[gtkmm] Gdk::Rectangle: Add operator==().

[Murray Cumming <murrayc src gnome org>]

commit 4822f6bc25e8981f4ab2a82846f02c99d5e76d7a
Author: Murray Cumming <murrayc murrayc com>
Date:   Fri Nov 20 13:13:07 2015 +0100

    Gdk::Rectangle: Add operator==().
    
    Using the new gdk_rectangle_equal().

 gdk/src/rectangle.ccg |   10 ++++++++++
 gdk/src/rectangle.hg  |    5 +++++
 2 files changed, 15 insertions(+), 0 deletions(-)
---
diff --git a/gdk/src/rectangle.ccg b/gdk/src/rectangle.ccg
index 599e80c..ec563d8 100644
--- a/gdk/src/rectangle.ccg
+++ b/gdk/src/rectangle.ccg
@@ -27,6 +27,16 @@ Rectangle::Rectangle(int x, int y, int width, int height)
   gobject_.height = height;
 }
 
+bool Rectangle::operator==(const Rectangle& src) const
+{
+  if(!gobj() && !src.gobj())
+    return true;
+  else if (!gobj() || !src.gobj())
+    return false;
+
+  return gdk_rectangle_equal(gobj(), src.gobj());
+}
+
 // gdk_rectangle_union() and gdk_rectangle_intersect() work fine even if
 // the destination points to one of the input rectangles.  The join() and
 // intersect() implementations rely on this ability.
diff --git a/gdk/src/rectangle.hg b/gdk/src/rectangle.hg
index 06772c3..d9fdbcd 100644
--- a/gdk/src/rectangle.hg
+++ b/gdk/src/rectangle.hg
@@ -36,6 +36,11 @@ public:
   /** Creates a new rectangle instance with these dimensions.
    */
   Rectangle(int x, int y, int width, int height);
+  
+  /**
+   * @newin{3,20}
+   */
+  bool operator==(const Rectangle& src) const;
 
   // 'union' is a C and C++ keyword. Can't be a method name.
   /** Calculates the union of two rectangles, changing this rectangle.