//  (C) Copyright Gennadiy Rozental 2005-2008.
//  Distributed under the Boost Software License, Version 1.0.
//  (See accompanying file LICENSE_1_0.txt or copy at 
//  http://www.boost.org/LICENSE_1_0.txt)

//  See http://www.boost.org/libs/test for the library home page.
//
//  File        : $RCSfile: trivial_singleton.hpp,v $
//
//  Version     : $Revision: 1.2 $
//
//  Description : simple helpers for creating cusom output manipulators
// ***************************************************************************

#ifndef BOOST_TEST_TRIVIAL_SIGNLETON_HPP_020505GER
#define BOOST_TEST_TRIVIAL_SIGNLETON_HPP_020505GER

#include <boost/config.hpp>
#include <boost/detail/workaround.hpp>

#include <boost/noncopyable.hpp>

#include <boost/test/detail/suppress_warnings.hpp>

//____________________________________________________________________________//

namespace boost {

namespace unit_test {

// ************************************************************************** //
// **************                   singleton                  ************** //
// ************************************************************************** //

template<typename Derived>
class singleton : private boost::noncopyable {
public:
    static Derived& instance() { static Derived the_inst; return the_inst; }    
protected:
    singleton()  {}
    ~singleton() {}
};

} // namespace unit_test

#define BOOST_TEST_SINGLETON_CONS( type )       \
friend class boost::unit_test::singleton<type>; \
type() {}                                       \
/**/

#if BOOST_WORKAROUND(__DECCXX_VER, BOOST_TESTED_AT(60590042))

#define BOOST_TEST_SINGLETON_INST( inst ) \
template class unit_test::singleton< BOOST_JOIN( inst, _t ) > ; \
namespace { BOOST_JOIN( inst, _t)& inst = BOOST_JOIN( inst, _t)::instance(); }

#elif defined(__APPLE_CC__) && defined(__GNUC__) && __GNUC__ < 4
#define BOOST_TEST_SINGLETON_INST( inst ) \
static BOOST_JOIN( inst, _t)& inst = BOOST_JOIN (inst, _t)::instance();

#else

#define BOOST_TEST_SINGLETON_INST( inst ) \
namespace { BOOST_JOIN( inst, _t)& inst = BOOST_JOIN( inst, _t)::instance(); }

#endif

} // namespace boost

//____________________________________________________________________________//

#include <boost/test/detail/enable_warnings.hpp>

#endif // BOOST_TEST_TRIVIAL_SIGNLETON_HPP_020505GER
