Inequality operator added for Material

Redmine: #1858

Core/Material/Material.cpp

@@ -95,3 +95,8 @@ bool operator==(const Material& left, const Material& right)
     return true;
 }
 
+bool operator!=(const Material& left, const Material& right)
+{
+    return !(left == right);
+}
+

Core/Material/Material.h

@@ -96,7 +96,10 @@ private:
     std::unique_ptr<BaseMaterialImpl> m_material_impl;
 };
 
-//! Comparison operator for material wrapper
+//! Comparison operator for material wrapper (equality check)
 BA_CORE_API_ bool operator==(const Material& left, const Material& right);
 
+//! Comparison operator for material wrapper (inequality check)
+BA_CORE_API_ bool operator!=(const Material& left, const Material& right);
+
 #endif /* MATERIAL_H_ */