[3428] | 1 | #ifndef BOOST_SMART_PTR_DETAIL_SHARED_COUNT_HPP_INCLUDED |
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| 2 | #define BOOST_SMART_PTR_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/smart_ptr/bad_weak_ptr.hpp> |
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| 29 | #include <boost/smart_ptr/detail/sp_counted_base.hpp> |
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| 30 | #include <boost/smart_ptr/detail/sp_counted_impl.hpp> |
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| 31 | #include <boost/detail/workaround.hpp> |
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| 32 | // In order to avoid circular dependencies with Boost.TR1 |
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| 33 | // we make sure that our include of <memory> doesn't try to |
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| 34 | // pull in the TR1 headers: that's why we use this header |
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| 35 | // rather than including <memory> directly: |
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| 36 | #include <boost/config/no_tr1/memory.hpp> // std::auto_ptr |
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| 37 | #include <functional> // std::less |
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| 38 | #include <new> // std::bad_alloc |
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| 39 | |
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| 40 | namespace boost |
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| 41 | { |
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| 42 | |
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| 43 | namespace detail |
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| 44 | { |
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| 45 | |
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| 46 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS) |
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| 47 | |
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| 48 | int const shared_count_id = 0x2C35F101; |
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| 49 | int const weak_count_id = 0x298C38A4; |
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| 50 | |
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| 51 | #endif |
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| 52 | |
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| 53 | struct sp_nothrow_tag {}; |
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| 54 | |
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| 55 | class weak_count; |
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| 56 | |
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| 57 | class shared_count |
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| 58 | { |
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| 59 | private: |
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| 60 | |
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| 61 | sp_counted_base * pi_; |
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| 62 | |
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| 63 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS) |
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| 64 | int id_; |
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| 65 | #endif |
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| 66 | |
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| 67 | friend class weak_count; |
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| 68 | |
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| 69 | public: |
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| 70 | |
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| 71 | shared_count(): pi_(0) // nothrow |
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| 72 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS) |
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| 73 | , id_(shared_count_id) |
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| 74 | #endif |
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| 75 | { |
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| 76 | } |
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| 77 | |
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| 78 | template<class Y> explicit shared_count( Y * p ): pi_( 0 ) |
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| 79 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS) |
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| 80 | , id_(shared_count_id) |
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| 81 | #endif |
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| 82 | { |
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| 83 | #ifndef BOOST_NO_EXCEPTIONS |
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| 84 | |
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| 85 | try |
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| 86 | { |
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| 87 | pi_ = new sp_counted_impl_p<Y>( p ); |
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| 88 | } |
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| 89 | catch(...) |
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| 90 | { |
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| 91 | boost::checked_delete( p ); |
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| 92 | throw; |
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| 93 | } |
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| 94 | |
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| 95 | #else |
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| 96 | |
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| 97 | pi_ = new sp_counted_impl_p<Y>( p ); |
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| 98 | |
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| 99 | if( pi_ == 0 ) |
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| 100 | { |
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| 101 | boost::checked_delete( p ); |
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| 102 | boost::throw_exception( std::bad_alloc() ); |
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| 103 | } |
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| 104 | |
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| 105 | #endif |
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| 106 | } |
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| 107 | |
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| 108 | #if defined( BOOST_MSVC ) && BOOST_WORKAROUND( BOOST_MSVC, <= 1200 ) |
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| 109 | template<class Y, class D> shared_count( Y * p, D d ): pi_(0) |
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| 110 | #else |
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| 111 | template<class P, class D> shared_count( P p, D d ): pi_(0) |
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| 112 | #endif |
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| 113 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS) |
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| 114 | , id_(shared_count_id) |
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| 115 | #endif |
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| 116 | { |
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| 117 | #if defined( BOOST_MSVC ) && BOOST_WORKAROUND( BOOST_MSVC, <= 1200 ) |
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| 118 | typedef Y* P; |
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| 119 | #endif |
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| 120 | #ifndef BOOST_NO_EXCEPTIONS |
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| 121 | |
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| 122 | try |
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| 123 | { |
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| 124 | pi_ = new sp_counted_impl_pd<P, D>(p, d); |
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| 125 | } |
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| 126 | catch(...) |
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| 127 | { |
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| 128 | d(p); // delete p |
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| 129 | throw; |
