From ce8660cc5bfc12e6e3f75d4cce22492783ca9066 Mon Sep 17 00:00:00 2001
From: rtk0c <mail.tianyig@gmail.com>
Date: Thu, 8 Apr 2021 08:49:10 -0700
Subject: Initial work on table visualizer

---
 core/src/Utils/Macros.hpp     |  6 ++++++
 core/src/Utils/ScopeGuard.hpp | 35 +++++++++++++++++++++++++++++++++++
 2 files changed, 41 insertions(+)
 create mode 100644 core/src/Utils/Macros.hpp
 create mode 100644 core/src/Utils/ScopeGuard.hpp

(limited to 'core/src/Utils')

diff --git a/core/src/Utils/Macros.hpp b/core/src/Utils/Macros.hpp
new file mode 100644
index 0000000..cb949b2
--- /dev/null
+++ b/core/src/Utils/Macros.hpp
@@ -0,0 +1,6 @@
+#pragma  once
+
+#define CONCAT_IMPL(a, b) a##b
+#define CONCAT(a, b) CONCAT_IMPL(a, b)
+
+#define UNIQUE_NAME(prefix) CONCAT(prefix, __LINE__)
diff --git a/core/src/Utils/ScopeGuard.hpp b/core/src/Utils/ScopeGuard.hpp
new file mode 100644
index 0000000..ed8d4ea
--- /dev/null
+++ b/core/src/Utils/ScopeGuard.hpp
@@ -0,0 +1,35 @@
+#pragma once
+
+#include "Utils/Macros.hpp"
+
+#include <utility>
+
+template <class TCleanupFunc>
+class ScopeGuard {
+private:
+	TCleanupFunc mFunc;
+	bool mDismissed = false;
+
+public:
+	/// Specifically left this implicit so that constructs like
+	/// \code
+	/// ScopeGuard sg = [&]() { res.Cleanup(); };
+	/// \endcode
+	/// would work. It is highly discourage and unlikely that one would want to use ScopeGuard as a function
+	/// parameter, so the normal argument that implicit conversion are harmful doesn't really apply here.
+	ScopeGuard(TCleanupFunc func)
+		: mFunc{ std::move(func) } {
+	}
+
+	~ScopeGuard() {
+		if (!mDismissed) {
+			mFunc();
+		}
+	}
+
+	void Dismiss() noexcept {
+		mDismissed = true;
+	}
+};
+
+#define DEFER ScopeGuard UNIQUE_NAME(scopeGuard) = [&]()
-- 
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