[857] | 1 | #ifndef BOOST_DETAIL_SHARED_COUNT_132_HPP_INCLUDED
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| 2 | #define BOOST_DETAIL_SHARED_COUNT_132_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 | //
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| 15 | // Distributed under the Boost Software License, Version 1.0. (See
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| 16 | // accompanying file LICENSE_1_0.txt or copy at
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| 17 | // http://www.boost.org/LICENSE_1_0.txt)
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| 18 | //
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| 19 |
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| 20 | #include <boost/config.hpp>
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| 21 |
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| 22 | #if defined(BOOST_SP_USE_STD_ALLOCATOR) && defined(BOOST_SP_USE_QUICK_ALLOCATOR)
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| 23 | # error BOOST_SP_USE_STD_ALLOCATOR and BOOST_SP_USE_QUICK_ALLOCATOR are incompatible.
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| 24 | #endif
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| 25 |
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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/lightweight_mutex.hpp>
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| 29 |
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| 30 | #if defined(BOOST_SP_USE_QUICK_ALLOCATOR)
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| 31 | #include <boost/detail/quick_allocator.hpp>
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| 32 | #endif
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| 33 |
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| 34 | #include <memory> // std::auto_ptr, std::allocator
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| 35 | #include <functional> // std::less
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| 36 | #include <exception> // std::exception
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| 37 | #include <new> // std::bad_alloc
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| 38 | #include <typeinfo> // std::type_info in get_deleter
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| 39 | #include <cstddef> // std::size_t
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| 40 |
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| 41 | #ifdef __BORLANDC__
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| 42 | # pragma warn -8026 // Functions with excep. spec. are not expanded inline
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| 43 | # pragma warn -8027 // Functions containing try are not expanded inline
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| 44 | #endif
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| 45 |
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| 46 | namespace boost_132 {
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| 47 |
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| 48 | #if !BOOST_WORKAROUND( __BORLANDC__, BOOST_TESTED_AT( 0x564) )
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| 49 | using namespace boost;
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| 50 | #endif
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| 51 |
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| 52 | // Debug hooks
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| 53 |
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| 54 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
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| 55 |
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| 56 | void sp_scalar_constructor_hook(void * px, std::size_t size, void * pn);
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| 57 | void sp_array_constructor_hook(void * px);
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| 58 | void sp_scalar_destructor_hook(void * px, std::size_t size, void * pn);
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| 59 | void sp_array_destructor_hook(void * px);
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| 60 |
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| 61 | #endif
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| 62 |
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| 63 |
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| 64 | // The standard library that comes with Borland C++ 5.5.1
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| 65 | // defines std::exception and its members as having C calling
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| 66 | // convention (-pc). When the definition of bad_weak_ptr
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| 67 | // is compiled with -ps, the compiler issues an error.
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| 68 | // Hence, the temporary #pragma option -pc below. The version
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| 69 | // check is deliberately conservative.
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| 70 |
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| 71 | #if defined(__BORLANDC__) && __BORLANDC__ == 0x551
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| 72 | # pragma option push -pc
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| 73 | #endif
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| 74 |
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| 75 | class bad_weak_ptr: public std::exception
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| 76 | {
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| 77 | public:
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| 78 |
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| 79 | virtual char const * what() const throw()
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| 80 | {
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| 81 | return "boost::bad_weak_ptr";
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| 82 | }
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| 83 | };
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| 84 |
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| 85 | #if defined(__BORLANDC__) && __BORLANDC__ == 0x551
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| 86 | # pragma option pop
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| 87 | #endif
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| 88 |
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| 89 | namespace detail{
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| 90 | #if !BOOST_WORKAROUND( __BORLANDC__, BOOST_TESTED_AT( 0x564) )
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| 91 | using namespace boost::detail;
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| 92 | #endif
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| 93 |
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| 94 | class sp_counted_base
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| 95 | {
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| 96 | //private:
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| 97 |
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| 98 | #if BOOST_WORKAROUND( __BORLANDC__, BOOST_TESTED_AT( 0x564) )
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| 99 | typedef boost::detail::lightweight_mutex mutex_type;
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| 100 | #else
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| 101 | typedef detail::lightweight_mutex mutex_type;
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| 102 | #endif
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| 103 |
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| 104 | public:
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| 105 |
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| 106 | sp_counted_base(): use_count_(1), weak_count_(1)
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| 107 | {
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| 108 | }
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| 109 |
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| 110 | virtual ~sp_counted_base() // nothrow
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| 111 | {
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| 112 | }
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| 113 |
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| 114 | // dispose() is called when use_count_ drops to zero, to release
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| 115 | // the resources managed by *this.
