widget/gtk/nsGtkUtils.h

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /* vim:expandtab:shiftwidth=4:tabstop=4:
   3  */
   4 /* This Source Code Form is subject to the terms of the Mozilla Public
   5  * License, v. 2.0. If a copy of the MPL was not distributed with this
   6  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   7
   8 #ifndef nsGtkUtils_h__
   9 #define nsGtkUtils_h__
  10
  11 #include <glib.h>
  12
  13 // Some gobject functions expect functions for gpointer arguments.
  14 // gpointer is void* but C++ doesn't like casting functions to void*.
  15 template<class T> static inline gpointer
  16 FuncToGpointer(T aFunction)
  17 {
  18     return reinterpret_cast<gpointer>
  19         (reinterpret_cast<uintptr_t>
  20          // This cast just provides a warning if T is not a function.
  21          (reinterpret_cast<void (*)()>(aFunction)));
  22 }
  23
  24 #endif // nsGtkUtils_h__