[29] | 1 | #ifndef BOOST_DETAIL_SHARED_COUNT_HPP_INCLUDED |
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| 2 | #define BOOST_DETAIL_SHARED_COUNT_HPP_INCLUDED |
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| 3 | |
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| 4 | // MS compatible compilers support #pragma once |
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| 5 | |
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| 6 | #if defined(_MSC_VER) && (_MSC_VER >= 1020) |
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| 7 | # pragma once |
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| 8 | #endif |
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| 9 | |
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| 10 | // |
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| 11 | // detail/shared_count.hpp |
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| 12 | // |
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| 13 | // Copyright (c) 2001, 2002, 2003 Peter Dimov and Multi Media Ltd. |
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| 14 | // Copyright 2004-2005 Peter Dimov |
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| 15 | // |
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| 16 | // Distributed under the Boost Software License, Version 1.0. (See |
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| 17 | // accompanying file LICENSE_1_0.txt or copy at |
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| 18 | // http://www.boost.org/LICENSE_1_0.txt) |
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| 19 | // |
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| 20 | |
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| 21 | #ifdef __BORLANDC__ |
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| 22 | # pragma warn -8027 // Functions containing try are not expanded inline |
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| 23 | #endif |
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| 24 | |
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| 25 | #include <boost/config.hpp> |
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| 26 | #include <boost/checked_delete.hpp> |
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| 27 | #include <boost/throw_exception.hpp> |
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| 28 | #include <boost/detail/bad_weak_ptr.hpp> |
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| 29 | #include <boost/detail/sp_counted_base.hpp> |
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| 30 | #include <boost/detail/sp_counted_impl.hpp> |
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| 31 | |
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| 32 | #include <memory> // std::auto_ptr |
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| 33 | #include <functional> // std::less |
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| 34 | #include <new> // std::bad_alloc |
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| 35 | #include <typeinfo> // std::type_info in get_deleter |
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| 36 | |
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| 37 | namespace boost |
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| 38 | { |
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| 39 | |
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| 40 | namespace detail |
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| 41 | { |
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| 42 | |
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| 43 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS) |
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| 44 | |
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| 45 | int const shared_count_id = 0x2C35F101; |
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| 46 | int const weak_count_id = 0x298C38A4; |
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| 47 | |
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| 48 | #endif |
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| 49 | |
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| 50 | class weak_count; |
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| 51 | |
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| 52 | class shared_count |
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| 53 | { |
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| 54 | private: |
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| 55 | |
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| 56 | sp_counted_base * pi_; |
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| 57 | |
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| 58 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS) |
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| 59 | int id_; |
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| 60 | #endif |
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| 61 | |
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| 62 | friend class weak_count; |
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| 63 | |
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| 64 | public: |
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| 65 | |
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| 66 | shared_count(): pi_(0) // nothrow |
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| 67 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS) |
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| 68 | , id_(shared_count_id) |
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| 69 | #endif |
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| 70 | { |
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| 71 | } |
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| 72 | |
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| 73 | template<class Y> explicit shared_count( Y * p ): pi_( 0 ) |
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| 74 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS) |
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| 75 | , id_(shared_count_id) |
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| 76 | #endif |
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| 77 | { |
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| 78 | #ifndef BOOST_NO_EXCEPTIONS |
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| 79 | |
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| 80 | try |
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| 81 | { |
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| 82 | pi_ = new sp_counted_impl_p<Y>( p ); |
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| 83 | } |
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| 84 | catch(...) |
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| 85 | { |
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| 86 | boost::checked_delete( p ); |
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| 87 | throw; |
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| 88 | } |
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| 89 | |
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| 90 | #else |
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| 91 | |
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| 92 | pi_ = new sp_counted_impl_p<Y>( p ); |
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| 93 | |
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| 94 | if( pi_ == 0 ) |
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| 95 | { |
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| 96 | boost::checked_delete( p ); |
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| 97 | boost::throw_exception( std::bad_alloc() ); |
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| 98 | } |
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| 99 | |
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| 100 | #endif |
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| 101 | } |
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| 102 | |
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| 103 | template<class P, class D> shared_count(P p, D d): pi_(0) |
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| 104 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS) |
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| 105 | , id_(shared_count_id) |
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| 106 | #endif |
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| 107 | { |
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| 108 | #ifndef BOOST_NO_EXCEPTIONS |
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| 109 | |
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| 110 | try |
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| 111 | { |
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| 112 | pi_ = new sp_counted_impl_pd<P, D>(p, d); |
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| 113 | } |
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| 114 | catch(...) |
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| 115 | { |
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| 116 | d(p); // delete p |
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| 117 | throw; |
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| 118 | } |
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| 119 | |
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| 120 | #else |
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| 121 | |
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| 122 | pi_ = new sp_counted_impl_pd<P, D>(p, d); |
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| 123 | |
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| 124 | if(pi_ == 0) |
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| 125 | { |
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| 126 | d(p); // delete p |
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| 127 | boost::throw_exception(std::bad_alloc()); |