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| 116 |
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| 117 | virtual void dispose() = 0; // nothrow
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| 118 |
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| 119 | // destruct() is called when weak_count_ drops to zero.
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| 120 |
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| 121 | virtual void destruct() // nothrow
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| 122 | {
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| 123 | delete this;
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| 124 | }
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| 125 |
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| 126 | virtual void * get_deleter(std::type_info const & ti) = 0;
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| 127 |
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| 128 | void add_ref_copy()
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| 129 | {
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| 130 | #if defined(BOOST_HAS_THREADS)
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| 131 | mutex_type::scoped_lock lock(mtx_);
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| 132 | #endif
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| 133 | ++use_count_;
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| 134 | }
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| 135 |
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| 136 | void add_ref_lock()
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| 137 | {
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| 138 | #if defined(BOOST_HAS_THREADS)
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| 139 | mutex_type::scoped_lock lock(mtx_);
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| 140 | #endif
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| 141 | if(use_count_ == 0) boost::throw_exception(bad_weak_ptr());
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| 142 | ++use_count_;
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| 143 | }
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| 144 |
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| 145 | void release() // nothrow
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| 146 | {
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| 147 | {
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| 148 | #if defined(BOOST_HAS_THREADS)
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| 149 | mutex_type::scoped_lock lock(mtx_);
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| 150 | #endif
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| 151 | long new_use_count = --use_count_;
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| 152 |
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| 153 | if(new_use_count != 0) return;
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| 154 | }
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| 155 |
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| 156 | dispose();
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| 157 | weak_release();
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| 158 | }
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| 159 |
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| 160 | void weak_add_ref() // nothrow
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| 161 | {
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| 162 | #if defined(BOOST_HAS_THREADS)
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| 163 | mutex_type::scoped_lock lock(mtx_);
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| 164 | #endif
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| 165 | ++weak_count_;
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| 166 | }
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| 167 |
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| 168 | void weak_release() // nothrow
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| 169 | {
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| 170 | long new_weak_count;
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| 171 |
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| 172 | {
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| 173 | #if defined(BOOST_HAS_THREADS)
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| 174 | mutex_type::scoped_lock lock(mtx_);
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| 175 | #endif
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| 176 | new_weak_count = --weak_count_;
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| 177 | }
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| 178 |
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| 179 | if(new_weak_count == 0)
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| 180 | {
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| 181 | destruct();
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| 182 | }
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| 183 | }
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| 184 |
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| 185 | long use_count() const // nothrow
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| 186 | {
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| 187 | #if defined(BOOST_HAS_THREADS)
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| 188 | mutex_type::scoped_lock lock(mtx_);
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| 189 | #endif
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| 190 | return use_count_;
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| 191 | }
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| 192 |
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| 193 | //private:
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| 194 | public:
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| 195 | sp_counted_base(sp_counted_base const &);
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| 196 | sp_counted_base & operator= (sp_counted_base const &);
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| 197 |
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| 198 | long use_count_; // #shared
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| 199 | long weak_count_; // #weak + (#shared != 0)
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| 200 |
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| 201 | #if defined(BOOST_HAS_THREADS) || defined(BOOST_LWM_WIN32)
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| 202 | mutable mutex_type mtx_;
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| 203 | #endif
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| 204 | };
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| 205 |
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| 206 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
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| 207 |
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| 208 | template<class T> void cbi_call_constructor_hook(sp_counted_base * pn, T * px, checked_deleter<T> const &, int)
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| 209 | {
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| 210 | boost::sp_scalar_constructor_hook(px, sizeof(T), pn);
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| 211 | }
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| 212 |
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| 213 | template<class T> void cbi_call_constructor_hook(sp_counted_base *, T * px, checked_array_deleter<T> const &, int)
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| 214 | {
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| 215 | boost::sp_array_constructor_hook(px);
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| 216 | }
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| 217 |
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| 218 | template<class P, class D> void cbi_call_constructor_hook(sp_counted_base *, P const &, D const &, long)
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| 219 | {
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| 220 | }
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| 221 |
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| 222 | template<class T> void cbi_call_destructor_hook(sp_counted_base * pn, T * px, checked_deleter<T> const &, int)
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| 223 | {
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| 224 | boost::sp_scalar_destructor_hook(px, sizeof(T), pn);
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| 225 | }
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| 226 |
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| 227 | template<class T> void cbi_call_destructor_hook(sp_counted_base *, T * px, checked_array_deleter<T> const &, int)
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| 228 | {
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| 229 | boost::sp_array_destructor_hook(px);
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| 230 | }
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| 231 |
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| 232 | template<class P, class D> void cbi_call_destructor_hook(sp_counted_base *, P const &, D const &, long)
