From 4007f34e22e7138a17675e1f9fb8cb0dee3d7bd7 Mon Sep 17 00:00:00 2001
From: Mathew Sutcliffe <oktal3700@gmail.com>
Date: Sat, 6 Dec 2014 15:58:41 +0000
Subject: [PATCH] refs #247 Enabled equality comparison between CVariant and
 CValueObject.

---
 src/blackmisc/variant.h | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/src/blackmisc/variant.h b/src/blackmisc/variant.h
index 9e124db4f..b51d6b14b 100644
--- a/src/blackmisc/variant.h
+++ b/src/blackmisc/variant.h
@@ -205,6 +205,35 @@ namespace BlackMisc
         const void *data() const { return m_v.data(); }
     };
 
+    //! Compare stored value of CVariant with any CValueObject derived class.
+    template <class T, class = typename std::enable_if<std::is_base_of<CValueObject, T>::value>::type>
+    bool operator ==(const T &value, const CVariant &variant)
+    {
+        if (variant.canConvert<T>()) { return variant.value<T>() == value; }
+        return false;
+    }
+
+    //! Compare stored value of CVariant with any CValueObject derived class.
+    template <class T, class = typename std::enable_if<std::is_base_of<CValueObject, T>::value>::type>
+    bool operator !=(const T &value, const CVariant &variant)
+    {
+        return !(value == variant);
+    }
+
+    //! Compare stored value of CVariant with any CValueObject derived class.
+    template <class T, class = typename std::enable_if<std::is_base_of<CValueObject, T>::value>::type>
+    bool operator ==(const CVariant &variant, const T &value)
+    {
+        return value == variant;
+    }
+
+    //! Compare stored value of CVariant with any CValueObject derived class.
+    template <class T, class = typename std::enable_if<std::is_base_of<CValueObject, T>::value>::type>
+    bool operator !=(const CVariant &variant, const T &value)
+    {
+        return !(value == variant);
+    }
+
 } // namespace
 
 Q_DECLARE_METATYPE(BlackMisc::CVariant)