boost/test/utils/trivial_singleton.hpp

//  (C) Copyright Gennadiy Rozental 2001.
//  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        : $RCSfile$
//
//  Version     : $Revision$
//
//  Description : simple helpers for creating cusom output manipulators
// ***************************************************************************
#ifndef BOOST_TEST_UTILS_TRIVIAL_SIGNLETON_HPP
#define BOOST_TEST_UTILS_TRIVIAL_SIGNLETON_HPP
// Boost.Test
#include <boost/config.hpp>
#include <boost/detail/workaround.hpp>
// Boost
#include <boost/test/detail/suppress_warnings.hpp>
//____________________________________________________________________________//
namespace boost {
namespace unit_test {
// ************************************************************************** //
// **************                   singleton                  ************** //
// ************************************************************************** //
template<typename Derived>
class singleton {
public:
    static Derived& instance() { static Derived the_inst; return the_inst; }
    BOOST_DELETED_FUNCTION(singleton(singleton const&))
    BOOST_DELETED_FUNCTION(singleton& operator=(singleton const&))
protected:
    BOOST_DEFAULTED_FUNCTION(singleton(), {})
    BOOST_DEFAULTED_FUNCTION(~singleton(), {})
};
//____________________________________________________________________________//
#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 unit_test
} // namespace boost
#include <boost/test/detail/enable_warnings.hpp>
#endif // BOOST_TEST_UTILS_TRIVIAL_SIGNLETON_HPP