lyx_mirror/src/frontends/Dialogs.C

/**
 * \file frontends/Dialogs.C
 * This file is part of LyX, the document processor.
 * Licence details can be found in the file COPYING.
 * \author Angus Leeming
 *
 * Full author contact details are available in file CREDITS
 *
 * Common to all frontends' Dialogs
 */

#include <config.h>

#ifdef __GNUG__
#pragma implementation
#endif

#include "Dialogs.h"

// Note that static boost signals break some compilers, so this wrapper
// initialises the signal dynamically when it is first invoked.
template<typename Signal>
class BugfixSignal {
public:
	Signal & operator()() { return thesignal(); }
	Signal const & operator()() const { return thesignal(); }

private:
	Signal & thesignal() const
	{
		if (!signal_.get())
			signal_.reset(new Signal);
		return *signal_;
	}

	mutable boost::scoped_ptr<Signal> signal_;
};


boost::signal0<void> & Dialogs::redrawGUI()
{
	static BugfixSignal<boost::signal0<void> > thesignal;
	return thesignal();
}