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+//===-- MIUtilSingletonBase.h -----------------------------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+//++
+// File: MIUtilSingletonBase.h
+//
+// Overview: MI::ISingleton interface.
+//
+// Environment: Compilers: Visual C++ 12.
+// gcc (Ubuntu/Linaro 4.8.1-10ubuntu9) 4.8.1
+// Libraries: See MIReadmetxt.
+//
+// Copyright: None.
+//--
+
+#pragma once
+
+namespace MI
+{
+
+// MI::ISingleton base class usage:
+//
+// class CMIDerivedClass
+// : public MI::ISingleton< CMIDerivedClass >
+// {
+// friend MI::ISingleton< CMIDerivedClass >;
+//
+// // Overridden:
+// public:
+// // From MI::ISingleton
+// virtual bool Initialize( void );
+// virtual bool Shutdown( void );
+// };
+
+//++ ============================================================================
+// Details: Base class for the singleton pattern.
+// Gotchas: Derived class must specify MI::ISingleton<> as a friend class.
+// Authors: Aidan Dodds 17/03/2014.
+// Changes: None.
+//--
+template< typename T >
+class ISingleton
+{
+// Statics:
+public:
+ // Return an instance of the derived class
+ static T & Instance( void )
+ {
+ // This will fail if the derived class has not
+ // declared itself to be a friend of MI::ISingleton
+ static T instance;
+
+ return instance;
+ }
+
+// Overrideable:
+public:
+ virtual bool Initialize( void ) = 0;
+ virtual bool Shutdown( void ) = 0;
+ //
+ /* dtor */ virtual ~ISingleton( void ) { };
+};
+
+} // namespace MI
+