OgreAny.h

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/*
-----------------------------------------------------------------------------
This source file is part of OGRE
    (Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org/

Copyright (c) 2000-2005 The OGRE Team
Also see acknowledgements in Readme.html

This program is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the Free Software
Foundation; either version 2 of the License, or (at your option) Any later
version.

This program is distributed in the hope that it will be useful, but WITHOUT
Any WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place - Suite 330, Boston, MA 02111-1307, USA, or go to
http://www.gnu.org/copyleft/lesser.txt.
-----------------------------------------------------------------------------
*/
// -- Based on boost::any, original copyright information follows --
// Copyright Kevlin Henney, 2000, 2001, 2002. All rights reserved.
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompAnying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
// -- End original copyright --

#ifndef __OGRE_ANY_H__
#define __OGRE_ANY_H__

#include "OgrePrerequisites.h"
#include "OgreException.h"
#include "OgreString.h"
#include <algorithm>
#include <typeinfo>


namespace Ogre
{
    class Any
    {
    public: // constructors

        Any()
          : mContent(0)
        {
        }

        template<typename ValueType>
        explicit Any(const ValueType & value)
          : mContent(new holder<ValueType>(value))
        {
        }

        Any(const Any & other)
          : mContent(other.mContent ? other.mContent->clone() : 0)
        {
        }

        virtual ~Any()
        {
            delete mContent;
        }

    public: // modifiers

        Any& swap(Any & rhs)
        {
            std::swap(mContent, rhs.mContent);
            return *this;
        }

        template<typename ValueType>
        Any& operator=(const ValueType & rhs)
        {
            Any(rhs).swap(*this);
            return *this;
        }

        Any & operator=(const Any & rhs)
        {
            Any(rhs).swap(*this);
            return *this;
        }

    public: // queries

        bool isEmpty() const
        {
            return !mContent;
        }

        const std::type_info& getType() const
        {
            return mContent ? mContent->getType() : typeid(void);
        }

        inline friend std::ostream& operator <<
            ( std::ostream& o, const Any& v )
        {
            if (v.mContent)
                v.mContent->writeToStream(o);
            return o;
        }


    protected: // types

        class placeholder
        {
        public: // structors
    
            virtual ~placeholder()
            {
            }

        public: // queries

            virtual const std::type_info& getType() const = 0;

            virtual placeholder * clone() const = 0;
    
            virtual void writeToStream(std::ostream& o) = 0;

        };

        template<typename ValueType>
        class holder : public placeholder
        {
        public: // structors

            holder(const ValueType & value)
              : held(value)
            {
            }

        public: // queries

            virtual const std::type_info & getType() const
            {
                return typeid(ValueType);
            }

            virtual placeholder * clone() const
            {
                return new holder(held);
            }

            virtual void writeToStream(std::ostream& o)
            {
                o << held;
            }


        public: // representation

            ValueType held;

        };



    protected: // representation
        placeholder * mContent;

        template<typename ValueType>
        friend ValueType * any_cast(Any *);


    public: 

        template<typename ValueType>
        ValueType operator()() const
        {
            if (!mContent) 
            {
                OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS,
                    "Bad cast from uninitialised Any", 
                    "Any::operator()");
            }
            else if(getType() == typeid(ValueType))
            {
                return static_cast<Any::holder<ValueType> *>(mContent)->held;
            }
            else
            {
                StringUtil::StrStreamType str;
                str << "Bad cast from type '" << getType().name() << "' "
                    << "to '" << typeid(ValueType).name() << "'";
                OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS,
                     str.str(), 
                    "Any::operator()");
            }
        }

        

    };


    class AnyNumeric : public Any
    {
    public:
        AnyNumeric()
        : Any()
        {
        }

        template<typename ValueType>
        AnyNumeric(const ValueType & value)
            
        {
            mContent = new numholder<ValueType>(value);
        }

        AnyNumeric(const AnyNumeric & other)
            : Any()
        {
            mContent = other.mContent ? other.mContent->clone() : 0; 
        }
    protected:
        class numplaceholder : public Any::placeholder
        {
        public: // structors

