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