From b51965dddbed68f23c5e8c169c23c794313ce5f6 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 28 Jun 2011 17:17:23 +0200
Subject: Add boost subset as an implementation detail

---
 .../boost/smart_ptr/detail/atomic_count_sync.hpp   | 61 ++++++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100644 cutl/details/boost/smart_ptr/detail/atomic_count_sync.hpp

(limited to 'cutl/details/boost/smart_ptr/detail/atomic_count_sync.hpp')

diff --git a/cutl/details/boost/smart_ptr/detail/atomic_count_sync.hpp b/cutl/details/boost/smart_ptr/detail/atomic_count_sync.hpp
new file mode 100644
index 0000000..3be0447
--- /dev/null
+++ b/cutl/details/boost/smart_ptr/detail/atomic_count_sync.hpp
@@ -0,0 +1,61 @@
+#ifndef BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_SYNC_HPP_INCLUDED
+#define BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_SYNC_HPP_INCLUDED
+
+//
+//  boost/detail/atomic_count_sync.hpp
+//
+//  atomic_count for g++ 4.1+
+//
+//  http://gcc.gnu.org/onlinedocs/gcc-4.1.1/gcc/Atomic-Builtins.html
+//
+//  Copyright 2007 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)
+//
+
+#if defined( __ia64__ ) && defined( __INTEL_COMPILER )
+# include <ia64intrin.h>
+#endif
+
+namespace cutl_details_boost
+{
+
+namespace detail
+{
+
+class atomic_count
+{
+public:
+
+    explicit atomic_count( long v ) : value_( v ) {}
+
+    long operator++()
+    {
+        return __sync_add_and_fetch( &value_, 1 );
+    }
+
+    long operator--()
+    {
+        return __sync_add_and_fetch( &value_, -1 );
+    }
+
+    operator long() const
+    {
+        return __sync_fetch_and_add( &value_, 0 );
+    }
+
+private:
+
+    atomic_count(atomic_count const &);
+    atomic_count & operator=(atomic_count const &);
+
+    mutable long value_;
+};
+
+} // namespace detail
+
+} // namespace cutl_details_boost
+
+#endif // #ifndef BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_SYNC_HPP_INCLUDED
-- 
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