1 | /* |
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2 | ----------------------------------------------------------------------------- |
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3 | This source file is part of OGRE |
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4 | (Object-oriented Graphics Rendering Engine) |
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5 | For the latest info, see http://www.ogre3d.org/ |
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6 | |
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7 | Copyright (c) 2000-2006 Torus Knot Software Ltd |
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8 | Also see acknowledgements in Readme.html |
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9 | |
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10 | This program is free software; you can redistribute it and/or modify it under |
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11 | the terms of the GNU Lesser General Public License as published by the Free Software |
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12 | Foundation; either version 2 of the License, or (at your option) Any later |
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13 | version. |
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14 | |
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15 | This program is distributed in the hope that it will be useful, but WITHOUT |
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16 | Any WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
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17 | FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. |
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18 | |
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19 | You should have received a copy of the GNU Lesser General Public License along with |
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20 | this program; if not, write to the Free Software Foundation, Inc., 59 Temple |
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21 | Place - Suite 330, Boston, MA 02111-1307, USA, or go to |
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22 | http://www.gnu.org/copyleft/lesser.txt. |
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23 | |
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24 | You may alternatively use this source under the terms of a specific version of |
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25 | the OGRE Unrestricted License provided you have obtained such a license from |
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26 | Torus Knot Software Ltd. |
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27 | ----------------------------------------------------------------------------- |
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28 | */ |
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29 | // -- Based on boost::any, original copyright information follows -- |
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30 | // Copyright Kevlin Henney, 2000, 2001, 2002. All rights reserved. |
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31 | // |
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32 | // Distributed under the Boost Software License, Version 1.0. (See |
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33 | // accompAnying file LICENSE_1_0.txt or copy at |
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34 | // http://www.boost.org/LICENSE_1_0.txt) |
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35 | // -- End original copyright -- |
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36 | |
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37 | #ifndef __OGRE_ANY_H__ |
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38 | #define __OGRE_ANY_H__ |
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39 | |
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40 | #include "OgrePrerequisites.h" |
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41 | #include "OgreException.h" |
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42 | #include "OgreString.h" |
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43 | #include <algorithm> |
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44 | #include <typeinfo> |
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45 | |
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46 | |
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47 | namespace Ogre |
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48 | { |
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49 | /** Variant type that can hold Any other type. |
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50 | */ |
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51 | class Any |
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52 | { |
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53 | public: // constructors |
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54 | |
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55 | Any() |
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56 | : mContent(0) |
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57 | { |
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58 | } |
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59 | |
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60 | template<typename ValueType> |
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61 | explicit Any(const ValueType & value) |
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62 | : mContent(new holder<ValueType>(value)) |
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63 | { |
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64 | } |
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65 | |
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66 | Any(const Any & other) |
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67 | : mContent(other.mContent ? other.mContent->clone() : 0) |
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68 | { |
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69 | } |
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70 | |
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71 | virtual ~Any() |
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72 | { |
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73 | delete mContent; |
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74 | } |
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75 | |
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76 | public: // modifiers |
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77 | |
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78 | Any& swap(Any & rhs) |
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79 | { |
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80 | std::swap(mContent, rhs.mContent); |
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81 | return *this; |
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82 | } |
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83 | |
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84 | template<typename ValueType> |
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85 | Any& operator=(const ValueType & rhs) |
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86 | { |
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87 | Any(rhs).swap(*this); |
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88 | return *this; |
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89 | } |
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90 | |
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91 | Any & operator=(const Any & rhs) |
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92 | { |
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93 | Any(rhs).swap(*this); |
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94 | return *this; |
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95 | } |
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96 | |
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97 | public: // queries |
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98 | |
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99 | bool isEmpty() const |
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100 | { |
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101 | return !mContent; |
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102 | } |
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103 | |
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104 | const std::type_info& getType() const |
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105 | { |
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106 | return mContent ? mContent->getType() : typeid(void); |
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107 | } |
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108 | |
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109 | inline friend std::ostream& operator << |
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110 | ( std::ostream& o, const Any& v ) |
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111 | { |
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112 | if (v.mContent) |
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113 | v.mContent->writeToStream(o); |
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114 | return o; |
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115 | } |
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116 | |
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117 | |
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118 | protected: // types |
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119 | |
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120 | class placeholder |
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121 | { |
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122 | public: // structors |
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123 | |
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124 | virtual ~placeholder() |
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125 | { |
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126 | } |
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127 | |
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128 | public: // queries |
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129 | |
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130 | virtual const std::type_info& getType() const = 0; |
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131 | |
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132 | virtual placeholder * clone() const = 0; |
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133 | |
