1 files changed, 23 insertions, 0 deletions
diff --git a/widget/gtk/nsGtkUtils.h b/widget/gtk/nsGtkUtils.h
new file mode 100644
index 0000000000..58cf2eed16
--- /dev/null
+++ b/widget/gtk/nsGtkUtils.h
@@ -0,0 +1,23 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:expandtab:shiftwidth=4:tabstop=4:
+ */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsGtkUtils_h__
+#define nsGtkUtils_h__
+
+#include <glib.h>
+
+// Some gobject functions expect functions for gpointer arguments.
+// gpointer is void* but C++ doesn't like casting functions to void*.
+template <class T>
+static inline gpointer FuncToGpointer(T aFunction) {
+  return reinterpret_cast<gpointer>(
+      reinterpret_cast<uintptr_t>
+      // This cast just provides a warning if T is not a function.
+      (reinterpret_cast<void (*)()>(aFunction)));
+}
+
+#endif  // nsGtkUtils_h__