[gtkmm/vector] Added TypeTraits for Gdk::Point.

[Krzesimir Nowak <krnowak src gnome org>]

commit 19cdf19786bac518b0f29b019b4b89a24f1760bd
Author: Krzesimir Nowak <qdlacz gmail com>
Date:   Sun Jan 23 12:17:27 2011 +0100

    Added TypeTraits for Gdk::Point.
    
    This allows us to avoid reinterpreting Gdk::Color into GdkColor.

 gdk/src/types.hg |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)
---
diff --git a/gdk/src/types.hg b/gdk/src/types.hg
index 7e9c86b..f9a5774 100644
--- a/gdk/src/types.hg
+++ b/gdk/src/types.hg
@@ -100,6 +100,18 @@ inline bool operator!=(const Point& lhs, const Point& rhs)
   { return !lhs.equal(rhs); }
 
 #ifndef DOXYGEN_SHOULD_SKIP_THIS
+struct PointTraits
+{
+  typedef Gdk::Point     CppType;
+  typedef const GdkPoint CType;
+  typedef GdkPoint       CTypeNonConst;
+
+  static CType   to_c_type      (CType c_obj)            { return c_obj; }
+  static void    release_c_type (CType)                  {}
+  static CType   to_c_type      (const CppType& cpp_obj) { return *(cpp_obj.gobj ()); }
+  static CppType to_cpp_type    (CType c_obj)            { return CppType (c_obj.x, c_obj.y); }
+};
+
 struct AtomStringTraits
 {
   typedef std::string CppType;