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| 130 | } |
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| 131 | |
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| 132 | #else |
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| 133 | |
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| 134 | pi_ = new sp_counted_impl_pd<P, D>(p, d); |
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| 135 | |
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| 136 | if(pi_ == 0) |
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| 137 | { |
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| 138 | d(p); // delete p |
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| 139 | boost::throw_exception(std::bad_alloc()); |
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| 140 | } |
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| 141 | |
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| 142 | #endif |
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| 143 | } |
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| 144 | |
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| 145 | template<class P, class D, class A> shared_count( P p, D d, A a ): pi_( 0 ) |
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| 146 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS) |
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| 147 | , id_(shared_count_id) |
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| 148 | #endif |
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| 149 | { |
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| 150 | typedef sp_counted_impl_pda<P, D, A> impl_type; |
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| 151 | typedef typename A::template rebind< impl_type >::other A2; |
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| 152 | |
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| 153 | A2 a2( a ); |
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| 154 | |
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| 155 | #ifndef BOOST_NO_EXCEPTIONS |
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| 156 | |
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| 157 | try |
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| 158 | { |
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| 159 | pi_ = a2.allocate( 1, static_cast< impl_type* >( 0 ) ); |
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| 160 | new( static_cast< void* >( pi_ ) ) impl_type( p, d, a ); |
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| 161 | } |
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| 162 | catch(...) |
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| 163 | { |
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| 164 | d( p ); |
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| 165 | |
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| 166 | if( pi_ != 0 ) |
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| 167 | { |
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| 168 | a2.deallocate( static_cast< impl_type* >( pi_ ), 1 ); |
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| 169 | } |
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| 170 | |
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| 171 | throw; |
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| 172 | } |
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| 173 | |
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| 174 | #else |
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| 175 | |
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| 176 | pi_ = a2.allocate( 1, static_cast< impl_type* >( 0 ) ); |
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| 177 | |
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| 178 | if( pi_ != 0 ) |
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| 179 | { |
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| 180 | new( static_cast< void* >( pi_ ) ) impl_type( p, d, a ); |
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| 181 | } |
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| 182 | else |
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| 183 | { |
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| 184 | d( p ); |
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| 185 | boost::throw_exception( std::bad_alloc() ); |
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| 186 | } |
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| 187 | |
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| 188 | #endif |
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| 189 | } |
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| 190 | |
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| 191 | #ifndef BOOST_NO_AUTO_PTR |
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| 192 | |
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| 193 | // auto_ptr<Y> is special cased to provide the strong guarantee |
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| 194 | |
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| 195 | template<class Y> |
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| 196 | explicit shared_count( std::auto_ptr<Y> & r ): pi_( new sp_counted_impl_p<Y>( r.get() ) ) |
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| 197 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS) |
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| 198 | , id_(shared_count_id) |
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| 199 | #endif |
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| 200 | { |
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| 201 | #ifdef BOOST_NO_EXCEPTIONS |
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| 202 | |
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| 203 | if( pi_ == 0 ) |
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| 204 | { |
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| 205 | boost::throw_exception(std::bad_alloc()); |
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| 206 | } |
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| 207 | |
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| 208 | #endif |
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| 209 | |
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| 210 | r.release(); |
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| 211 | } |
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| 212 | |
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| 213 | #endif |
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| 214 | |
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| 215 | ~shared_count() // nothrow |
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| 216 | { |
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| 217 | if( pi_ != 0 ) pi_->release(); |
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| 218 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS) |
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| 219 | id_ = 0; |
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| 220 | #endif |
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| 221 | } |
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| 222 | |
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| 223 | shared_count(shared_count const & r): pi_(r.pi_) // nothrow |
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| 224 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS) |
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| 225 | , id_(shared_count_id) |
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| 226 | #endif |
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| 227 | { |
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| 228 | if( pi_ != 0 ) pi_->add_ref_copy(); |
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| 229 | } |
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| 230 | |
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| 231 | #if defined( BOOST_HAS_RVALUE_REFS ) |
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| 232 | |
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| 233 | shared_count(shared_count && r): pi_(r.pi_) // nothrow |
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| 234 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS) |
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| 235 | , id_(shared_count_id) |
