[ox/std] Add defer

deps/ox/src/ox/std/CMakeLists.txt

@@ -23,6 +23,7 @@ add_library(
 		buffer.cpp
 		buildinfo.cpp
 		byteswap.cpp
+		defer.hpp
 		fmt.cpp
 		heapmgr.cpp
 		memops.cpp

deps/ox/src/ox/std/defer.hpp

@@ -0,0 +1,37 @@
+/*
+ * Copyright 2015 - 2021 gary@drinkingtea.net
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#pragma once
+
+#include "error.hpp"
+
+namespace ox {
+
+template<typename T>
+class Defer {
+	private:
+		T m_deferredFunc;
+
+	public:
+		Defer(T deferredFunc) {
+			m_deferredFunc = deferredFunc;
+		}
+
+		Defer(const Defer&) = delete;
+
+		~Defer() {
+			m_deferredFunc();
+		}
+
+		Defer &operator=(const Defer&) = delete;
+
+};
+
+}
+
+#define oxDefer Defer oxConcat(oxDefer_, __LINE__) = [&]

deps/ox/src/ox/std/std.hpp

@@ -12,6 +12,7 @@
 #include "bit.hpp"
 #include "bstring.hpp"
 #include "byteswap.hpp"
+#include "defer.hpp"
 #include "defines.hpp"
 #include "error.hpp"
 #include "fmt.hpp"