src/utils/any.hpp

/*
* Boost Software License - Version 1.0 - August 17th, 2003
* 
* Permission is hereby granted, free of charge, to any person or organization
* obtaining a copy of the software and accompanying documentation covered by
* this license (the "Software") to use, reproduce, display, distribute,
* execute, and transmit the Software, and to prepare derivative works of the
* Software, and to permit third-parties to whom the Software is furnished to
* do so, all subject to the following:

* The copyright notices in the Software and this entire statement, including
* the above license grant, this restriction and the following disclaimer,
* must be included in all copies of the Software, in whole or in part, and
* all derivative works of the Software, unless such copies or derivative
* works are solely in the form of machine-executable object code generated by
* a source language processor.

* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
* SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
* FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/

// See http://www.boost.org/libs/any for Documentation.

#ifndef BOOST_ANY_INCLUDED
#define BOOST_ANY_INCLUDED

// what:  variant type boost::any
// who:   contributed by Kevlin Henney,
//        with features contributed and bugs found by
//        Ed Brey, Mark Rodgers, Peter Dimov, and James Curran
// when:  July 2001
// where: tested with BCC 5.5, MSVC 6.0, and g++ 2.95

#include <algorithm>
#include <typeinfo>

namespace boost
{

    template<class E> inline void throw_exception(E const & e) {
        throw e;
    }

    class any
    {
    public: // structors

        any()
          : content(0)
        {
        }

        template<typename ValueType>
        any(const ValueType & value)
          : content(new holder<ValueType>(value))
        {
        }

        any(const any & other)
          : content(other.content ? other.content->clone() : 0)
        {
        }

        ~any()
        {
            delete content;
        }

    public: // modifiers

        any & swap(any & rhs)
        {
            std::swap(content, rhs.content);
            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 empty() const
        {
            return !content;
        }

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

//#ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS
//    private: // types
//#else
    public: // types (public so any_cast can be non-friend)
//#endif

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

        public: // queries

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

            virtual placeholder * clone() const = 0;
    
        };

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

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

        public: // queries

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

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

        public: // representation

            ValueType held;

        };

//#ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS
//
//    private: // representation
//
//        template<typename ValueType>
//        friend ValueType * any_cast(any *);
//
//#else
//
    public: // representation (public so any_cast can be non-friend)
//
//#endif

        placeholder * content;

    };

    class bad_any_cast : public std::bad_cast
    {
    public:
        virtual const char * what() const throw()
        {
            return "boost::bad_any_cast: "
                   "failed conversion using boost::any_cast";
        }
    };

    template<typename ValueType>
    ValueType * any_cast(any * operand)
    {
        return operand && operand->type() == typeid(ValueType)
                    ? &static_cast<any::holder<ValueType> *>(operand->content)->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)
            boost::throw_exception(bad_any_cast());
        return *result;
    }


    template<typename T> 
    bool equal_any_type(const any& operand) {

    }

}

// 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)