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| 236 | #endif |
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| 237 | { |
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| 238 | r.pi_ = 0; |
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| 239 | } |
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| 240 | |
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| 241 | #endif |
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| 242 | |
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| 243 | explicit shared_count(weak_count const & r); // throws bad_weak_ptr when r.use_count() == 0 |
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| 244 | shared_count( weak_count const & r, sp_nothrow_tag ); // constructs an empty *this when r.use_count() == 0 |
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| 245 | |
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| 246 | shared_count & operator= (shared_count const & r) // nothrow |
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| 247 | { |
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| 248 | sp_counted_base * tmp = r.pi_; |
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| 249 | |
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| 250 | if( tmp != pi_ ) |
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| 251 | { |
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| 252 | if( tmp != 0 ) tmp->add_ref_copy(); |
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| 253 | if( pi_ != 0 ) pi_->release(); |
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| 254 | pi_ = tmp; |
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| 255 | } |
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| 256 | |
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| 257 | return *this; |
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| 258 | } |
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| 259 | |
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| 260 | void swap(shared_count & r) // nothrow |
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| 261 | { |
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| 262 | sp_counted_base * tmp = r.pi_; |
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| 263 | r.pi_ = pi_; |
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| 264 | pi_ = tmp; |
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| 265 | } |
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| 266 | |
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| 267 | long use_count() const // nothrow |
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| 268 | { |
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| 269 | return pi_ != 0? pi_->use_count(): 0; |
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| 270 | } |
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| 271 | |
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| 272 | bool unique() const // nothrow |
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| 273 | { |
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| 274 | return use_count() == 1; |
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| 275 | } |
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| 276 | |
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| 277 | bool empty() const // nothrow |
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| 278 | { |
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| 279 | return pi_ == 0; |
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| 280 | } |
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| 281 | |
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| 282 | friend inline bool operator==(shared_count const & a, shared_count const & b) |
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| 283 | { |
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| 284 | return a.pi_ == b.pi_; |
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| 285 | } |
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| 286 | |
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| 287 | friend inline bool operator<(shared_count const & a, shared_count const & b) |
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| 288 | { |
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| 289 | return std::less<sp_counted_base *>()( a.pi_, b.pi_ ); |
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| 290 | } |
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| 291 | |
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| 292 | void * get_deleter( sp_typeinfo const & ti ) const |
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| 293 | { |
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| 294 | return pi_? pi_->get_deleter( ti ): 0; |
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| 295 | } |
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| 296 | }; |
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| 297 | |
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| 298 | |
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| 299 | class weak_count |
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| 300 | { |
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| 301 | private: |
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| 302 | |
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| 303 | sp_counted_base * pi_; |
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| 304 | |
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| 305 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS) |
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| 306 | int id_; |
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| 307 | #endif |
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| 308 | |
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| 309 | friend class shared_count; |
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| 310 | |
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| 311 | public: |
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| 312 | |
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| 313 | weak_count(): pi_(0) // nothrow |
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| 314 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS) |
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| 315 | , id_(weak_count_id) |
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| 316 | #endif |
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| 317 | { |
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| 318 | } |
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| 319 | |
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| 320 | weak_count(shared_count const & r): pi_(r.pi_) // nothrow |
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| 321 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS) |
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| 322 | , id_(weak_count_id) |
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| 323 | #endif |
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| 324 | { |
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| 325 | if(pi_ != 0) pi_->weak_add_ref(); |
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| 326 | } |
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| 327 | |
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| 328 | weak_count(weak_count const & r): pi_(r.pi_) // nothrow |
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| 329 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS) |
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| 330 | , id_(weak_count_id) |
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| 331 | #endif |
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| 332 | { |
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| 333 | if(pi_ != 0) pi_->weak_add_ref(); |
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| 334 | } |
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| 335 | |
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| 336 | // Move support |
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| 337 | |
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| 338 | #if defined( BOOST_HAS_RVALUE_REFS ) |
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| 339 | |
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| 340 | weak_count(weak_count && r): pi_(r.pi_) // nothrow |
