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Diffstat (limited to '3rdParty/Boost/src/boost/spirit/home/support/iterators/detail/ref_counted_policy.hpp')
-rw-r--r-- | 3rdParty/Boost/src/boost/spirit/home/support/iterators/detail/ref_counted_policy.hpp | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/3rdParty/Boost/src/boost/spirit/home/support/iterators/detail/ref_counted_policy.hpp b/3rdParty/Boost/src/boost/spirit/home/support/iterators/detail/ref_counted_policy.hpp new file mode 100644 index 0000000..723bbee --- /dev/null +++ b/3rdParty/Boost/src/boost/spirit/home/support/iterators/detail/ref_counted_policy.hpp @@ -0,0 +1,79 @@ +// Copyright (c) 2001 Daniel C. Nuffer +// Copyright (c) 2001-2011 Hartmut Kaiser +// +// 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(BOOST_SPIRIT_ITERATOR_REF_COUNTED_POLICY_MAR_16_2007_1108AM) +#define BOOST_SPIRIT_ITERATOR_REF_COUNTED_POLICY_MAR_16_2007_1108AM + +#include <boost/spirit/home/support/iterators/multi_pass_fwd.hpp> +#include <boost/spirit/home/support/iterators/detail/multi_pass.hpp> +#if defined(BOOST_HAS_THREADS) +#include <boost/detail/atomic_count.hpp> +#endif +#include <cstdlib> + +namespace boost { namespace spirit { namespace iterator_policies +{ + /////////////////////////////////////////////////////////////////////////// + // class ref_counted + // Implementation of an OwnershipPolicy used by multi_pass. + // + // Implementation modified from RefCounted class from the Loki library by + // Andrei Alexandrescu. + /////////////////////////////////////////////////////////////////////////// + struct ref_counted + { + /////////////////////////////////////////////////////////////////////// + struct unique // : detail::default_ownership_policy + { + void swap(unique&) {} + + // clone is called when a copy of the iterator is made, so + // increment the ref-count. + template <typename MultiPass> + static void clone(MultiPass& mp) + { + if (0 != mp.shared()) + ++mp.shared()->count; + } + + // called when a copy is deleted. Decrement the ref-count. Return + // value of true indicates that the last copy has been released. + template <typename MultiPass> + static bool release(MultiPass& mp) + { + return 0 != mp.shared() && 0 == --mp.shared()->count; + } + + // returns true if there is only one iterator in existence. + // std_deque StoragePolicy will free it's buffered data if this + // returns true. + template <typename MultiPass> + static bool is_unique(MultiPass const& mp) + { + return 0 == mp.shared() || 1 == mp.shared()->count; + } + + template <typename MultiPass> + static void destroy(MultiPass&) {} + }; + + //////////////////////////////////////////////////////////////////////// + struct shared + { + shared() : count(1) {} + +#if defined(BOOST_HAS_THREADS) + boost::detail::atomic_count count; +#else + std::size_t count; +#endif + }; + + }; + +}}} + +#endif |