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60 lines
1.2 KiB
C++
60 lines
1.2 KiB
C++
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// Copyright (C) 2001-2003
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// Mac Murrett
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//
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// See http://www.boost.org for most recent version including documentation.
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#ifndef BOOST_SINGLETON_MJM012402_HPP
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#define BOOST_SINGLETON_MJM012402_HPP
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#include <boost/thread/detail/config.hpp>
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namespace boost {
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namespace detail {
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namespace thread {
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// class singleton has the same goal as all singletons: create one instance of
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// a class on demand, then dish it out as requested.
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template <class T>
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class singleton : private T
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{
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private:
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singleton();
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~singleton();
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public:
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static T &instance();
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};
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template <class T>
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inline singleton<T>::singleton()
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{
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/* no-op */
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}
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template <class T>
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inline singleton<T>::~singleton()
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{
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/* no-op */
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}
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template <class T>
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/*static*/ T &singleton<T>::instance()
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{
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// function-local static to force this to work correctly at static
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// initialization time.
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static singleton<T> s_oT;
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return(s_oT);
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}
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} // namespace thread
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} // namespace detail
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} // namespace boost
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#endif // BOOST_SINGLETON_MJM012402_HPP
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