1 | #ifndef VFACADE_HPP_
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2 | #define VFACADE_HPP_
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3 |
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4 | #include <iostream>
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5 | #include <typeinfo>
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6 |
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7 | #include <assert.h>
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8 | #include <memory.h>
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9 |
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10 | /**
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11 | * TODO: Doc
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12 | *
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13 | * @author Sebastian Mies <mies@tm.uka.de>
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14 | */
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15 | /// the virtual object adaptor class
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16 | template<class NonVirtual, class Virtual, class Adaptor>
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17 | class vobject_hull : public Virtual {
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18 | };
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19 |
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20 | /**
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21 | * TODO: Doc
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22 | *
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23 | * @author Sebastian Mies <mies@tm.uka.de>
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24 | */
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25 | /// the vfacade adaptor type
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26 | struct vfacade_adaptor_type {
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27 | template<class NonVirtual>
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28 | class adaptor_type {
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29 | private:
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30 | NonVirtual* obj_;
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31 | public:
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32 | explicit inline adaptor_type() :
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33 | obj_() {
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34 | }
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35 | explicit inline adaptor_type(NonVirtual& obj) :
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36 | obj_(&obj) {
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37 | }
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38 | explicit inline adaptor_type(const NonVirtual& obj) :
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39 | obj_(&obj) {
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40 | }
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41 | inline void set(NonVirtual& obj) {
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42 | obj_ = &obj;
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43 | }
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44 | inline NonVirtual* operator->() {
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45 | return obj_;
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46 | }
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47 | inline const NonVirtual* operator->() const {
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48 | return obj_;
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49 | }
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50 | inline const NonVirtual& operator*() const {
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51 | return *obj_;
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52 | }
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53 | inline NonVirtual& operator*() {
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54 | return *obj_;
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55 | }
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56 | };
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57 | };
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58 |
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59 | /**
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60 | * TODO: Doc
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61 | *
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62 | * @author Sebastian Mies <mies@tm.uka.de>
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63 | */
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64 | /// the virtual capsule adaptor type
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65 | struct vcapsule_adaptor_type {
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66 | template<class NonVirtual>
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67 | class adaptor_type {
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68 | private:
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69 | NonVirtual obj_;
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70 | public:
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71 | inline adaptor_type() :
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72 | obj_() {
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73 | }
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74 | inline adaptor_type(const NonVirtual& obj) :
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75 | obj_(obj) {
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76 | }
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77 | inline void assign(const NonVirtual& obj) {
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78 | obj_ = obj;
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79 | }
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80 | inline NonVirtual* operator->() {
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81 | return &obj_;
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82 | }
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83 | inline const NonVirtual* operator->() const {
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84 | return &obj_;
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85 | }
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86 | inline const NonVirtual& operator*() const {
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87 | return obj_;
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88 | }
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89 | inline NonVirtual& operator*() {
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90 | return obj_;
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91 | }
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92 | };
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93 | };
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94 |
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95 | /**
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96 | * TODO: Doc
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97 | *
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98 | * @author Sebastian Mies <mies@tm.uka.de>
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99 | */
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100 | /// placeholder
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101 | class vfacade_no_class {};
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102 |
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103 | /**
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104 | * TODO: Doc
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105 | *
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106 | * @author Sebastian Mies <mies@tm.uka.de>
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107 | */
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108 | /// a virtual fascade implementation
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109 | template<class Virtual, class Extension = vfacade_no_class>
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110 | class vfacade : public Extension {
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111 | public:
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112 | typedef vfacade<Virtual> self;
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113 |
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114 | private:
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115 | void* vtable;
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116 | void* vadaptor;
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117 |
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118 | template<class T>
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119 | void assign(T& obj) {
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120 | typedef vobject_hull<T, Virtual, vfacade_adaptor_type> adaptor_type;
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121 | adaptor_type adaptor(obj);
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122 | assert( sizeof(adaptor_type) == sizeof(vfacade) );
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123 | memcpy((void*) this, (void*) &adaptor, sizeof(vfacade));
