1 | #ifndef BOOST_SHARED_PTR_HPP_INCLUDED
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2 | #define BOOST_SHARED_PTR_HPP_INCLUDED
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3 |
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4 | //
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5 | // shared_ptr.hpp
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6 | //
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7 | // (C) Copyright Greg Colvin and Beman Dawes 1998, 1999.
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8 | // Copyright (c) 2001-2006 Peter Dimov
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9 | // Copyright Paul A. Bristow, 2007 - implemented warning supression from P Dimov May 2007
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10 | //
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11 | // Distributed under the Boost Software License, Version 1.0. (See
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12 | // accompanying file LICENSE_1_0.txt or copy at
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13 | // http://www.boost.org/LICENSE_1_0.txt)
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14 | //
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15 | // See http://www.boost.org/libs/smart_ptr/shared_ptr.htm for documentation.
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16 | //
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17 |
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18 | #include <boost/config.hpp> // for broken compiler workarounds
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19 |
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20 | #if defined(BOOST_NO_MEMBER_TEMPLATES) && !defined(BOOST_MSVC6_MEMBER_TEMPLATES)
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21 | #include <boost/detail/shared_ptr_nmt.hpp>
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22 | #else
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23 |
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24 | #include <memory> // for std::auto_ptr
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25 |
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26 | #include <boost/assert.hpp>
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27 | #include <boost/checked_delete.hpp>
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28 | #include <boost/throw_exception.hpp>
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29 | #include <boost/detail/shared_count.hpp>
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30 | #include <boost/detail/workaround.hpp>
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31 |
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32 | #include <algorithm> // for std::swap
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33 | #include <functional> // for std::less
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34 | #include <typeinfo> // for std::bad_cast
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35 | #include <iosfwd> // for std::basic_ostream
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36 |
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37 | #ifdef BOOST_MSVC // moved here to work around VC++ compiler crash
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38 | # pragma warning(push)
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39 | # pragma warning(disable:4284) // odd return type for operator->
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40 | #endif
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41 |
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42 | namespace boost
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43 | {
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44 |
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45 | template<class T> class weak_ptr;
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46 | template<class T> class enable_shared_from_this;
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47 |
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48 | namespace detail
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49 | {
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50 |
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51 | struct static_cast_tag {};
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52 | struct const_cast_tag {};
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53 | struct dynamic_cast_tag {};
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54 | struct polymorphic_cast_tag {};
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55 |
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56 | template<class T> struct shared_ptr_traits
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57 | {
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58 | typedef T & reference;
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59 | };
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60 |
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61 | template<> struct shared_ptr_traits<void>
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62 | {
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63 | typedef void reference;
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64 | };
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65 |
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66 | #if !defined(BOOST_NO_CV_VOID_SPECIALIZATIONS)
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67 |
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68 | template<> struct shared_ptr_traits<void const>
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69 | {
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70 | typedef void reference;
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71 | };
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72 |
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73 | template<> struct shared_ptr_traits<void volatile>
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74 | {
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75 | typedef void reference;
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76 | };
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77 |
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78 | template<> struct shared_ptr_traits<void const volatile>
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79 | {
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80 | typedef void reference;
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81 | };
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82 |
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83 | #endif
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84 |
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85 | // enable_shared_from_this support
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86 |
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87 | template<class T, class Y> void sp_enable_shared_from_this( shared_count const & pn, boost::enable_shared_from_this<T> const * pe, Y const * px )
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88 | {
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89 | if(pe != 0) pe->_internal_weak_this._internal_assign(const_cast<Y*>(px), pn);
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90 | }
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91 |
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92 |
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93 | #if !defined( BOOST_NO_SFINAE ) && !defined( BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION ) && !defined( BOOST_NO_AUTO_PTR )
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94 |
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95 | // rvalue auto_ptr support based on a technique by Dave Abrahams
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96 |
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97 | template< class T, class R > struct sp_enable_if_auto_ptr
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98 | {
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99 | };
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100 |
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101 | template< class T, class R > struct sp_enable_if_auto_ptr< std::auto_ptr< T >, R >
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102 | {
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103 | typedef R type;
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104 | };
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105 |
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106 | #endif
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107 |
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108 | } // namespace detail
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109 |
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110 |
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111 | //
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112 | // shared_ptr
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113 | //
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114 | // An enhanced relative of scoped_ptr with reference counted copy semantics.