            ~numplaceholder()
            {
            }
            virtual placeholder* add(placeholder* rhs) = 0;
            virtual placeholder* subtract(placeholder* rhs) = 0;
            virtual placeholder* multiply(placeholder* rhs) = 0;
            virtual placeholder* multiply(Real factor) = 0;
            virtual placeholder* divide(placeholder* rhs) = 0;
        };

        template<typename ValueType>
        class numholder : public numplaceholder
        {
        public: // structors

            numholder(const ValueType & value)
                : held(value)
            {
            }

        public: // queries

            virtual const std::type_info & getType() const
            {
                return typeid(ValueType);
            }

            virtual placeholder * clone() const
            {
                return new numholder(held);
            }

            virtual placeholder* add(placeholder* rhs)
            {
                return new numholder(held + static_cast<numholder*>(rhs)->held);
            }
            virtual placeholder* subtract(placeholder* rhs)
            {
                return new numholder(held - static_cast<numholder*>(rhs)->held);
            }
            virtual placeholder* multiply(placeholder* rhs)
            {
                return new numholder(held * static_cast<numholder*>(rhs)->held);
            }
            virtual placeholder* multiply(Real factor)
            {
                return new numholder(held * factor);
            }
            virtual placeholder* divide(placeholder* rhs)
            {
                return new numholder(held / static_cast<numholder*>(rhs)->held);
            }
            virtual void writeToStream(std::ostream& o)
            {
                o << held;
            }

        public: // representation

            ValueType held;

        };

        AnyNumeric(placeholder* pholder)
        {
            mContent = pholder;
        }

    public:
        AnyNumeric & operator=(const AnyNumeric & rhs)
        {
            AnyNumeric(rhs).swap(*this);
            return *this;
        }
        AnyNumeric operator+(const AnyNumeric& rhs) const
        {
            return AnyNumeric(
                static_cast<numplaceholder*>(mContent)->add(rhs.mContent));
        }
        AnyNumeric operator-(const AnyNumeric& rhs) const
        {
            return AnyNumeric(
                static_cast<numplaceholder*>(mContent)->subtract(rhs.mContent));
        }
        AnyNumeric operator*(const AnyNumeric& rhs) const
        {
            return AnyNumeric(
                static_cast<numplaceholder*>(mContent)->multiply(rhs.mContent));
        }
        AnyNumeric operator*(Real factor) const
        {
            return AnyNumeric(
                static_cast<numplaceholder*>(mContent)->multiply(factor));
        }
        AnyNumeric operator/(const AnyNumeric& rhs) const
        {
            return AnyNumeric(
                static_cast<numplaceholder*>(mContent)->divide(rhs.mContent));
        }
        AnyNumeric& operator+=(const AnyNumeric& rhs)
        {
            *this = AnyNumeric(
                static_cast<numplaceholder*>(mContent)->add(rhs.mContent));
            return *this;
        }
        AnyNumeric& operator-=(const AnyNumeric& rhs)
        {
            *this = AnyNumeric(
                static_cast<numplaceholder*>(mContent)->subtract(rhs.mContent));
            return *this;
        }
        AnyNumeric& operator*=(const AnyNumeric& rhs)
        {
            *this = AnyNumeric(
                static_cast<numplaceholder*>(mContent)->multiply(rhs.mContent));
            return *this;
        }
        AnyNumeric& operator/=(const AnyNumeric& rhs)
        {
            *this = AnyNumeric(
                static_cast<numplaceholder*>(mContent)->divide(rhs.mContent));
            return *this;
        }




    };


    template<typename ValueType>
    ValueType * any_cast(Any * operand)
    {
        return operand && operand->getType() == typeid(ValueType)
                    ? &static_cast<Any::holder<ValueType> *>(operand->mContent)->held
                    : 0;
    }

    template<typename ValueType>
    const ValueType * any_cast(const Any * operand)
    {
        return any_cast<ValueType>(const_cast<Any *>(operand));
    }

    template<typename ValueType>
    ValueType any_cast(const Any & operand)
    {
        const ValueType * result = any_cast<ValueType>(&operand);
        if(!result)
        {
            StringUtil::StrStreamType str;
            str << "Bad cast from type '" << operand.getType().name() << "' "
                << "to '" << typeid(ValueType).name() << "'";
            OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS,
                str.str(), 
                "Ogre::any_cast");
        }
        return *result;
    }


}

#endif

---

Copyright © 2000-2005 by The OGRE Team

This work is licensed under a Creative Commons Attribution-ShareAlike 2.5 License.
Last modified Sun Mar 12 14:37:36 2006