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134 | virtual void writeToStream(std::ostream& o) = 0; |
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135 | |
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136 | }; |
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137 | |
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138 | template<typename ValueType> |
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139 | class holder : public placeholder |
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140 | { |
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141 | public: // structors |
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142 | |
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143 | holder(const ValueType & value) |
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144 | : held(value) |
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145 | { |
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146 | } |
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147 | |
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148 | public: // queries |
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149 | |
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150 | virtual const std::type_info & getType() const |
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151 | { |
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152 | return typeid(ValueType); |
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153 | } |
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154 | |
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155 | virtual placeholder * clone() const |
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156 | { |
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157 | return new holder(held); |
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158 | } |
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159 | |
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160 | virtual void writeToStream(std::ostream& o) |
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161 | { |
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162 | o << held; |
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163 | } |
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164 | |
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165 | |
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166 | public: // representation |
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167 | |
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168 | ValueType held; |
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169 | |
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170 | }; |
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171 | |
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172 | |
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173 | |
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174 | protected: // representation |
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175 | placeholder * mContent; |
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176 | |
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177 | template<typename ValueType> |
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178 | friend ValueType * any_cast(Any *); |
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179 | |
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180 | |
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181 | public: |
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182 | |
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183 | template<typename ValueType> |
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184 | ValueType operator()() const |
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185 | { |
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186 | if (!mContent) |
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187 | { |
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188 | OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS, |
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189 | "Bad cast from uninitialised Any", |
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190 | "Any::operator()"); |
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191 | } |
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192 | else if(getType() == typeid(ValueType)) |
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193 | { |
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194 | return static_cast<Any::holder<ValueType> *>(mContent)->held; |
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195 | } |
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196 | else |
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197 | { |
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198 | StringUtil::StrStreamType str; |
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199 | str << "Bad cast from type '" << getType().name() << "' " |
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200 | << "to '" << typeid(ValueType).name() << "'"; |
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201 | OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS, |
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202 | str.str(), |
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203 | "Any::operator()"); |
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204 | } |
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205 | } |
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206 | |
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207 | |
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208 | |
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209 | }; |
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210 | |
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211 | |
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212 | /** Specialised Any class which has built in arithmetic operators, but can |
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213 | hold only types which support operator +,-,* and / . |
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214 | */ |
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215 | class AnyNumeric : public Any |
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216 | { |
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217 | public: |
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218 | AnyNumeric() |
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219 | : Any() |
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220 | { |
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221 | } |
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222 | |
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223 | template<typename ValueType> |
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224 | AnyNumeric(const ValueType & value) |
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225 | |
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226 | { |
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227 | mContent = new numholder<ValueType>(value); |
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228 | } |
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229 | |
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230 | AnyNumeric(const AnyNumeric & other) |
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231 | : Any() |
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232 | { |
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233 | mContent = other.mContent ? other.mContent->clone() : 0; |
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234 | } |
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235 | protected: |
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236 | class numplaceholder : public Any::placeholder |
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237 | { |
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238 | public: // structors |
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239 | |
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240 | ~numplaceholder() |
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241 | { |
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242 | } |
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243 | virtual placeholder* add(placeholder* rhs) = 0; |
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244 | virtual placeholder* subtract(placeholder* rhs) = 0; |
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245 | virtual placeholder* multiply(placeholder* rhs) = 0; |
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246 | virtual placeholder* multiply(Real factor) = 0; |
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247 | virtual placeholder* divide(placeholder* rhs) = 0; |
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248 | }; |
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249 | |
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250 | template<typename ValueType> |
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251 | class numholder : public numplaceholder |
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252 | { |
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253 | public: // structors |
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254 | |
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255 | numholder(const ValueType & value) |
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256 | : held(value) |
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257 | { |
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258 | } |
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259 | |
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260 | public: // queries |
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261 | |
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262 | virtual const std::type_info & getType() const |
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263 | { |
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264 | return typeid(ValueType); |
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265 | } |
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266 | |
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267 | virtual placeholder * clone() const |
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268 | { |
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269 | return new numholder(held); |
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270 | } |
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271 | |
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272 | virtual placeholder* add(placeholder* rhs) |
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273 | { |