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| 233 | {
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| 234 | }
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| 235 |
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| 236 | #endif
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| 237 |
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| 238 | //
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| 239 | // Borland's Codeguard trips up over the -Vx- option here:
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| 240 | //
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| 241 | #ifdef __CODEGUARD__
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| 242 | # pragma option push -Vx-
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| 243 | #endif
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| 244 |
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| 245 | template<class P, class D> class sp_counted_base_impl: public sp_counted_base
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| 246 | {
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| 247 | //private:
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| 248 | public:
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| 249 | P ptr; // copy constructor must not throw
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| 250 | D del; // copy constructor must not throw
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| 251 |
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| 252 | sp_counted_base_impl(sp_counted_base_impl const &);
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| 253 | sp_counted_base_impl & operator= (sp_counted_base_impl const &);
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| 254 |
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| 255 | typedef sp_counted_base_impl<P, D> this_type;
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| 256 |
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| 257 | public:
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| 258 |
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| 259 | // pre: initial_use_count <= initial_weak_count, d(p) must not throw
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| 260 |
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| 261 | sp_counted_base_impl(P p, D d): ptr(p), del(d)
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| 262 | {
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| 263 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
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| 264 | detail::cbi_call_constructor_hook(this, p, d, 0);
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| 265 | #endif
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| 266 | }
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| 267 |
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| 268 | virtual void dispose() // nothrow
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| 269 | {
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| 270 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
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| 271 | detail::cbi_call_destructor_hook(this, ptr, del, 0);
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| 272 | #endif
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| 273 | del(ptr);
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| 274 | }
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| 275 |
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| 276 | virtual void * get_deleter(std::type_info const & ti)
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| 277 | {
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| 278 | return ti == typeid(D)? &del: 0;
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| 279 | }
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| 280 |
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| 281 | #if defined(BOOST_SP_USE_STD_ALLOCATOR)
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| 282 |
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| 283 | void * operator new(std::size_t)
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| 284 | {
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| 285 | return std::allocator<this_type>().allocate(1, static_cast<this_type *>(0));
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| 286 | }
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| 287 |
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| 288 | void operator delete(void * p)
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| 289 | {
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| 290 | std::allocator<this_type>().deallocate(static_cast<this_type *>(p), 1);
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| 291 | }
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| 292 |
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| 293 | #endif
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| 294 |
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| 295 | #if defined(BOOST_SP_USE_QUICK_ALLOCATOR)
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| 296 |
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| 297 | void * operator new(std::size_t)
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| 298 | {
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| 299 | return quick_allocator<this_type>::alloc();
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| 300 | }
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| 301 |
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| 302 | void operator delete(void * p)
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| 303 | {
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| 304 | quick_allocator<this_type>::dealloc(p);
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| 305 | }
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| 306 |
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| 307 | #endif
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| 308 | };
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| 309 |
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| 310 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
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| 311 |
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| 312 | int const shared_count_id = 0x2C35F101;
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| 313 | int const weak_count_id = 0x298C38A4;
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| 314 |
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| 315 | #endif
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| 316 |
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| 317 | class weak_count;
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| 318 |
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| 319 | class shared_count
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| 320 | {
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| 321 | //private:
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| 322 | public:
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| 323 | sp_counted_base * pi_;
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| 324 |
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| 325 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
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| 326 | int id_;
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| 327 | #endif
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| 328 |
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| 329 | friend class weak_count;
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| 330 |
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| 331 | public:
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| 332 |
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| 333 | shared_count(): pi_(0) // nothrow
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| 334 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
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| 335 | , id_(shared_count_id)
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| 336 | #endif
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| 337 | {
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| 338 | }
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| 339 |
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| 340 | template<class P, class D> shared_count(P p, D d): pi_(0)
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| 341 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
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| 342 | , id_(shared_count_id)
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| 343 | #endif
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| 344 | {
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| 345 | #ifndef BOOST_NO_EXCEPTIONS
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| 346 |
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| 347 | try
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| 348 | {
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| 349 | pi_ = new sp_counted_base_impl<P, D>(p, d);
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| 350 | }
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| 351 | catch(...)
