added == operator

size.h

@@ -24,6 +24,7 @@ public:
     void setHeight(uint32 value);
 
     bool constexpr isNull() const;
+    bool constexpr operator==(const Size &other);
     std::string toString() const;
 
 private:
@@ -87,6 +88,14 @@ inline constexpr bool Size::isNull() const
     return (m_width == 0) && (m_height == 0);
 }
 
+/*!
+ * \brief Returns whether this instance equals \a other.
+ */
+inline constexpr bool Size::operator==(const Size &other)
+{
+    return (m_width == other.m_width) && (m_height == other.m_height);
+}
+
 /*!
  * \brief Returns the string representation of the current size.
  */