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274 | return new numholder(held + static_cast<numholder*>(rhs)->held); |
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275 | } |
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276 | virtual placeholder* subtract(placeholder* rhs) |
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277 | { |
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278 | return new numholder(held - static_cast<numholder*>(rhs)->held); |
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279 | } |
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280 | virtual placeholder* multiply(placeholder* rhs) |
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281 | { |
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282 | return new numholder(held * static_cast<numholder*>(rhs)->held); |
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283 | } |
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284 | virtual placeholder* multiply(Real factor) |
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285 | { |
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286 | return new numholder(held * factor); |
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287 | } |
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288 | virtual placeholder* divide(placeholder* rhs) |
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289 | { |
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290 | return new numholder(held / static_cast<numholder*>(rhs)->held); |
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291 | } |
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292 | virtual void writeToStream(std::ostream& o) |
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293 | { |
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294 | o << held; |
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295 | } |
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296 | |
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297 | public: // representation |
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298 | |
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299 | ValueType held; |
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300 | |
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301 | }; |
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302 | |
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303 | /// Construct from holder |
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304 | AnyNumeric(placeholder* pholder) |
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305 | { |
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306 | mContent = pholder; |
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307 | } |
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308 | |
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309 | public: |
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310 | AnyNumeric & operator=(const AnyNumeric & rhs) |
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311 | { |
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312 | AnyNumeric(rhs).swap(*this); |
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313 | return *this; |
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314 | } |
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315 | AnyNumeric operator+(const AnyNumeric& rhs) const |
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316 | { |
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317 | return AnyNumeric( |
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318 | static_cast<numplaceholder*>(mContent)->add(rhs.mContent)); |
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319 | } |
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320 | AnyNumeric operator-(const AnyNumeric& rhs) const |
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321 | { |
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322 | return AnyNumeric( |
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323 | static_cast<numplaceholder*>(mContent)->subtract(rhs.mContent)); |
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324 | } |
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325 | AnyNumeric operator*(const AnyNumeric& rhs) const |
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326 | { |
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327 | return AnyNumeric( |
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328 | static_cast<numplaceholder*>(mContent)->multiply(rhs.mContent)); |
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329 | } |
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330 | AnyNumeric operator*(Real factor) const |
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331 | { |
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332 | return AnyNumeric( |
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333 | static_cast<numplaceholder*>(mContent)->multiply(factor)); |
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334 | } |
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335 | AnyNumeric operator/(const AnyNumeric& rhs) const |
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336 | { |
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337 | return AnyNumeric( |
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338 | static_cast<numplaceholder*>(mContent)->divide(rhs.mContent)); |
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339 | } |
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340 | AnyNumeric& operator+=(const AnyNumeric& rhs) |
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341 | { |
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342 | *this = AnyNumeric( |
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343 | static_cast<numplaceholder*>(mContent)->add(rhs.mContent)); |
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344 | return *this; |
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345 | } |
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346 | AnyNumeric& operator-=(const AnyNumeric& rhs) |
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347 | { |
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348 | *this = AnyNumeric( |
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349 | static_cast<numplaceholder*>(mContent)->subtract(rhs.mContent)); |
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350 | return *this; |
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351 | } |
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352 | AnyNumeric& operator*=(const AnyNumeric& rhs) |
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353 | { |
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354 | *this = AnyNumeric( |
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355 | static_cast<numplaceholder*>(mContent)->multiply(rhs.mContent)); |
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356 | return *this; |
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357 | } |
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358 | AnyNumeric& operator/=(const AnyNumeric& rhs) |
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359 | { |
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360 | *this = AnyNumeric( |
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361 | static_cast<numplaceholder*>(mContent)->divide(rhs.mContent)); |
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362 | return *this; |
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363 | } |
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364 | |
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365 | |
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366 | |
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367 | |
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368 | }; |
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369 | |
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370 | |
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371 | template<typename ValueType> |
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372 | ValueType * any_cast(Any * operand) |
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373 | { |
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374 | return operand && operand->getType() == typeid(ValueType) |
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375 | ? &static_cast<Any::holder<ValueType> *>(operand->mContent)->held |
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376 | : 0; |
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377 | } |
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378 | |
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379 | template<typename ValueType> |
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380 | const ValueType * any_cast(const Any * operand) |
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381 | { |
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382 | return any_cast<ValueType>(const_cast<Any *>(operand)); |
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383 | } |
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384 | |
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385 | template<typename ValueType> |
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386 | ValueType any_cast(const Any & operand) |
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387 | { |
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388 | const ValueType * result = any_cast<ValueType>(&operand); |
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389 | if(!result) |
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390 | { |
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391 | StringUtil::StrStreamType str; |
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392 | str << "Bad cast from type '" << operand.getType().name() << "' " |
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393 | << "to '" << typeid(ValueType).name() << "'"; |
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394 | OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS, |
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395 | str.str(), |
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396 | "Ogre::any_cast"); |
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397 | } |
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398 | return *result; |
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399 | } |
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400 | |
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401 | |
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402 | } |
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403 | |
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404 | #endif |
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405 | |
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