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: [PATCH] Add SCOPE_EXIT macro to conveniently execute cleanup actions
---
src/common/CMakeLists.txt | 1 +
src/common/scope_exit.h | 37 +++++++++++++++++++++++++++++++++++++
2 files changed, 38 insertions(+)
create mode 100644 src/common/scope_exit.h
diff --git a/src/common/CMakeLists.txt b/src/common/CMakeLists.txt
index 9d5a90762..1dbc5db21 100644
--- a/src/common/CMakeLists.txt
+++ b/src/common/CMakeLists.txt
@@ -51,6 +51,7 @@ set(HEADERS
msg_handler.h
platform.h
scm_rev.h
+ scope_exit.h
string_util.h
swap.h
symbols.h
diff --git a/src/common/scope_exit.h b/src/common/scope_exit.h
new file mode 100644
index 000000000..1d3e59319
--- /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)