Base/Axis/Coordinate: add explicit implementation of operator ==

Base/Axis/Coordinate.h

@@ -28,7 +28,10 @@ public:
     Coordinate(const std::string& label);
     Coordinate(const std::string& name, const std::string& unit);
 
-    bool operator==(const Coordinate& other) const = default;
+    bool operator==(const Coordinate& other) const
+    {
+        return (m_name == other.m_name && m_unit == other.m_unit);
+    }
 
     const std::string& name() const { return m_name; }
     const std::string& unit() const { return m_unit; }