Update boost to 1.71 and add asio

boost/smart_ptr/detail/atomic_count_spin.hpp

@@ -0,0 +1,62 @@
+#ifndef BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_SPIN_HPP_INCLUDED
+#define BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_SPIN_HPP_INCLUDED
+
+//
+//  boost/detail/atomic_count_spin.hpp
+//
+//  Copyright (c) 2013 Peter Dimov
+//
+//  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
+//
+
+#include <boost/smart_ptr/detail/spinlock_pool.hpp>
+
+namespace boost
+{
+
+namespace detail
+{
+
+class atomic_count
+{
+private:
+
+public:
+
+    explicit atomic_count( long v ): value_( v )
+    {
+    }
+
+    long operator++()
+    {
+        spinlock_pool<0>::scoped_lock lock( &value_ );
+        return ++value_;
+    }
+
+    long operator--()
+    {
+        spinlock_pool<0>::scoped_lock lock( &value_ );
+        return --value_;
+    }
+
+    operator long() const
+    {
+        spinlock_pool<0>::scoped_lock lock( &value_ );
+        return value_;
+    }
+
+private:
+
+    atomic_count(atomic_count const &);
+    atomic_count & operator=(atomic_count const &);
+
+    long value_;
+};
+
+} // namespace detail
+
+} // namespace boost
+
+#endif // #ifndef BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_SPIN_HPP_INCLUDED