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115 | // The object pointed to is deleted when the last shared_ptr pointing to it
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116 | // is destroyed or reset.
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117 | //
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118 |
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119 | template<class T> class shared_ptr
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120 | {
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121 | private:
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122 |
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123 | // Borland 5.5.1 specific workaround
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124 | typedef shared_ptr<T> this_type;
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125 |
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126 | public:
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127 |
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128 | typedef T element_type;
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129 | typedef T value_type;
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130 | typedef T * pointer;
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131 | typedef typename boost::detail::shared_ptr_traits<T>::reference reference;
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132 |
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133 | shared_ptr(): px(0), pn() // never throws in 1.30+
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134 | {
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135 | }
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136 |
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137 | template<class Y>
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138 | explicit shared_ptr( Y * p ): px( p ), pn( p ) // Y must be complete
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139 | {
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140 | boost::detail::sp_enable_shared_from_this( pn, p, p );
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141 | }
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142 |
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143 | //
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144 | // Requirements: D's copy constructor must not throw
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145 | //
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146 | // shared_ptr will release p by calling d(p)
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147 | //
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148 |
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149 | template<class Y, class D> shared_ptr(Y * p, D d): px(p), pn(p, d)
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150 | {
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151 | boost::detail::sp_enable_shared_from_this( pn, p, p );
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152 | }
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153 |
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154 | // As above, but with allocator. A's copy constructor shall not throw.
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155 |
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156 | template<class Y, class D, class A> shared_ptr( Y * p, D d, A a ): px( p ), pn( p, d, a )
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157 | {
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158 | boost::detail::sp_enable_shared_from_this( pn, p, p );
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159 | }
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160 |
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161 | // generated copy constructor, assignment, destructor are fine...
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162 |
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163 | // except that Borland C++ has a bug, and g++ with -Wsynth warns
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164 | #if defined(__BORLANDC__) || defined(__GNUC__)
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165 |
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166 | shared_ptr & operator=(shared_ptr const & r) // never throws
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167 | {
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168 | px = r.px;
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169 | pn = r.pn; // shared_count::op= doesn't throw
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170 | return *this;
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171 | }
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172 |
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173 | #endif
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174 |
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175 | template<class Y>
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176 | explicit shared_ptr(weak_ptr<Y> const & r): pn(r.pn) // may throw
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177 | {
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178 | // it is now safe to copy r.px, as pn(r.pn) did not throw
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179 | px = r.px;
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180 | }
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181 |
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182 | template<class Y>
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183 | shared_ptr(shared_ptr<Y> const & r): px(r.px), pn(r.pn) // never throws
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184 | {
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185 | }
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186 |
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187 | template<class Y>
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188 | shared_ptr(shared_ptr<Y> const & r, boost::detail::static_cast_tag): px(static_cast<element_type *>(r.px)), pn(r.pn)
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189 | {
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190 | }
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191 |
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192 | template<class Y>
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193 | shared_ptr(shared_ptr<Y> const & r, boost::detail::const_cast_tag): px(const_cast<element_type *>(r.px)), pn(r.pn)
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194 | {
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195 | }
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196 |
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197 | template<class Y>
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198 | shared_ptr(shared_ptr<Y> const & r, boost::detail::dynamic_cast_tag): px(dynamic_cast<element_type *>(r.px)), pn(r.pn)
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199 | {
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200 | if(px == 0) // need to allocate new counter -- the cast failed
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201 | {
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202 | pn = boost::detail::shared_count();
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203 | }
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204 | }
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205 |
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206 | template<class Y>
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207 | shared_ptr(shared_ptr<Y> const & r, boost::detail::polymorphic_cast_tag): px(dynamic_cast<element_type *>(r.px)), pn(r.pn)
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208 | {
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209 | if(px == 0)
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210 | {
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211 | boost::throw_exception(std::bad_cast());
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212 | }
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213 | }
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214 |
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215 | #ifndef BOOST_NO_AUTO_PTR
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216 |
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217 | template<class Y>
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218 | explicit shared_ptr(std::auto_ptr<Y> & r): px(r.get()), pn()
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219 | {
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220 | Y * tmp = r.get();
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221 | pn = boost::detail::shared_count(r);
