X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fcore%2Fmeta.h;h=6998c5d1b8a712d69176a556e7c677bb745b9ec2;hb=bff9d86e0e0ccf23ce4c34024fa2fc33e1f8ff68;hp=f6dff160ff9be99df60b2522d28bdd368d2a7d95;hpb=b56eb5ec1da675da0c66abc53c1e4f6c4e4cccbd;p=libs%2Fcore.git

diff --git a/source/core/meta.h b/source/core/meta.h
index f6dff16..6998c5d 100644
--- a/source/core/meta.h
+++ b/source/core/meta.h
@@ -1,13 +1,8 @@
-/* $Id$
-
-This file is part of libmspcore
-Copyright © 2008  Mikko Rasa, Mikkosoft Productions
-Distributed under the LGPL
-*/
-
 #ifndef MSP_CORE_META_H_
 #define MSP_CORE_META_H_
 
+#include <cstddef>
+
 namespace Msp {
 
 template<typename T>
@@ -18,6 +13,7 @@ template<typename T>
 struct RemoveConst<const T>
 { typedef T Type; };
 
+
 template<typename T>
 struct RemoveReference
 { typedef T Type; };
@@ -26,6 +22,54 @@ template<typename T>
 struct RemoveReference<T &>
 { typedef T Type; };
 
+
+template<typename T>
+struct RemoveConstReference
+{ typedef typename RemoveConst<typename RemoveReference<T>::Type>::Type Type; };
+
+
+template<bool c, typename R>
+struct EnableIf;
+
+template<typename R>
+struct EnableIf<true, R>
+{ typedef R Yes; };
+
+template<typename R>
+struct EnableIf<false, R>
+{ typedef R No; };
+
+
+/**
+Common fragments used in SFINAE-based decider constructs.
+*/
+struct Sfinae
+{
+	struct Yes { char c[2]; };
+	struct No { char c; };
+
+	template<typename T>
+	static No f(...);
+
+	template<typename C, typename T>
+	struct Evaluate
+	{
+		enum { value = (sizeof(C::template f<T>(0))==sizeof(Yes)) };
+	};
+};
+
+
+struct CheckEqualityComparable: Sfinae
+{
+	static int &v;
+	template<typename T>
+	static Yes f(int (*)[sizeof(reinterpret_cast<const T &>(v)==reinterpret_cast<const T &>(v))]);
+	using Sfinae::f;
+};
+
+template<typename T>
+struct IsEqualityComparable: Sfinae::Evaluate<CheckEqualityComparable, T> { };
+
 } // namespace Msp
 
 #endif