comparison DEPENDENCIES/generic/include/boost/statechart/detail/counted_base.hpp @ 16:2665513ce2d3

Add boost headers

+#ifndef BOOST_STATECHART_DETAIL_COUNTED_BASE_HPP_INCLUDED
+#define BOOST_STATECHART_DETAIL_COUNTED_BASE_HPP_INCLUDED
+//////////////////////////////////////////////////////////////////////////////
+// Copyright 2002-2006 Andreas Huber Doenni
+// 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)
+//////////////////////////////////////////////////////////////////////////////
+
+
+
+#include <boost/detail/atomic_count.hpp>
+#include <boost/config.hpp> // BOOST_NO_ARGUMENT_DEPENDENT_LOOKUP
+
+
+
+namespace boost
+{
+namespace statechart
+{
+namespace detail
+{
+
+
+  
+template< bool NeedsLocking >
+struct count_base
+{
+  count_base() : count_( 0 ) {}
+  mutable boost::detail::atomic_count count_;
+};
+
+template<>
+struct count_base< false >
+{
+  count_base() : count_( 0 ) {}
+  mutable long count_;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+template< bool NeedsLocking = true >
+class counted_base : private count_base< NeedsLocking >
+{
+  typedef count_base< NeedsLocking > base_type;
+  public:
+    //////////////////////////////////////////////////////////////////////////
+    bool ref_counted() const
+    {
+      return base_type::count_ != 0;
+    }
+
+    long ref_count() const
+    {
+      return base_type::count_;
+    }
+
+  protected:
+    //////////////////////////////////////////////////////////////////////////
+    counted_base() {}
+    ~counted_base() {}
+
+    // do nothing copy implementation is intentional (the number of
+    // referencing pointers of the source and the destination is not changed
+    // through the copy operation)
+    counted_base( const counted_base & ) : base_type() {}
+    counted_base & operator=( const counted_base & ) { return *this; }
+
+  public:
+    //////////////////////////////////////////////////////////////////////////
+    // The following declarations should be private.
+    // They are only public because many compilers lack template friends.
+    //////////////////////////////////////////////////////////////////////////
+    void add_ref() const
+    {
+      ++base_type::count_;
+    }
+
+    bool release() const
+    {
+      BOOST_ASSERT( base_type::count_ > 0 );
+      return --base_type::count_ == 0;
+    }
+};
+
+
+
+} // namespace detail
+} // namespace statechart
+} // namespace boost
+
+
+
+#endif