[44] | 1 | #ifndef BOOST_SMART_PTR_INTRUSIVE_PTR_HPP_INCLUDED |
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| 2 | #define BOOST_SMART_PTR_INTRUSIVE_PTR_HPP_INCLUDED |
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| 3 | |
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| 4 | // |
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| 5 | // intrusive_ptr.hpp |
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| 6 | // |
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| 7 | // Copyright (c) 2001, 2002 Peter Dimov |
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| 8 | // |
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| 9 | // Distributed under the Boost Software License, Version 1.0. (See |
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| 10 | // accompanying file LICENSE_1_0.txt or copy at |
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| 11 | // http://www.boost.org/LICENSE_1_0.txt) |
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| 12 | // |
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| 13 | // See http://www.boost.org/libs/smart_ptr/intrusive_ptr.html for documentation. |
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| 14 | // |
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| 15 | |
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| 16 | #include <boost/config.hpp> |
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| 17 | |
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| 18 | #ifdef BOOST_MSVC // moved here to work around VC++ compiler crash |
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| 19 | # pragma warning(push) |
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| 20 | # pragma warning(disable:4284) // odd return type for operator-> |
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| 21 | #endif |
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| 22 | |
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| 23 | #include <boost/assert.hpp> |
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| 24 | #include <boost/detail/workaround.hpp> |
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| 25 | #include <boost/smart_ptr/detail/sp_convertible.hpp> |
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| 26 | |
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| 27 | #include <boost/config/no_tr1/functional.hpp> // for std::less |
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| 28 | |
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| 29 | #if !defined(BOOST_NO_IOSTREAM) |
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| 30 | #if !defined(BOOST_NO_IOSFWD) |
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| 31 | #include <iosfwd> // for std::basic_ostream |
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| 32 | #else |
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| 33 | #include <ostream> |
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| 34 | #endif |
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| 35 | #endif |
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| 36 | |
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| 37 | |
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| 38 | namespace boost |
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| 39 | { |
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| 40 | |
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| 41 | // |
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| 42 | // intrusive_ptr |
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| 43 | // |
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| 44 | // A smart pointer that uses intrusive reference counting. |
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| 45 | // |
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| 46 | // Relies on unqualified calls to |
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| 47 | // |
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| 48 | // void intrusive_ptr_add_ref(T * p); |
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| 49 | // void intrusive_ptr_release(T * p); |
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| 50 | // |
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| 51 | // (p != 0) |
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| 52 | // |
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| 53 | // The object is responsible for destroying itself. |
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| 54 | // |
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| 55 | |
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| 56 | template<class T> class intrusive_ptr |
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| 57 | { |
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| 58 | private: |
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| 59 | |
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| 60 | typedef intrusive_ptr this_type; |
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| 61 | |
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| 62 | public: |
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| 63 | |
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| 64 | typedef T element_type; |
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| 65 | |
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| 66 | intrusive_ptr(): px( 0 ) |
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| 67 | { |
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| 68 | } |
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| 69 | |
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| 70 | intrusive_ptr( T * p, bool add_ref = true ): px( p ) |
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| 71 | { |
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| 72 | if( px != 0 && add_ref ) intrusive_ptr_add_ref( px ); |
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| 73 | } |
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| 74 | |
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| 75 | #if !defined(BOOST_NO_MEMBER_TEMPLATES) || defined(BOOST_MSVC6_MEMBER_TEMPLATES) |
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| 76 | |
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| 77 | template<class U> |
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| 78 | #if !defined( BOOST_SP_NO_SP_CONVERTIBLE ) |
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| 79 | |
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| 80 | intrusive_ptr( intrusive_ptr<U> const & rhs, typename boost::detail::sp_enable_if_convertible<U,T>::type = boost::detail::sp_empty() ) |
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| 81 | |
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| 82 | #else |
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| 83 | |
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| 84 | intrusive_ptr( intrusive_ptr<U> const & rhs ) |
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| 85 | |
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| 86 | #endif |
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| 87 | : px( rhs.get() ) |
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| 88 | { |
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| 89 | if( px != 0 ) intrusive_ptr_add_ref( px ); |
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| 90 | } |
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| 91 | |
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| 92 | #endif |
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| 93 | |
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| 94 | intrusive_ptr(intrusive_ptr const & rhs): px( rhs.px ) |
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| 95 | { |
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| 96 | if( px != 0 ) intrusive_ptr_add_ref( px ); |
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| 97 | } |
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| 98 | |
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| 99 | ~intrusive_ptr() |
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| 100 | { |
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| 101 | if( px != 0 ) intrusive_ptr_release( px ); |
