Added boost header

test/external/boost/xpressive/detail/utility/counted_base.hpp

@@ -0,0 +1,84 @@
+//////////////////////////////////////////////////////////////////////////////
+// (c) Copyright Andreas Huber Doenni 2002-2005, Eric Niebler 2006
+// Distributed under the Boost Software License, Version 1.0. (See accompany-
+// ing file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//////////////////////////////////////////////////////////////////////////////
+
+#ifndef BOOST_XPRESSIVE_DETAIL_UTILITY_COUNTED_BASE_HPP_EAN_04_16_2006
+#define BOOST_XPRESSIVE_DETAIL_UTILITY_COUNTED_BASE_HPP_EAN_04_16_2006
+
+#include <boost/assert.hpp>
+#include <boost/checked_delete.hpp>
+#include <boost/detail/atomic_count.hpp>
+
+namespace boost { namespace xpressive { namespace detail
+{
+    template<typename Derived>
+    struct counted_base_access;
+
+    //////////////////////////////////////////////////////////////////////////////
+    // counted_base
+    template<typename Derived>
+    struct counted_base
+    {
+        long use_count() const
+        {
+            return this->count_;
+        }
+
+    protected:
+        counted_base()
+          : count_(0)
+        {
+        }
+
+        counted_base(counted_base<Derived> const &)
+          : count_(0)
+        {
+        }
+
+        counted_base &operator =(counted_base<Derived> const &)
+        {
+            return *this;
+        }
+
+    private:
+        friend struct counted_base_access<Derived>;
+        mutable boost::detail::atomic_count count_;
+    };
+
+    //////////////////////////////////////////////////////////////////////////////
+    // counted_base_access
+    template<typename Derived>
+    struct counted_base_access
+    {
+        static void add_ref(counted_base<Derived> const *that)
+        {
+            ++that->count_;
+        }
+
+        static void release(counted_base<Derived> const *that)
+        {
+            BOOST_ASSERT(0 < that->count_);
+            if(0 == --that->count_)
+            {
+                boost::checked_delete(static_cast<Derived const *>(that));
+            }
+        }
+    };
+
+    template<typename Derived>
+    inline void intrusive_ptr_add_ref(counted_base<Derived> const *that)
+    {
+        counted_base_access<Derived>::add_ref(that);
+    }
+
+    template<typename Derived>
+    inline void intrusive_ptr_release(counted_base<Derived> const *that)
+    {
+        counted_base_access<Derived>::release(that);
+    }
+
+}}} // namespace boost::xpressive::detail
+
+#endif