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222 | boost::detail::sp_enable_shared_from_this( pn, tmp, tmp );
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223 | }
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224 |
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225 | #if !defined( BOOST_NO_SFINAE ) && !defined( BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION )
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226 |
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227 | template<class Ap>
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228 | shared_ptr( Ap r, typename boost::detail::sp_enable_if_auto_ptr<Ap, int>::type = 0 ): px( r.get() ), pn()
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229 | {
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230 | typename Ap::element_type * tmp = r.get();
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231 | pn = boost::detail::shared_count( r );
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232 | boost::detail::sp_enable_shared_from_this( pn, tmp, tmp );
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233 | }
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234 |
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235 |
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236 | #endif // BOOST_NO_SFINAE, BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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237 |
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238 | #endif // BOOST_NO_AUTO_PTR
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239 |
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240 | #if !defined(BOOST_MSVC) || (BOOST_MSVC >= 1300)
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241 |
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242 | template<class Y>
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243 | shared_ptr & operator=(shared_ptr<Y> const & r) // never throws
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244 | {
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245 | px = r.px;
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246 | pn = r.pn; // shared_count::op= doesn't throw
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247 | return *this;
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248 | }
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249 |
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250 | #endif
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251 |
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252 | #ifndef BOOST_NO_AUTO_PTR
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253 |
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254 | template<class Y>
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255 | shared_ptr & operator=( std::auto_ptr<Y> & r )
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256 | {
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257 | this_type(r).swap(*this);
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258 | return *this;
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259 | }
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260 |
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261 | #if !defined( BOOST_NO_SFINAE ) && !defined( BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION )
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262 |
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263 | template<class Ap>
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264 | typename boost::detail::sp_enable_if_auto_ptr< Ap, shared_ptr & >::type operator=( Ap r )
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265 | {
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266 | this_type( r ).swap( *this );
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267 | return *this;
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268 | }
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269 |
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270 |
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271 | #endif // BOOST_NO_SFINAE, BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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272 |
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273 | #endif // BOOST_NO_AUTO_PTR
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274 |
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275 | void reset() // never throws in 1.30+
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276 | {
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277 | this_type().swap(*this);
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278 | }
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279 |
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280 | template<class Y> void reset(Y * p) // Y must be complete
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281 | {
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282 | BOOST_ASSERT(p == 0 || p != px); // catch self-reset errors
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283 | this_type(p).swap(*this);
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284 | }
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285 |
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286 | template<class Y, class D> void reset( Y * p, D d )
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287 | {
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288 | this_type( p, d ).swap( *this );
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289 | }
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290 |
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291 | template<class Y, class D, class A> void reset( Y * p, D d, A a )
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292 | {
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293 | this_type( p, d, a ).swap( *this );
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294 | }
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295 |
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296 | reference operator* () const // never throws
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297 | {
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298 | BOOST_ASSERT(px != 0);
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299 | return *px;
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300 | }
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301 |
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302 | T * operator-> () const // never throws
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303 | {
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304 | BOOST_ASSERT(px != 0);
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305 | return px;
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306 | }
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307 |
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308 | T * get() const // never throws
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309 | {
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310 | return px;
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311 | }
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312 |
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313 | // implicit conversion to "bool"
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314 |
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315 | #if defined(__SUNPRO_CC) && BOOST_WORKAROUND(__SUNPRO_CC, <= 0x530)
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316 |
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317 | operator bool () const
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318 | {
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319 | return px != 0;
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320 | }
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321 |
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322 | #elif \
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323 | ( defined(__MWERKS__) && BOOST_WORKAROUND(__MWERKS__, < 0x3200) ) || \
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324 | ( defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ < 304) )
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325 |
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326 | typedef T * (this_type::*unspecified_bool_type)() const;
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327 |
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328 | operator unspecified_bool_type() const // never throws
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329 | {
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330 | return px == 0? 0: &this_type::get;
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331 | }