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| 352 | {
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| 353 | d(p); // delete p
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| 354 | throw;
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| 355 | }
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| 356 |
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| 357 | #else
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| 358 |
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| 359 | pi_ = new sp_counted_base_impl<P, D>(p, d);
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| 360 |
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| 361 | if(pi_ == 0)
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| 362 | {
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| 363 | d(p); // delete p
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| 364 | boost::throw_exception(std::bad_alloc());
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| 365 | }
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| 366 |
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| 367 | #endif
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| 368 | }
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| 369 |
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| 370 | #ifndef BOOST_NO_AUTO_PTR
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| 371 |
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| 372 | // auto_ptr<Y> is special cased to provide the strong guarantee
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| 373 |
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| 374 | template<class Y>
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| 375 | explicit shared_count(std::auto_ptr<Y> & r): pi_(new sp_counted_base_impl< Y *, checked_deleter<Y> >(r.get(), checked_deleter<Y>()))
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| 376 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
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| 377 | , id_(shared_count_id)
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| 378 | #endif
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| 379 | {
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| 380 | r.release();
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| 381 | }
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| 382 |
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| 383 | #endif
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| 384 |
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| 385 | ~shared_count() // nothrow
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| 386 | {
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| 387 | if(pi_ != 0) pi_->release();
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| 388 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
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| 389 | id_ = 0;
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| 390 | #endif
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| 391 | }
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| 392 |
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| 393 | shared_count(shared_count const & r): pi_(r.pi_) // nothrow
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| 394 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
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| 395 | , id_(shared_count_id)
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| 396 | #endif
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| 397 | {
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| 398 | if(pi_ != 0) pi_->add_ref_copy();
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| 399 | }
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| 400 |
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| 401 | explicit shared_count(weak_count const & r); // throws bad_weak_ptr when r.use_count() == 0
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| 402 |
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| 403 | shared_count & operator= (shared_count const & r) // nothrow
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| 404 | {
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| 405 | sp_counted_base * tmp = r.pi_;
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| 406 |
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| 407 | if(tmp != pi_)
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| 408 | {
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| 409 | if(tmp != 0) tmp->add_ref_copy();
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| 410 | if(pi_ != 0) pi_->release();
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| 411 | pi_ = tmp;
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| 412 | }
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| 413 |
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| 414 | return *this;
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| 415 | }
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| 416 |
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| 417 | void swap(shared_count & r) // nothrow
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| 418 | {
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| 419 | sp_counted_base * tmp = r.pi_;
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| 420 | r.pi_ = pi_;
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| 421 | pi_ = tmp;
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| 422 | }
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| 423 |
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| 424 | long use_count() const // nothrow
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| 425 | {
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| 426 | return pi_ != 0? pi_->use_count(): 0;
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| 427 | }
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| 428 |
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| 429 | bool unique() const // nothrow
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| 430 | {
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| 431 | return use_count() == 1;
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| 432 | }
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| 433 |
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| 434 | friend inline bool operator==(shared_count const & a, shared_count const & b)
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| 435 | {
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| 436 | return a.pi_ == b.pi_;
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| 437 | }
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| 438 |
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| 439 | friend inline bool operator<(shared_count const & a, shared_count const & b)
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| 440 | {
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| 441 | return std::less<sp_counted_base *>()(a.pi_, b.pi_);
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| 442 | }
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| 443 |
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| 444 | void * get_deleter(std::type_info const & ti) const
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| 445 | {
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| 446 | return pi_? pi_->get_deleter(ti): 0;
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| 447 | }
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| 448 | };
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| 449 |
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| 450 | #ifdef __CODEGUARD__
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| 451 | # pragma option pop
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| 452 | #endif
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| 453 |
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| 454 |
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| 455 | class weak_count
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| 456 | {
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| 457 | private:
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| 458 |
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| 459 | sp_counted_base * pi_;
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| 460 |
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| 461 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
