181036cc35c4cd78b9863254905f8ea73abe9ee
Signed-off-by: pius.lee <pius.lee@samsung.com>
---
 src/common/scope_exit.h | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/src/common/scope_exit.h b/src/common/scope_exit.h
index e2ad9736..9de21928 100644
--- a/src/common/scope_exit.h
+++ b/src/common/scope_exit.h
@@ -72,6 +72,40 @@ ScopeExit<F> MakeScopeExit(F f) {
   return ScopeExit<F>(f);
 }
 
+// Internal use for macro SCOPE_EXIT
+template <typename F>
+ScopeExit<typename std::decay<F>::type>
+operator+(int, F&& f)
+{
+  return ScopeExit<typename std::decay<F>::type>
+  {std::forward<F>(f)};
+}
+
+/*
+ * This macro is for simple way to using ScopeExit
+ *
+ * Example:
+ *
+ *   struct unit;
+ *   struct unit* unit_new();
+ *   void unit_free(unit*);
+ *
+ *   void ExampleFunctionScope() {
+ *     struct unit* u = unit_new();
+ *
+ *     // automatic cleanup for all cases
+ *     SCOPE_EXIT {
+ *       unit_free(u);
+ *     };
+ *
+ *     // do 1st operation with unit and possibly quit function
+ *     // do 2nd operation with unit and possibly quit function
+ *     // do 3rd operation with unit and possibly quit function
+ *   }
+ */
+#define SCOPE_EXIT \
+    auto SCOPE_EXIT_##__LINE__ = 0 + [&]() noexcept
+
 }  // namespace common
 
 #endif  // COMMON_SCOPE_EXIT_H_
-- 
2.34.1