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332 |
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333 | #else
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334 |
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335 | typedef T * this_type::*unspecified_bool_type;
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336 |
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337 | operator unspecified_bool_type() const // never throws
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338 | {
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339 | return px == 0? 0: &this_type::px;
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340 | }
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341 |
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342 | #endif
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343 |
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344 | // operator! is redundant, but some compilers need it
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345 |
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346 | bool operator! () const // never throws
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347 | {
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348 | return px == 0;
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349 | }
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350 |
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351 | bool unique() const // never throws
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352 | {
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353 | return pn.unique();
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354 | }
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355 |
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356 | long use_count() const // never throws
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357 | {
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358 | return pn.use_count();
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359 | }
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360 |
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361 | void swap(shared_ptr<T> & other) // never throws
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362 | {
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363 | std::swap(px, other.px);
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364 | pn.swap(other.pn);
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365 | }
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366 |
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367 | template<class Y> bool _internal_less(shared_ptr<Y> const & rhs) const
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368 | {
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369 | return pn < rhs.pn;
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370 | }
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371 |
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372 | void * _internal_get_deleter(std::type_info const & ti) const
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373 | {
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374 | return pn.get_deleter(ti);
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375 | }
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376 |
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377 | // Tasteless as this may seem, making all members public allows member templates
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378 | // to work in the absence of member template friends. (Matthew Langston)
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379 |
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380 | #ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS
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381 |
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382 | private:
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383 |
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384 | template<class Y> friend class shared_ptr;
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385 | template<class Y> friend class weak_ptr;
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386 |
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387 |
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388 | #endif
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389 |
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390 | T * px; // contained pointer
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391 | boost::detail::shared_count pn; // reference counter
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392 |
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393 | }; // shared_ptr
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394 |
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395 | template<class T, class U> inline bool operator==(shared_ptr<T> const & a, shared_ptr<U> const & b)
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396 | {
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397 | return a.get() == b.get();
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398 | }
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399 |
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400 | template<class T, class U> inline bool operator!=(shared_ptr<T> const & a, shared_ptr<U> const & b)
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401 | {
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402 | return a.get() != b.get();
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403 | }
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404 |
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405 | #if __GNUC__ == 2 && __GNUC_MINOR__ <= 96
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406 |
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407 | // Resolve the ambiguity between our op!= and the one in rel_ops
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408 |
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409 | template<class T> inline bool operator!=(shared_ptr<T> const & a, shared_ptr<T> const & b)
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410 | {
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411 | return a.get() != b.get();
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412 | }
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413 |
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414 | #endif
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415 |
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416 | template<class T, class U> inline bool operator<(shared_ptr<T> const & a, shared_ptr<U> const & b)
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417 | {
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418 | return a._internal_less(b);
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419 | }
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420 |
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421 | template<class T> inline void swap(shared_ptr<T> & a, shared_ptr<T> & b)
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422 | {
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423 | a.swap(b);
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424 | }
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425 |
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426 | template<class T, class U> shared_ptr<T> static_pointer_cast(shared_ptr<U> const & r)
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427 | {
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428 | return shared_ptr<T>(r, boost::detail::static_cast_tag());
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429 | }
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430 |
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431 | template<class T, class U> shared_ptr<T> const_pointer_cast(shared_ptr<U> const & r)
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432 | {
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433 | return shared_ptr<T>(r, boost::detail::const_cast_tag());
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434 | }
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435 |
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436 | template<class T, class U> shared_ptr<T> dynamic_pointer_cast(shared_ptr<U> const & r)
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437 | {
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438 | return shared_ptr<T>(r, boost::detail::dynamic_cast_tag());
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439 | }
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440 |
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441 | // shared_*_cast names are deprecated. Use *_pointer_cast instead.
