ui/gfx/scoped_gobject.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef UI_GFX_SCOPED_GOBJECT_H_
   6 #define UI_GFX_SCOPED_GOBJECT_H_
   7
   8 #include <glib-object.h>
   9
  10 #include "base/memory/scoped_ptr.h"
  11
  12 namespace ui {
  13
  14 // It's not legal C++ to have a templatized typedefs, so we wrap it in a
  15 // struct.  When using this, you need to include ::Type.  E.g.,
  16 // ScopedGObject<GdkPixbufLoader>::Type loader(gdk_pixbuf_loader_new());
  17 template<class T>
  18 struct ScopedGObject {
  19   // A helper class that will g_object_unref |p| when it goes out of scope.
  20   // This never adds a ref, it only unrefs.
  21   template<class U>
  22   struct GObjectUnrefer {
  23     void operator()(U* ptr) const {
  24       if (ptr)
  25         g_object_unref(ptr);
  26     }
  27   };
  28
  29   typedef scoped_ptr<T, GObjectUnrefer<T> > Type;
  30 };
  31
  32 }  // namespace ui
  33
  34 #endif  // UI_GFX_SCOPED_GOBJECT_H_