annotate DEPENDENCIES/generic/include/boost/xpressive/detail/utility/counted_base.hpp @ 133:4acb5d8d80b6 tip

Don't fail environmental check if README.md exists (but .txt and no-suffix don't)
author Chris Cannam
date Tue, 30 Jul 2019 12:25:44 +0100
parents 2665513ce2d3
children
rev   line source
Chris@16 1 //////////////////////////////////////////////////////////////////////////////
Chris@16 2 // (c) Copyright Andreas Huber Doenni 2002-2005, Eric Niebler 2006
Chris@16 3 // Distributed under the Boost Software License, Version 1.0. (See accompany-
Chris@16 4 // ing file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16 5 //////////////////////////////////////////////////////////////////////////////
Chris@16 6
Chris@16 7 #ifndef BOOST_XPRESSIVE_DETAIL_UTILITY_COUNTED_BASE_HPP_EAN_04_16_2006
Chris@16 8 #define BOOST_XPRESSIVE_DETAIL_UTILITY_COUNTED_BASE_HPP_EAN_04_16_2006
Chris@16 9
Chris@16 10 #include <boost/assert.hpp>
Chris@16 11 #include <boost/checked_delete.hpp>
Chris@16 12 #include <boost/detail/atomic_count.hpp>
Chris@16 13
Chris@16 14 namespace boost { namespace xpressive { namespace detail
Chris@16 15 {
Chris@16 16 template<typename Derived>
Chris@16 17 struct counted_base_access;
Chris@16 18
Chris@16 19 //////////////////////////////////////////////////////////////////////////////
Chris@16 20 // counted_base
Chris@16 21 template<typename Derived>
Chris@16 22 struct counted_base
Chris@16 23 {
Chris@16 24 long use_count() const
Chris@16 25 {
Chris@16 26 return this->count_;
Chris@16 27 }
Chris@16 28
Chris@16 29 protected:
Chris@16 30 counted_base()
Chris@16 31 : count_(0)
Chris@16 32 {
Chris@16 33 }
Chris@16 34
Chris@16 35 counted_base(counted_base<Derived> const &)
Chris@16 36 : count_(0)
Chris@16 37 {
Chris@16 38 }
Chris@16 39
Chris@16 40 counted_base &operator =(counted_base<Derived> const &)
Chris@16 41 {
Chris@16 42 return *this;
Chris@16 43 }
Chris@16 44
Chris@16 45 private:
Chris@16 46 friend struct counted_base_access<Derived>;
Chris@16 47 mutable boost::detail::atomic_count count_;
Chris@16 48 };
Chris@16 49
Chris@16 50 //////////////////////////////////////////////////////////////////////////////
Chris@16 51 // counted_base_access
Chris@16 52 template<typename Derived>
Chris@16 53 struct counted_base_access
Chris@16 54 {
Chris@16 55 static void add_ref(counted_base<Derived> const *that)
Chris@16 56 {
Chris@16 57 ++that->count_;
Chris@16 58 }
Chris@16 59
Chris@16 60 static void release(counted_base<Derived> const *that)
Chris@16 61 {
Chris@16 62 BOOST_ASSERT(0 < that->count_);
Chris@16 63 if(0 == --that->count_)
Chris@16 64 {
Chris@16 65 boost::checked_delete(static_cast<Derived const *>(that));
Chris@16 66 }
Chris@16 67 }
Chris@16 68 };
Chris@16 69
Chris@16 70 template<typename Derived>
Chris@16 71 inline void intrusive_ptr_add_ref(counted_base<Derived> const *that)
Chris@16 72 {
Chris@16 73 counted_base_access<Derived>::add_ref(that);
Chris@16 74 }
Chris@16 75
Chris@16 76 template<typename Derived>
Chris@16 77 inline void intrusive_ptr_release(counted_base<Derived> const *that)
Chris@16 78 {
Chris@16 79 counted_base_access<Derived>::release(that);
Chris@16 80 }
Chris@16 81
Chris@16 82 }}} // namespace boost::xpressive::detail
Chris@16 83
Chris@16 84 #endif