From: Mikko Rasa <tdb@tdb.fi>
Date: Mon, 10 Mar 2008 00:52:03 +0000 (+0000)
Subject: Add Variant class
X-Git-Tag: 1.0~9
X-Git-Url: http://git.tdb.fi/?a=commitdiff_plain;h=773a089db67a6293ac057e3160a43cceab8e5c1e;p=libs%2Fcore.git

Add Variant class
Fix svn:keywords property on core/*
---

diff --git a/source/core/variant.h b/source/core/variant.h
new file mode 100644
index 0000000..b81bb50
--- /dev/null
+++ b/source/core/variant.h
@@ -0,0 +1,69 @@
+/* $Id$
+
+This file is part of libmspcore
+Copyright © 2006-2007 Mikko Rasa, Mikkosoft Productions
+Distributed under the LGPL
+*/
+
+#ifndef MSP_CORE_VARIANT_H_
+#define MSP_CORE_VARIANT_H_
+
+#include "except.h"
+
+namespace Msp {
+
+class Variant
+{
+private:
+	struct StoreBase
+	{
+		virtual ~StoreBase() { }
+	};
+
+	template<typename T>
+	struct Store: public StoreBase
+	{
+		T data;
+
+		Store(T d): data(d) { }
+	};
+
+	StoreBase *store;
+
+public:
+	Variant(): store(0) { }
+	template<typename T>
+	Variant(T v): store(new Store<T>(v)) { }
+	~Variant() { delete store; }
+
+	template<typename T>
+	Variant &operator=(T v)
+	{
+		delete store;
+		store=new Store<T>(v);
+		return *this;
+	}
+
+	template<typename T>
+	T value() const
+	{
+		Store<T> *s=dynamic_cast<Store<T> *>(store);
+		if(!s)
+			throw InvalidState("Type mismatch");
+		return s->data;
+	}
+
+	template<typename T>
+	bool check_type() const
+	{
+		return dynamic_cast<Store<T> *>(store)!=0;
+	}
+
+	template<typename T>
+	operator T() const
+	{ return value<T>(); }
+};
+
+} // namespace Msp
+
+#endif