From 04b1f2936c606313ee28b505ec7cdcb81875cd8d Mon Sep 17 00:00:00 2001
From: Yuri Kunde Schlesner <yuriks@yuriks.net>
Date: Sun, 2 Nov 2014 17:34:14 -0200
Subject: Add SCOPE_EXIT macro to conveniently execute cleanup actions

---
 src/common/scope_exit.h | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 src/common/scope_exit.h

(limited to 'src/common/scope_exit.h')

diff --git a/src/common/scope_exit.h b/src/common/scope_exit.h
new file mode 100644
index 00000000..1d3e5931
--- /dev/null
+++ b/src/common/scope_exit.h
@@ -0,0 +1,37 @@
+// Copyright 2014 Citra Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+namespace detail {
+    template <typename Func>
+    struct ScopeExitHelper {
+        explicit ScopeExitHelper(Func&& func) : func(std::move(func)) {}
+        ~ScopeExitHelper() { func(); }
+
+        Func func;
+    };
+
+    template <typename Func>
+    ScopeExitHelper<Func> ScopeExit(Func&& func) { return ScopeExitHelper<Func>(std::move(func)); }
+}
+
+/**
+ * This macro allows you to conveniently specify a block of code that will run on scope exit. Handy
+ * for doing ad-hoc clean-up tasks in a function with multiple returns.
+ *
+ * Example usage:
+ * \code
+ * const int saved_val = g_foo;
+ * g_foo = 55;
+ * SCOPE_EXIT({ g_foo = saved_val; });
+ *
+ * if (Bar()) {
+ *     return 0;
+ * } else {
+ *     return 20;
+ * }
+ * \endcode
+ */
+#define SCOPE_EXIT(body) auto scope_exit_helper_##__LINE__ = detail::ScopeExit([&]() body)
-- 
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