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| 128 | } |
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| 129 | |
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| 130 | #endif |
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| 131 | } |
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| 132 | |
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| 133 | template<class P, class D, class A> shared_count( P p, D d, A a ): pi_( 0 ) |
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| 134 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS) |
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| 135 | , id_(shared_count_id) |
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| 136 | #endif |
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| 137 | { |
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| 138 | typedef sp_counted_impl_pda<P, D, A> impl_type; |
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| 139 | typedef typename A::template rebind< impl_type >::other A2; |
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| 140 | |
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| 141 | A2 a2( a ); |
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| 142 | |
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| 143 | #ifndef BOOST_NO_EXCEPTIONS |
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| 144 | |
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| 145 | try |
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| 146 | { |
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| 147 | pi_ = a2.allocate( 1, static_cast< impl_type* >( 0 ) ); |
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| 148 | new( static_cast< void* >( pi_ ) ) impl_type( p, d, a ); |
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| 149 | } |
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| 150 | catch(...) |
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| 151 | { |
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| 152 | d( p ); |
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| 153 | |
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| 154 | if( pi_ != 0 ) |
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| 155 | { |
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| 156 | a2.deallocate( static_cast< impl_type* >( pi_ ), 1 ); |
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| 157 | } |
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| 158 | |
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| 159 | throw; |
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| 160 | } |
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| 161 | |
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| 162 | #else |
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| 163 | |
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| 164 | pi_ = a2.allocate( 1, static_cast< impl_type* >( 0 ) ); |
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| 165 | |
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| 166 | if( pi_ != 0 ) |
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| 167 | { |
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| 168 | new( static_cast< void* >( pi_ ) ) impl_type( p, d, a ); |
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| 169 | } |
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| 170 | else |
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| 171 | { |
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| 172 | d( p ); |
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| 173 | boost::throw_exception( std::bad_alloc() ); |
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| 174 | } |
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| 175 | |
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| 176 | #endif |
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| 177 | } |
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| 178 | |
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| 179 | #ifndef BOOST_NO_AUTO_PTR |
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| 180 | |
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| 181 | // auto_ptr<Y> is special cased to provide the strong guarantee |
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| 182 | |
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| 183 | template<class Y> |
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| 184 | explicit shared_count( std::auto_ptr<Y> & r ): pi_( new sp_counted_impl_p<Y>( r.get() ) ) |
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| 185 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS) |
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| 186 | , id_(shared_count_id) |
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| 187 | #endif |
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| 188 | { |
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| 189 | #ifdef BOOST_NO_EXCEPTIONS |
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| 190 | |
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| 191 | if( pi_ == 0 ) |
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| 192 | { |
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| 193 | boost::throw_exception(std::bad_alloc()); |
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| 194 | } |
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| 195 | |
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| 196 | #endif |
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| 197 | |
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| 198 | r.release(); |
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| 199 | } |
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| 200 | |
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| 201 | #endif |
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| 202 | |
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| 203 | ~shared_count() // nothrow |
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| 204 | { |
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| 205 | if( pi_ != 0 ) pi_->release(); |
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| 206 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS) |
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| 207 | id_ = 0; |
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| 208 | #endif |
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| 209 | } |
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| 210 | |
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| 211 | shared_count(shared_count const & r): pi_(r.pi_) // nothrow |
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| 212 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS) |
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| 213 | , id_(shared_count_id) |
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| 214 | #endif |
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| 215 | { |
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| 216 | if( pi_ != 0 ) pi_->add_ref_copy(); |
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| 217 | } |
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| 218 | |
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| 219 | explicit shared_count(weak_count const & r); // throws bad_weak_ptr when r.use_count() == 0 |
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| 220 | |
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| 221 | shared_count & operator= (shared_count const & r) // nothrow |
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| 222 | { |
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| 223 | sp_counted_base * tmp = r.pi_; |
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| 224 | |
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| 225 | if( tmp != pi_ ) |
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| 226 | { |
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| 227 | if( tmp != 0 ) tmp->add_ref_copy(); |
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| 228 | if( pi_ != 0 ) pi_->release(); |
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| 229 | pi_ = tmp; |
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| 230 | } |
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| 231 | |
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| 232 | return *this; |
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| 233 | } |
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| 234 | |
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| 235 | void swap(shared_count & r) // nothrow |
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| 236 | { |
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| 237 | sp_counted_base * tmp = r.pi_; |
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| 238 | r.pi_ = pi_; |
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| 239 | pi_ = tmp; |
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| 240 | } |
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| 241 | |
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| 242 | long use_count() const // nothrow |
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| 243 | { |
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| 244 | return pi_ != 0? pi_->use_count(): 0; |
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| 245 | } |
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| 246 | |
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| 247 | bool unique() const // nothrow |
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| 248 | { |
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| 249 | return use_count() == 1; |
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| 250 | } |
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| 251 | |
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| 252 | friend inline bool operator==(shared_count const & a, shared_count const & b) |
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| 253 | { |
