From 0cc22100e9ce737d4b2e181947582d00b6d65e43 Mon Sep 17 00:00:00 2001
From: Riyyi <riyyi3@gmail.com>
Date: Sat, 13 Feb 2021 16:09:45 +0100
Subject: [PATCH] Add singleton class

---
 inferno/src/inferno/singleton.h | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 inferno/src/inferno/singleton.h

diff --git a/inferno/src/inferno/singleton.h b/inferno/src/inferno/singleton.h
new file mode 100644
index 0000000..568f3dc
--- /dev/null
+++ b/inferno/src/inferno/singleton.h
@@ -0,0 +1,31 @@
+#ifndef SINGLETON_H
+#define SINGLETON_H
+
+#include <memory> // std::unique_ptr
+
+namespace Inferno {
+
+	template<typename T>
+	class Singleton {
+	public:
+		static inline T& the() {
+			static const std::unique_ptr<T> instance { new T { s {} } };
+			return *instance;
+		}
+
+		// Remove copy constructor and copy assignment operator
+		Singleton(const Singleton&) = delete;
+		Singleton& operator=(const Singleton&) = delete;
+		Singleton(Singleton&&) = delete;
+		Singleton& operator=(Singleton&&) = delete;
+
+	protected:
+		Singleton() {}
+
+		// Constructor token
+		struct s {};
+	};
+
+} // namespace Inferno
+
+#endif // SINGLETON_H