Add equality comparison for Variant

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

diff --git a/source/core/meta.h b/source/core/meta.h
index 8015f42370837e2ba6633acb0ee9b50a87ca9273..6998c5d1b8a712d69176a556e7c677bb745b9ec2 100644 (file)
--- a/source/core/meta.h
+++ b/source/core/meta.h
@@ -58,6 +58,18 @@ struct Sfinae
        };
 };
 
+
+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