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| 102 | } |
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| 103 | |
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| 104 | #if !defined(BOOST_NO_MEMBER_TEMPLATES) || defined(BOOST_MSVC6_MEMBER_TEMPLATES) |
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| 105 | |
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| 106 | template<class U> intrusive_ptr & operator=(intrusive_ptr<U> const & rhs) |
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| 107 | { |
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| 108 | this_type(rhs).swap(*this); |
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| 109 | return *this; |
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| 110 | } |
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| 111 | |
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| 112 | #endif |
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| 113 | |
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| 114 | // Move support |
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| 115 | |
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| 116 | #if defined( BOOST_HAS_RVALUE_REFS ) |
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| 117 | |
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| 118 | intrusive_ptr(intrusive_ptr && rhs): px( rhs.px ) |
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| 119 | { |
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| 120 | rhs.px = 0; |
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| 121 | } |
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| 122 | |
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| 123 | intrusive_ptr & operator=(intrusive_ptr && rhs) |
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| 124 | { |
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| 125 | this_type( static_cast< intrusive_ptr && >( rhs ) ).swap(*this); |
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| 126 | return *this; |
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| 127 | } |
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| 128 | |
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| 129 | #endif |
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| 130 | |
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| 131 | intrusive_ptr & operator=(intrusive_ptr const & rhs) |
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| 132 | { |
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| 133 | this_type(rhs).swap(*this); |
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| 134 | return *this; |
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| 135 | } |
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| 136 | |
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| 137 | intrusive_ptr & operator=(T * rhs) |
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| 138 | { |
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| 139 | this_type(rhs).swap(*this); |
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| 140 | return *this; |
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| 141 | } |
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| 142 | |
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| 143 | void reset() |
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| 144 | { |
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| 145 | this_type().swap( *this ); |
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| 146 | } |
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| 147 | |
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| 148 | void reset( T * rhs ) |
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| 149 | { |
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| 150 | this_type( rhs ).swap( *this ); |
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| 151 | } |
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| 152 | |
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| 153 | T * get() const |
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| 154 | { |
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| 155 | return px; |
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| 156 | } |
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| 157 | |
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| 158 | T & operator*() const |
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| 159 | { |
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| 160 | BOOST_ASSERT( px != 0 ); |
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| 161 | return *px; |
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| 162 | } |
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| 163 | |
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| 164 | T * operator->() const |
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| 165 | { |
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| 166 | BOOST_ASSERT( px != 0 ); |
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| 167 | return px; |
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| 168 | } |
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| 169 | |
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| 170 | // implicit conversion to "bool" |
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| 171 | #include <boost/smart_ptr/detail/operator_bool.hpp> |
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| 172 | |
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| 173 | void swap(intrusive_ptr & rhs) |
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| 174 | { |
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| 175 | T * tmp = px; |
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| 176 | px = rhs.px; |
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| 177 | rhs.px = tmp; |
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| 178 | } |
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| 179 | |
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| 180 | private: |
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| 181 | |
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| 182 | T * px; |
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| 183 | }; |
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| 184 | |
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| 185 | template<class T, class U> inline bool operator==(intrusive_ptr<T> const & a, intrusive_ptr<U> const & b) |
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| 186 | { |
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| 187 | return a.get() == b.get(); |
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| 188 | } |
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| 189 | |
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| 190 | template<class T, class U> inline bool operator!=(intrusive_ptr<T> const & a, intrusive_ptr<U> const & b) |
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| 191 | { |
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| 192 | return a.get() != b.get(); |
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| 193 | } |
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| 194 | |
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| 195 | template<class T, class U> inline bool operator==(intrusive_ptr<T> const & a, U * b) |
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| 196 | { |
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| 197 | return a.get() == b; |
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| 198 | } |
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| 199 | |
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| 200 | template<class T, class U> inline bool operator!=(intrusive_ptr<T> const & a, U * b) |
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| 201 | { |
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| 202 | return a.get() != b; |
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| 203 | } |
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| 204 | |
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| 205 | template<class T, class U> inline bool operator==(T * a, intrusive_ptr<U> const & b) |
