src/frontends/Dialogs.C

   1 /**
   2  * \file Dialogs.C
   3  * Copyright 1995-2002 The LyX Team.
   4  * See the file COPYING.
   5  * \author Angus Leeming <leeming@lyx.org>
   6  *
   7  * Common to all frontends' Dialogs
   8  */
   9
  10 #include <config.h>
  11
  12 #ifdef __GNUG__
  13 #pragma implementation
  14 #endif
  15
  16 #include "Dialogs.h"
  17
  18 // Note that static boost signals break some compilers, so this wrapper
  19 // initialises the signal dynamically when it is first invoked.
  20 template<typename Signal>
  21 class BugfixSignal {
  22 public:
  23         Signal & operator()() { return thesignal(); }
  24         Signal const & operator()() const { return thesignal(); }
  25
  26 private:
  27         Signal & thesignal() const
  28         {
  29                 if (!signal_.get())
  30                         signal_.reset(new Signal);
  31                 return *signal_;
  32         }
  33
  34         mutable boost::scoped_ptr<Signal> signal_;
  35 };
  36
  37
  38 boost::signal0<void> & Dialogs::redrawGUI()
  39 {
  40         static BugfixSignal<boost::signal0<void> > thesignal;
  41         return thesignal();
  42 }