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+//
+// detail/tss_ptr.hpp
+// ~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2012 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// 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)
+//
+
+#ifndef BOOST_ASIO_DETAIL_TSS_PTR_HPP
+#define BOOST_ASIO_DETAIL_TSS_PTR_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/config.hpp>
+
+#if !defined(BOOST_HAS_THREADS) || defined(BOOST_ASIO_DISABLE_THREADS)
+# include <boost/asio/detail/null_tss_ptr.hpp>
+#elif defined(BOOST_WINDOWS)
+# include <boost/asio/detail/win_tss_ptr.hpp>
+#elif defined(BOOST_HAS_PTHREADS)
+# include <boost/asio/detail/posix_tss_ptr.hpp>
+#else
+# error Only Windows and POSIX are supported!
+#endif
+
+#include <boost/asio/detail/push_options.hpp>
+
+namespace boost {
+namespace asio {
+namespace detail {
+
+template <typename T>
+class tss_ptr
+#if !defined(BOOST_HAS_THREADS) || defined(BOOST_ASIO_DISABLE_THREADS)
+ : public null_tss_ptr<T>
+#elif defined(BOOST_WINDOWS)
+ : public win_tss_ptr<T>
+#elif defined(BOOST_HAS_PTHREADS)
+ : public posix_tss_ptr<T>
+#endif
+{
+public:
+ void operator=(T* value)
+ {
+#if !defined(BOOST_HAS_THREADS) || defined(BOOST_ASIO_DISABLE_THREADS)
+ null_tss_ptr<T>::operator=(value);
+#elif defined(BOOST_WINDOWS)
+ win_tss_ptr<T>::operator=(value);
+#elif defined(BOOST_HAS_PTHREADS)
+ posix_tss_ptr<T>::operator=(value);
+#endif
+ }
+};
+
+} // namespace detail
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // BOOST_ASIO_DETAIL_TSS_PTR_HPP