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| 341 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS) |
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| 342 | , id_(weak_count_id) |
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| 343 | #endif |
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| 344 | { |
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| 345 | r.pi_ = 0; |
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| 346 | } |
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| 347 | |
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| 348 | #endif |
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| 349 | |
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| 350 | ~weak_count() // nothrow |
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| 351 | { |
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| 352 | if(pi_ != 0) pi_->weak_release(); |
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| 353 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS) |
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| 354 | id_ = 0; |
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| 355 | #endif |
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| 356 | } |
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| 357 | |
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| 358 | weak_count & operator= (shared_count const & r) // nothrow |
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| 359 | { |
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| 360 | sp_counted_base * tmp = r.pi_; |
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| 361 | |
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| 362 | if( tmp != pi_ ) |
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| 363 | { |
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| 364 | if(tmp != 0) tmp->weak_add_ref(); |
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| 365 | if(pi_ != 0) pi_->weak_release(); |
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| 366 | pi_ = tmp; |
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| 367 | } |
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| 368 | |
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| 369 | return *this; |
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| 370 | } |
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| 371 | |
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| 372 | weak_count & operator= (weak_count const & r) // nothrow |
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| 373 | { |
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| 374 | sp_counted_base * tmp = r.pi_; |
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| 375 | |
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| 376 | if( tmp != pi_ ) |
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| 377 | { |
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| 378 | if(tmp != 0) tmp->weak_add_ref(); |
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| 379 | if(pi_ != 0) pi_->weak_release(); |
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| 380 | pi_ = tmp; |
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| 381 | } |
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| 382 | |
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| 383 | return *this; |
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| 384 | } |
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| 385 | |
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| 386 | void swap(weak_count & r) // nothrow |
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| 387 | { |
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| 388 | sp_counted_base * tmp = r.pi_; |
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| 389 | r.pi_ = pi_; |
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| 390 | pi_ = tmp; |
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| 391 | } |
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| 392 | |
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| 393 | long use_count() const // nothrow |
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| 394 | { |
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| 395 | return pi_ != 0? pi_->use_count(): 0; |
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| 396 | } |
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| 397 | |
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| 398 | bool empty() const // nothrow |
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| 399 | { |
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| 400 | return pi_ == 0; |
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| 401 | } |
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| 402 | |
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| 403 | friend inline bool operator==(weak_count const & a, weak_count const & b) |
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| 404 | { |
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| 405 | return a.pi_ == b.pi_; |
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| 406 | } |
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| 407 | |
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| 408 | friend inline bool operator<(weak_count const & a, weak_count const & b) |
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| 409 | { |
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| 410 | return std::less<sp_counted_base *>()(a.pi_, b.pi_); |
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| 411 | } |
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| 412 | }; |
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| 413 | |
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| 414 | inline shared_count::shared_count( weak_count const & r ): pi_( r.pi_ ) |
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| 415 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS) |
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| 416 | , id_(shared_count_id) |
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| 417 | #endif |
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| 418 | { |
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| 419 | if( pi_ == 0 || !pi_->add_ref_lock() ) |
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| 420 | { |
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| 421 | boost::throw_exception( boost::bad_weak_ptr() ); |
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| 422 | } |
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| 423 | } |
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| 424 | |
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| 425 | inline shared_count::shared_count( weak_count const & r, sp_nothrow_tag ): pi_( r.pi_ ) |
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| 426 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS) |
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| 427 | , id_(shared_count_id) |
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| 428 | #endif |
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| 429 | { |
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| 430 | if( pi_ != 0 && !pi_->add_ref_lock() ) |
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| 431 | { |
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| 432 | pi_ = 0; |
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| 433 | } |
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| 434 | } |
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| 435 | |
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| 436 | } // namespace detail |
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| 437 | |
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| 438 | } // namespace boost |
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| 439 | |
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| 440 | #ifdef __BORLANDC__ |
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| 441 | # pragma warn .8027 // Functions containing try are not expanded inline |
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| 442 | #endif |
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| 443 | |
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| 444 | #endif // #ifndef BOOST_SMART_PTR_DETAIL_SHARED_COUNT_HPP_INCLUDED |
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