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| 254 | return a.pi_ == b.pi_; |
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| 255 | } |
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| 256 | |
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| 257 | friend inline bool operator<(shared_count const & a, shared_count const & b) |
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| 258 | { |
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| 259 | return std::less<sp_counted_base *>()( a.pi_, b.pi_ ); |
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| 260 | } |
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| 261 | |
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| 262 | void * get_deleter(std::type_info const & ti) const |
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| 263 | { |
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| 264 | return pi_? pi_->get_deleter( ti ): 0; |
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| 265 | } |
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| 266 | }; |
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| 267 | |
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| 268 | |
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| 269 | class weak_count |
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| 270 | { |
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| 271 | private: |
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| 272 | |
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| 273 | sp_counted_base * pi_; |
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| 274 | |
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| 275 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS) |
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| 276 | int id_; |
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| 277 | #endif |
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| 278 | |
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| 279 | friend class shared_count; |
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| 280 | |
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| 281 | public: |
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| 282 | |
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| 283 | weak_count(): pi_(0) // nothrow |
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| 284 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS) |
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| 285 | , id_(weak_count_id) |
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| 286 | #endif |
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| 287 | { |
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| 288 | } |
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| 289 | |
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| 290 | weak_count(shared_count const & r): pi_(r.pi_) // nothrow |
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| 291 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS) |
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| 292 | , id_(shared_count_id) |
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| 293 | #endif |
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| 294 | { |
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| 295 | if(pi_ != 0) pi_->weak_add_ref(); |
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| 296 | } |
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| 297 | |
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| 298 | weak_count(weak_count const & r): pi_(r.pi_) // nothrow |
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| 299 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS) |
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| 300 | , id_(shared_count_id) |
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| 301 | #endif |
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| 302 | { |
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| 303 | if(pi_ != 0) pi_->weak_add_ref(); |
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| 304 | } |
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| 305 | |
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| 306 | ~weak_count() // nothrow |
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| 307 | { |
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| 308 | if(pi_ != 0) pi_->weak_release(); |
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| 309 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS) |
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| 310 | id_ = 0; |
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| 311 | #endif |
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| 312 | } |
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| 313 | |
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| 314 | weak_count & operator= (shared_count const & r) // nothrow |
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| 315 | { |
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| 316 | sp_counted_base * tmp = r.pi_; |
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| 317 | if(tmp != 0) tmp->weak_add_ref(); |
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| 318 | if(pi_ != 0) pi_->weak_release(); |
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| 319 | pi_ = tmp; |
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| 320 | |
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| 321 | return *this; |
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| 322 | } |
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| 323 | |
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| 324 | weak_count & operator= (weak_count const & r) // nothrow |
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| 325 | { |
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| 326 | sp_counted_base * tmp = r.pi_; |
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| 327 | if(tmp != 0) tmp->weak_add_ref(); |
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| 328 | if(pi_ != 0) pi_->weak_release(); |
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| 329 | pi_ = tmp; |
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| 330 | |
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| 331 | return *this; |
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| 332 | } |
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| 333 | |
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| 334 | void swap(weak_count & r) // nothrow |
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| 335 | { |
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| 336 | sp_counted_base * tmp = r.pi_; |
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| 337 | r.pi_ = pi_; |
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| 338 | pi_ = tmp; |
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| 339 | } |
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| 340 | |
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| 341 | long use_count() const // nothrow |
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| 342 | { |
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| 343 | return pi_ != 0? pi_->use_count(): 0; |
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| 344 | } |
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| 345 | |
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| 346 | friend inline bool operator==(weak_count const & a, weak_count const & b) |
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| 347 | { |
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| 348 | return a.pi_ == b.pi_; |
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| 349 | } |
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| 350 | |
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| 351 | friend inline bool operator<(weak_count const & a, weak_count const & b) |
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| 352 | { |
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| 353 | return std::less<sp_counted_base *>()(a.pi_, b.pi_); |
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| 354 | } |
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| 355 | }; |
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| 356 | |
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| 357 | inline shared_count::shared_count( weak_count const & r ): pi_( r.pi_ ) |
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| 358 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS) |
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| 359 | , id_(shared_count_id) |
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| 360 | #endif |
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| 361 | { |
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| 362 | if( pi_ == 0 || !pi_->add_ref_lock() ) |
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| 363 | { |
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| 364 | boost::throw_exception( boost::bad_weak_ptr() ); |
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| 365 | } |
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| 366 | } |
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| 367 | |
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| 368 | } // namespace detail |
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| 369 | |
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| 370 | } // namespace boost |
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| 371 | |
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| 372 | #ifdef __BORLANDC__ |
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| 373 | # pragma warn .8027 // Functions containing try are not expanded inline |
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| 374 | #endif |
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| 375 | |
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| 376 | #endif // #ifndef BOOST_DETAIL_SHARED_COUNT_HPP_INCLUDED |
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