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| 206 | { |
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| 207 | return a == b.get(); |
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| 208 | } |
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| 209 | |
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| 210 | template<class T, class U> inline bool operator!=(T * a, intrusive_ptr<U> const & b) |
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| 211 | { |
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| 212 | return a != b.get(); |
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| 213 | } |
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| 214 | |
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| 215 | #if __GNUC__ == 2 && __GNUC_MINOR__ <= 96 |
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| 216 | |
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| 217 | // Resolve the ambiguity between our op!= and the one in rel_ops |
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| 218 | |
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| 219 | template<class T> inline bool operator!=(intrusive_ptr<T> const & a, intrusive_ptr<T> const & b) |
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| 220 | { |
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| 221 | return a.get() != b.get(); |
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| 222 | } |
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| 223 | |
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| 224 | #endif |
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| 225 | |
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| 226 | template<class T> inline bool operator<(intrusive_ptr<T> const & a, intrusive_ptr<T> const & b) |
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| 227 | { |
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| 228 | return std::less<T *>()(a.get(), b.get()); |
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| 229 | } |
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| 230 | |
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| 231 | template<class T> void swap(intrusive_ptr<T> & lhs, intrusive_ptr<T> & rhs) |
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| 232 | { |
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| 233 | lhs.swap(rhs); |
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| 234 | } |
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| 235 | |
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| 236 | // mem_fn support |
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| 237 | |
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| 238 | template<class T> T * get_pointer(intrusive_ptr<T> const & p) |
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| 239 | { |
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| 240 | return p.get(); |
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| 241 | } |
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| 242 | |
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| 243 | template<class T, class U> intrusive_ptr<T> static_pointer_cast(intrusive_ptr<U> const & p) |
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| 244 | { |
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| 245 | return static_cast<T *>(p.get()); |
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| 246 | } |
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| 247 | |
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| 248 | template<class T, class U> intrusive_ptr<T> const_pointer_cast(intrusive_ptr<U> const & p) |
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| 249 | { |
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| 250 | return const_cast<T *>(p.get()); |
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| 251 | } |
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| 252 | |
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| 253 | template<class T, class U> intrusive_ptr<T> dynamic_pointer_cast(intrusive_ptr<U> const & p) |
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| 254 | { |
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| 255 | return dynamic_cast<T *>(p.get()); |
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| 256 | } |
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| 257 | |
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| 258 | // operator<< |
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| 259 | |
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| 260 | #if !defined(BOOST_NO_IOSTREAM) |
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| 261 | |
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| 262 | #if defined(BOOST_NO_TEMPLATED_IOSTREAMS) || ( defined(__GNUC__) && (__GNUC__ < 3) ) |
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| 263 | |
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| 264 | template<class Y> std::ostream & operator<< (std::ostream & os, intrusive_ptr<Y> const & p) |
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| 265 | { |
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| 266 | os << p.get(); |
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| 267 | return os; |
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| 268 | } |
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| 269 | |
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| 270 | #else |
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| 271 | |
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| 272 | // in STLport's no-iostreams mode no iostream symbols can be used |
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| 273 | #ifndef _STLP_NO_IOSTREAMS |
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| 274 | |
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| 275 | # if defined(BOOST_MSVC) && BOOST_WORKAROUND(BOOST_MSVC, < 1300 && __SGI_STL_PORT) |
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| 276 | // MSVC6 has problems finding std::basic_ostream through the using declaration in namespace _STL |
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| 277 | using std::basic_ostream; |
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| 278 | template<class E, class T, class Y> basic_ostream<E, T> & operator<< (basic_ostream<E, T> & os, intrusive_ptr<Y> const & p) |
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| 279 | # else |
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| 280 | template<class E, class T, class Y> std::basic_ostream<E, T> & operator<< (std::basic_ostream<E, T> & os, intrusive_ptr<Y> const & p) |
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| 281 | # endif |
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| 282 | { |
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| 283 | os << p.get(); |
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| 284 | return os; |
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| 285 | } |
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| 286 | |
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| 287 | #endif // _STLP_NO_IOSTREAMS |
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| 288 | |
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| 289 | #endif // __GNUC__ < 3 |
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| 290 | |
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| 291 | #endif // !defined(BOOST_NO_IOSTREAM) |
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| 292 | |
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| 293 | } // namespace boost |
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| 294 | |
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| 295 | #ifdef BOOST_MSVC |
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| 296 | # pragma warning(pop) |
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| 297 | #endif |
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| 298 | |
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| 299 | #endif // #ifndef BOOST_SMART_PTR_INTRUSIVE_PTR_HPP_INCLUDED |
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