[5] | 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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