1 | #ifndef BOOST_SMART_PTR_SCOPED_PTR_HPP_INCLUDED |
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2 | #define BOOST_SMART_PTR_SCOPED_PTR_HPP_INCLUDED |
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3 | |
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4 | // (C) Copyright Greg Colvin and Beman Dawes 1998, 1999. |
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5 | // Copyright (c) 2001, 2002 Peter Dimov |
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6 | // |
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7 | // Distributed under the Boost Software License, Version 1.0. (See |
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8 | // accompanying file LICENSE_1_0.txt or copy at |
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9 | // http://www.boost.org/LICENSE_1_0.txt) |
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10 | // |
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11 | // http://www.boost.org/libs/smart_ptr/scoped_ptr.htm |
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12 | // |
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13 | |
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14 | #include <boost/assert.hpp> |
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15 | #include <boost/checked_delete.hpp> |
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16 | #include <boost/detail/workaround.hpp> |
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17 | |
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18 | #ifndef BOOST_NO_AUTO_PTR |
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19 | # include <memory> // for std::auto_ptr |
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20 | #endif |
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21 | |
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22 | namespace boost |
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23 | { |
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24 | |
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25 | // Debug hooks |
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26 | |
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27 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS) |
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28 | |
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29 | void sp_scalar_constructor_hook(void * p); |
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30 | void sp_scalar_destructor_hook(void * p); |
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31 | |
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32 | #endif |
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33 | |
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34 | // scoped_ptr mimics a built-in pointer except that it guarantees deletion |
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35 | // of the object pointed to, either on destruction of the scoped_ptr or via |
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36 | // an explicit reset(). scoped_ptr is a simple solution for simple needs; |
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37 | // use shared_ptr or std::auto_ptr if your needs are more complex. |
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38 | |
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39 | template<class T> class scoped_ptr // noncopyable |
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40 | { |
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41 | private: |
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42 | |
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43 | T * px; |
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44 | |
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45 | scoped_ptr(scoped_ptr const &); |
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46 | scoped_ptr & operator=(scoped_ptr const &); |
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47 | |
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48 | typedef scoped_ptr<T> this_type; |
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49 | |
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50 | void operator==( scoped_ptr const& ) const; |
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51 | void operator!=( scoped_ptr const& ) const; |
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52 | |
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53 | public: |
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54 | |
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55 | typedef T element_type; |
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56 | |
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57 | explicit scoped_ptr( T * p = 0 ): px( p ) // never throws |
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58 | { |
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59 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS) |
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60 | boost::sp_scalar_constructor_hook( px ); |
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61 | #endif |
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62 | } |
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63 | |
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64 | #ifndef BOOST_NO_AUTO_PTR |
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65 | |
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66 | explicit scoped_ptr( std::auto_ptr<T> p ): px( p.release() ) // never throws |
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67 | { |
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68 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS) |
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69 | boost::sp_scalar_constructor_hook( px ); |
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70 | #endif |
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71 | } |
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72 | |
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73 | #endif |
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74 | |
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75 | ~scoped_ptr() // never throws |
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76 | { |
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77 | #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS) |
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78 | boost::sp_scalar_destructor_hook( px ); |
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79 | #endif |
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80 | boost::checked_delete( px ); |
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81 | } |
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82 | |
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83 | void reset(T * p = 0) // never throws |
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84 | { |
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85 | BOOST_ASSERT( p == 0 || p != px ); // catch self-reset errors |
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86 | this_type(p).swap(*this); |
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87 | } |
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88 | |
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89 | T & operator*() const // never throws |
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90 | { |
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91 | BOOST_ASSERT( px != 0 ); |
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92 | return *px; |
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93 | } |
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94 | |
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95 | T * operator->() const // never throws |
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96 | { |
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97 | BOOST_ASSERT( px != 0 ); |
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98 | return px; |
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99 | } |
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100 | |
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101 | T * get() const // never throws |
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102 | { |
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103 | return px; |
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104 | } |
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105 | |
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106 | // implicit conversion to "bool" |
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107 | #include <boost/smart_ptr/detail/operator_bool.hpp> |
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108 | |
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109 | void swap(scoped_ptr & b) // never throws |
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110 | { |
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111 | T * tmp = b.px; |
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112 | b.px = px; |
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113 | px = tmp; |
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114 | } |
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115 | }; |
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116 | |
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117 | template<class T> inline void swap(scoped_ptr<T> & a, scoped_ptr<T> & b) // never throws |
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118 | { |
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119 | a.swap(b); |
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120 | } |
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121 | |
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122 | // get_pointer(p) is a generic way to say p.get() |
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123 | |
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124 | template<class T> inline T * get_pointer(scoped_ptr<T> const & p) |
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125 | { |
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126 | return p.get(); |
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127 | } |
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128 | |
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129 | } // namespace boost |
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130 | |
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131 | #endif // #ifndef BOOST_SMART_PTR_SCOPED_PTR_HPP_INCLUDED |
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