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124 | }
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125 |
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126 | template<class T>
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127 | void assign(const T& obj) {
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128 | T& obj_ = *const_cast<T*>(&obj);
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129 | typedef vobject_hull<T, Virtual, vfacade_adaptor_type> adaptor_type;
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130 | adaptor_type adaptor(obj_);
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131 | assert( sizeof(adaptor_type) == sizeof(vfacade) );
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132 | memcpy((void*) this, (void*) &adaptor, sizeof(vfacade));
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133 | }
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134 |
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135 | void assign(self& copy) {
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136 | this->vtable = copy.vtable;
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137 | this->vadaptor = copy.vadaptor;
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138 | }
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139 |
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140 | void assign(const self& copy) {
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141 | this->vtable = copy.vtable;
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142 | this->vadaptor = copy.vadaptor;
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143 | }
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144 |
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145 | public:
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146 | /// constructs an undefined virtual facade
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147 | inline vfacade() {
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148 | this->vtable = NULL;
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149 | this->vadaptor = NULL;
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150 | }
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151 |
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152 | /// constructs an initialized virtual facade
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153 | template<class T>
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154 | inline vfacade(T& obj) {
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155 | assign(*const_cast<T*>(&obj));
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156 | }
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157 |
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158 | /// assigns a new object to this facade
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159 | template<class T>
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160 | inline self& operator=(T& obj) {
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161 | assign(obj);
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162 | return *this;
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163 | }
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164 |
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165 | /// returns true, if the facade is unassigned
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166 | inline bool is_null() const {
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167 | return this->vtable == NULL;
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168 | }
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169 |
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170 | inline operator Virtual* () {
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171 | assert(vtable!=NULL);
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172 | return (Virtual*) this;
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173 | }
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174 |
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175 | inline operator const Virtual* () const {
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176 | assert(vtable!=NULL);
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177 | return (const Virtual*) this;
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178 | }
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179 |
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180 | inline operator Virtual& () {
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181 | assert(vtable!=NULL);
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182 | return *(Virtual*) this;
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183 | }
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184 |
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185 | inline operator const Virtual& () const {
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186 | assert(vtable!=NULL);
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187 | return *(const Virtual*) this;
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188 | }
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189 |
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190 | /// returns the virtual object of the facade
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191 | inline Virtual* operator->() {
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192 | assert(vtable!=NULL);
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193 | return (Virtual*) this;
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194 | }
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195 |
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196 | /// returns a virtual object reference
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197 | inline Virtual& operator*() {
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198 | assert(vtable!=NULL);
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199 | return *((Virtual*) this);
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200 | }
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201 |
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202 | /// returns a virtual object reference
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203 | inline const Virtual& operator*() const {
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204 | assert(vtable!=NULL);
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205 | return *((const Virtual*) this);
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206 | }
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207 |
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208 | /// returns a constant virtual object of the facade
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209 | inline const Virtual* operator->() const {
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210 | assert(vtable!=NULL);
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211 | return (const Virtual*) this;
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212 | }
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213 | };
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214 |
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215 | /**
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216 | * TODO: Doc
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217 | *
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218 | * @author Sebastian Mies <mies@tm.uka.de>
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219 | */
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220 | /// creates a virtual capsule for an object
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221 | template<class Virtual, class NonVirtual>
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222 | Virtual* vcapsule(const NonVirtual& obj) {
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223 | return new vobject_hull<NonVirtual, Virtual, vcapsule_adaptor_type> (obj);
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224 | }
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225 |
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226 | /**
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227 | * TODO: Doc
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228 | *
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229 | * @author Sebastian Mies <mies@tm.uka.de>
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230 | */
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231 | /// returns the size in bytes of a virtual capsule
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232 | template<class Virtual, class NonVirtual>
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233 | size_t vcapsule_size(const NonVirtual& obj) {
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234 | return sizeof(vobject_hull<NonVirtual, Virtual, vcapsule_adaptor_type> (obj));
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235 | }
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236 |
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237 | #endif /* VFACADE_HPP_ */
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