1 // Copyright (C) 2001-2003

     2 // Mac Murrett

     3 //

     4 // Distributed under the Boost Software License, Version 1.0. (See

     5 // accompanying file LICENSE_1_0.txt or copy at

     6 // http://www.boost.org/LICENSE_1_0.txt)

     7 //

     8 // See http://www.boost.org for most recent version including documentation.

     9 

    10 #ifndef BOOST_SINGLETON_MJM012402_HPP

    11 #define BOOST_SINGLETON_MJM012402_HPP

    12 

    13 #include <boost/thread/detail/config.hpp>

    14 

    15 namespace boost {

    16 namespace detail {

    17 namespace thread {

    18 

    19 // class singleton has the same goal as all singletons: create one instance of

    20 // a class on demand, then dish it out as requested.

    21 

    22 template <class T>

    23 class singleton : private T

    24 {

    25 private:

    26     singleton();

    27     ~singleton();

    28 

    29 public:

    30     static T &instance();

    31 };

    32 

    33 

    34 template <class T>

    35 inline singleton<T>::singleton()

    36 {

    37     /* no-op */

    38 }

    39 

    40 template <class T>

    41 inline singleton<T>::~singleton()

    42 {

    43     /* no-op */

    44 }

    45 

    46 template <class T>

    47 /*static*/ T &singleton<T>::instance()

    48 {

    49     // function-local static to force this to work correctly at static

    50     // initialization time.

    51     static singleton<T> s_oT;

    52     return(s_oT);

    53 }

    54 

    55 } // namespace thread

    56 } // namespace detail

    57 } // namespace boost

    58 

    59 #endif // BOOST_SINGLETON_MJM012402_HPP