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442 |
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443 | template<class T, class U> shared_ptr<T> shared_static_cast(shared_ptr<U> const & r)
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444 | {
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445 | return shared_ptr<T>(r, boost::detail::static_cast_tag());
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446 | }
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447 |
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448 | template<class T, class U> shared_ptr<T> shared_dynamic_cast(shared_ptr<U> const & r)
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449 | {
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450 | return shared_ptr<T>(r, boost::detail::dynamic_cast_tag());
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451 | }
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452 |
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453 | template<class T, class U> shared_ptr<T> shared_polymorphic_cast(shared_ptr<U> const & r)
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454 | {
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455 | return shared_ptr<T>(r, boost::detail::polymorphic_cast_tag());
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456 | }
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457 |
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458 | template<class T, class U> shared_ptr<T> shared_polymorphic_downcast(shared_ptr<U> const & r)
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459 | {
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460 | BOOST_ASSERT(dynamic_cast<T *>(r.get()) == r.get());
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461 | return shared_static_cast<T>(r);
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462 | }
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463 |
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464 | // get_pointer() enables boost::mem_fn to recognize shared_ptr
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465 |
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466 | template<class T> inline T * get_pointer(shared_ptr<T> const & p)
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467 | {
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468 | return p.get();
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469 | }
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470 |
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471 | // operator<<
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472 |
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473 | #if defined(__GNUC__) && (__GNUC__ < 3)
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474 |
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475 | template<class Y> std::ostream & operator<< (std::ostream & os, shared_ptr<Y> const & p)
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476 | {
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477 | os << p.get();
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478 | return os;
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479 | }
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480 |
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481 | #else
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482 |
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483 | # if defined(BOOST_MSVC) && BOOST_WORKAROUND(BOOST_MSVC, < 1300 && __SGI_STL_PORT)
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484 | // MSVC6 has problems finding std::basic_ostream through the using declaration in namespace _STL
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485 | using std::basic_ostream;
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486 | template<class E, class T, class Y> basic_ostream<E, T> & operator<< (basic_ostream<E, T> & os, shared_ptr<Y> const & p)
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487 | # else
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488 | template<class E, class T, class Y> std::basic_ostream<E, T> & operator<< (std::basic_ostream<E, T> & os, shared_ptr<Y> const & p)
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489 | # endif
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490 | {
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491 | os << p.get();
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492 | return os;
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493 | }
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494 |
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495 | #endif
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496 |
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497 | // get_deleter (experimental)
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498 |
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499 | #if ( defined(__GNUC__) && BOOST_WORKAROUND(__GNUC__, < 3) ) || \
|
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500 | ( defined(__EDG_VERSION__) && BOOST_WORKAROUND(__EDG_VERSION__, <= 238) ) || \
|
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501 | ( defined(__HP_aCC) && BOOST_WORKAROUND(__HP_aCC, <= 33500) )
|
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502 |
|
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503 | // g++ 2.9x doesn't allow static_cast<X const *>(void *)
|
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504 | // apparently EDG 2.38 and HP aCC A.03.35 also don't accept it
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505 |
|
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506 | template<class D, class T> D * get_deleter(shared_ptr<T> const & p)
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507 | {
|
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508 | void const * q = p._internal_get_deleter(typeid(D));
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509 | return const_cast<D *>(static_cast<D const *>(q));
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510 | }
|
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511 |
|
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512 | #else
|
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513 |
|
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514 | template<class D, class T> D * get_deleter(shared_ptr<T> const & p)
|
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515 | {
|
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516 | return static_cast<D *>(p._internal_get_deleter(typeid(D)));
|
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517 | }
|
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518 |
|
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519 | #endif
|
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520 |
|
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521 | } // namespace boost
|
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522 |
|
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523 | #ifdef BOOST_MSVC
|
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524 | # pragma warning(pop)
|
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525 | #endif
|
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526 |
|
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527 | #endif // #if defined(BOOST_NO_MEMBER_TEMPLATES) && !defined(BOOST_MSVC6_MEMBER_TEMPLATES)
|
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528 |
|
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529 | #endif // #ifndef BOOST_SHARED_PTR_HPP_INCLUDED
|
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