Make sure all classes have sensible copy semantics

[libs/core.git] / source / core / meta.h

diff --git a/source/core/meta.h b/source/core/meta.h
index f12aede28a60029fd875377610d161d21ca63f61..a13f5cb3a5714de60aba9a7bdc5682370aac110a 100644 (file)
--- 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 +13,43 @@ template<typename T>
 struct RemoveConst<const T>
 { typedef T Type; };
 
+
+template<typename T>
+struct RemoveReference
+{ typedef T Type; };
+
+template<typename T>
+struct RemoveReference<T &>
+{ typedef T 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<size_t s>
+       struct Evaluate
+       {
+               enum { value = (s==sizeof(Yes)) };
+       };
+};
+
 } // namespace Msp
 
 #endif