extracted wxGtkString in a separate file, it's also needed by wxX11

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@42120 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/private/string.h

@@ -0,0 +1,35 @@
+///////////////////////////////////////////////////////////////////////////////
+// Name:        wx/gtk/private/string.h
+// Purpose:     wxGtkString class declaration
+// Author:      Vadim Zeitlin
+// Created:     2006-10-19
+// RCS-ID:      $Id$
+// Copyright:   (c) 2006 Vadim Zeitlin <vadim@wxwindows.org>
+// Licence:     wxWindows licence
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef _WX_GTK_PRIVATE_STRING_H_
+#define _WX_GTK_PRIVATE_STRING_H_
+
+// ----------------------------------------------------------------------------
+// Convenience class for g_freeing a gchar* on scope exit automatically
+// ----------------------------------------------------------------------------
+
+class wxGtkString
+{
+public:
+    explicit wxGtkString(gchar *s) : m_str(s) { }
+    ~wxGtkString() { g_free(m_str); }
+
+    const gchar *c_str() const { return m_str; }
+
+    operator gchar *() const { return m_str; }
+
+private:
+    gchar *m_str;
+
+    DECLARE_NO_COPY_CLASS(wxGtkString)
+};
+
+#endif // _WX_GTK_PRIVATE_STRING_H_
+