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| 462 | int id_;
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| 463 | #endif
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| 464 |
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| 465 | friend class shared_count;
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| 466 |
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| 467 | public:
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| 468 |
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| 469 | weak_count(): pi_(0) // nothrow
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| 470 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
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| 471 | , id_(weak_count_id)
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| 472 | #endif
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| 473 | {
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| 474 | }
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| 475 |
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| 476 | weak_count(shared_count const & r): pi_(r.pi_) // nothrow
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| 477 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
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| 478 | , id_(shared_count_id)
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| 479 | #endif
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| 480 | {
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| 481 | if(pi_ != 0) pi_->weak_add_ref();
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| 482 | }
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| 483 |
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| 484 | weak_count(weak_count const & r): pi_(r.pi_) // nothrow
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| 485 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
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| 486 | , id_(shared_count_id)
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| 487 | #endif
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| 488 | {
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| 489 | if(pi_ != 0) pi_->weak_add_ref();
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| 490 | }
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| 491 |
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| 492 | ~weak_count() // nothrow
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| 493 | {
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| 494 | if(pi_ != 0) pi_->weak_release();
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| 495 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
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| 496 | id_ = 0;
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| 497 | #endif
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| 498 | }
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| 499 |
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| 500 | weak_count & operator= (shared_count const & r) // nothrow
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| 501 | {
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| 502 | sp_counted_base * tmp = r.pi_;
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| 503 | if(tmp != 0) tmp->weak_add_ref();
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| 504 | if(pi_ != 0) pi_->weak_release();
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| 505 | pi_ = tmp;
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| 506 |
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| 507 | return *this;
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| 508 | }
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| 509 |
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| 510 | weak_count & operator= (weak_count const & r) // nothrow
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| 511 | {
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| 512 | sp_counted_base * tmp = r.pi_;
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| 513 | if(tmp != 0) tmp->weak_add_ref();
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| 514 | if(pi_ != 0) pi_->weak_release();
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| 515 | pi_ = tmp;
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| 516 |
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| 517 | return *this;
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| 518 | }
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| 519 |
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| 520 | void swap(weak_count & r) // nothrow
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| 521 | {
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| 522 | sp_counted_base * tmp = r.pi_;
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| 523 | r.pi_ = pi_;
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| 524 | pi_ = tmp;
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| 525 | }
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| 526 |
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| 527 | long use_count() const // nothrow
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| 528 | {
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| 529 | return pi_ != 0? pi_->use_count(): 0;
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| 530 | }
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| 531 |
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| 532 | friend inline bool operator==(weak_count const & a, weak_count const & b)
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| 533 | {
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| 534 | return a.pi_ == b.pi_;
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| 535 | }
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| 536 |
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| 537 | friend inline bool operator<(weak_count const & a, weak_count const & b)
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| 538 | {
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| 539 | return std::less<sp_counted_base *>()(a.pi_, b.pi_);
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| 540 | }
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| 541 | };
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| 542 |
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| 543 | inline shared_count::shared_count(weak_count const & r): pi_(r.pi_)
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| 544 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
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| 545 | , id_(shared_count_id)
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| 546 | #endif
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| 547 | {
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| 548 | if(pi_ != 0)
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| 549 | {
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| 550 | pi_->add_ref_lock();
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| 551 | }
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| 552 | else
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| 553 | {
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| 554 | boost::throw_exception(bad_weak_ptr());
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| 555 | }
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| 556 | }
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| 557 |
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| 558 | } // namespace detail
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| 559 |
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| 560 | } // namespace boost
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| 561 |
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| 562 | #ifdef __BORLANDC__
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| 563 | # pragma warn .8027 // Functions containing try are not expanded inline
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| 564 | # pragma warn .8026 // Functions with excep. spec. are not expanded inline
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| 565 | #endif
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| 566 |
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| 567 | #endif // #ifndef BOOST_DETAIL_SHARED_COUNT_HPP_INCLUDED
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