1 | //----------------------------------------------------------------------------- |
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2 | // boost variant/recursive_wrapper.hpp header file |
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3 | // See http://www.boost.org for updates, documentation, and revision history. |
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4 | //----------------------------------------------------------------------------- |
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5 | // |
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6 | // Copyright (c) 2002-2003 |
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7 | // Eric Friedman, Itay Maman |
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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 | #ifndef BOOST_VARIANT_RECURSIVE_WRAPPER_HPP |
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14 | #define BOOST_VARIANT_RECURSIVE_WRAPPER_HPP |
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15 | |
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16 | #include "boost/variant/recursive_wrapper_fwd.hpp" |
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17 | #include "boost/checked_delete.hpp" |
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18 | |
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19 | namespace boost { |
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20 | |
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21 | ////////////////////////////////////////////////////////////////////////// |
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22 | // class template recursive_wrapper |
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23 | // |
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24 | // See docs and recursive_wrapper_fwd.hpp for more information. |
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25 | // |
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26 | |
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27 | template <typename T> |
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28 | class recursive_wrapper |
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29 | { |
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30 | public: // typedefs |
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31 | |
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32 | typedef T type; |
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33 | |
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34 | private: // representation |
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35 | |
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36 | T* p_; |
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37 | |
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38 | public: // structors |
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39 | |
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40 | ~recursive_wrapper(); |
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41 | recursive_wrapper(); |
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42 | |
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43 | recursive_wrapper(const recursive_wrapper& operand); |
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44 | recursive_wrapper(const T& operand); |
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45 | |
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46 | private: // helpers, for modifiers (below) |
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47 | |
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48 | void assign(const T& rhs); |
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49 | |
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50 | public: // modifiers |
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51 | |
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52 | recursive_wrapper& operator=(const recursive_wrapper& rhs) |
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53 | { |
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54 | assign( rhs.get() ); |
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55 | return *this; |
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56 | } |
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57 | |
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58 | recursive_wrapper& operator=(const T& rhs) |
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59 | { |
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60 | assign( rhs ); |
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61 | return *this; |
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62 | } |
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63 | |
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64 | void swap(recursive_wrapper& operand) |
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65 | { |
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66 | T* temp = operand.p_; |
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67 | operand.p_ = p_; |
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68 | p_ = temp; |
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69 | } |
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70 | |
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71 | public: // queries |
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72 | |
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73 | T& get() { return *get_pointer(); } |
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74 | const T& get() const { return *get_pointer(); } |
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75 | |
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76 | T* get_pointer() { return p_; } |
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77 | const T* get_pointer() const { return p_; } |
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78 | |
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79 | }; |
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80 | |
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81 | template <typename T> |
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82 | recursive_wrapper<T>::~recursive_wrapper() |
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83 | { |
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84 | boost::checked_delete(p_); |
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85 | } |
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86 | |
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87 | template <typename T> |
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88 | recursive_wrapper<T>::recursive_wrapper() |
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89 | : p_(new T) |
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90 | { |
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91 | } |
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92 | |
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93 | template <typename T> |
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94 | recursive_wrapper<T>::recursive_wrapper(const recursive_wrapper& operand) |
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95 | : p_(new T( operand.get() )) |
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96 | { |
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97 | } |
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98 | |
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99 | template <typename T> |
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100 | recursive_wrapper<T>::recursive_wrapper(const T& operand) |
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101 | : p_(new T(operand)) |
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102 | { |
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103 | } |
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104 | |
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105 | template <typename T> |
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106 | void recursive_wrapper<T>::assign(const T& rhs) |
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107 | { |
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108 | this->get() = rhs; |
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109 | } |
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110 | |
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111 | // function template swap |
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112 | // |
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113 | // Swaps two recursive_wrapper<T> objects of the same type T. |
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114 | // |
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115 | template <typename T> |
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116 | inline void swap(recursive_wrapper<T>& lhs, recursive_wrapper<T>& rhs) |
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117 | { |
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118 | lhs.swap(rhs); |
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119 | } |
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120 | |
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121 | } // namespace boost |
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122 | |
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123 | #endif // BOOST_VARIANT_RECURSIVE_WRAPPER_HPP |
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