#endif
Revision:	280
Committed:	Wed Feb 2 23:12:01 2005 UTC (20 years, 9 months ago) by tim
File size:	5555 byte(s)
Log Message:	adding boost::any
#	User	Rev	Content
1	tim	280	/*
2			* Boost Software License - Version 1.0 - August 17th, 2003
3			*
4			* Permission is hereby granted, free of charge, to any person or organization
5			* obtaining a copy of the software and accompanying documentation covered by
6			* this license (the "Software") to use, reproduce, display, distribute,
7			* execute, and transmit the Software, and to prepare derivative works of the
8			* Software, and to permit third-parties to whom the Software is furnished to
9			* do so, all subject to the following:
10
11			* The copyright notices in the Software and this entire statement, including
12			* the above license grant, this restriction and the following disclaimer,
13			* must be included in all copies of the Software, in whole or in part, and
14			* all derivative works of the Software, unless such copies or derivative
15			* works are solely in the form of machine-executable object code generated by
16			* a source language processor.
17
18			* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19			* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20			* FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
21			* SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
22			* FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
23			* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
24			* DEALINGS IN THE SOFTWARE.
25			*/
26
27			// See http://www.boost.org/libs/any for Documentation.
28
29			#ifndef BOOST_ANY_INCLUDED
30			#define BOOST_ANY_INCLUDED
31
32			// what: variant type boost::any
33			// who: contributed by Kevlin Henney,
34			// with features contributed and bugs found by
35			// Ed Brey, Mark Rodgers, Peter Dimov, and James Curran
36			// when: July 2001
37			// where: tested with BCC 5.5, MSVC 6.0, and g++ 2.95
38
39			#include <algorithm>
40			#include <typeinfo>
41
42			namespace boost
43			{
44
45			template<class E> inline void throw_exception(E const & e) {
46			throw e;
47			}
48
49			class any
50			{
51			public: // structors
52
53			any()
54			: content(0)
55			{
56			}
57
58			template<typename ValueType>
59			any(const ValueType & value)
60			: content(new holder<ValueType>(value))
61			{
62			}
63
64			any(const any & other)
65			: content(other.content ? other.content->clone() : 0)
66			{
67			}
68
69			~any()
70			{
71			delete content;
72			}
73
74			public: // modifiers
75
76			any & swap(any & rhs)
77			{
78			std::swap(content, rhs.content);
79			return *this;
80			}
81
82			template<typename ValueType>
83			any & operator=(const ValueType & rhs)
84			{
85			any(rhs).swap(*this);
86			return *this;
87			}
88
89			any & operator=(const any & rhs)
90			{
91			any(rhs).swap(*this);
92			return *this;
93			}
94
95			public: // queries
96
97			bool empty() const
98			{
99			return !content;
100			}
101
102			const std::type_info & type() const
103			{
104			return content ? content->type() : typeid(void);
105			}
106
107			//#ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS
108			// private: // types
109			//#else
110			public: // types (public so any_cast can be non-friend)
111			//#endif
112
113			class placeholder
114			{
115			public: // structors
116
117			virtual ~placeholder()
118			{
119			}
120
121			public: // queries
122
123			virtual const std::type_info & type() const = 0;
124
125			virtual placeholder * clone() const = 0;
126
127			};
128
129			template<typename ValueType>
130			class holder : public placeholder
131			{
132			public: // structors
133
134			holder(const ValueType & value)
135			: held(value)
136			{
137			}
138
139			public: // queries
140
141			virtual const std::type_info & type() const
142			{
143			return typeid(ValueType);
144			}
145
146			virtual placeholder * clone() const
147			{
148			return new holder(held);
149			}
150
151			public: // representation
152
153			ValueType held;
154
155			};
156
157			//#ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS
158			//
159			// private: // representation
160			//
161			// template<typename ValueType>
162			// friend ValueType * any_cast(any *);
163			//
164			//#else
165			//
166			public: // representation (public so any_cast can be non-friend)
167			//
168			//#endif
169
170			placeholder * content;
171
172			};
173
174			class bad_any_cast : public std::bad_cast
175			{
176			public:
177			virtual const char * what() const throw()
178			{
179			return "boost::bad_any_cast: "
180			"failed conversion using boost::any_cast";
181			}
182			};
183
184			template<typename ValueType>
185			ValueType * any_cast(any * operand)
186			{
187			return operand && operand->type() == typeid(ValueType)
188			? &static_cast<any::holder<ValueType> *>(operand->content)->held
189			: 0;
190			}
191
192			template<typename ValueType>
193			const ValueType * any_cast(const any * operand)
194			{
195			return any_cast<ValueType>(const_cast<any *>(operand));
196			}
197
198			template<typename ValueType>
199			ValueType any_cast(const any & operand)
200			{
201			const ValueType * result = any_cast<ValueType>(&operand);
202			if(!result)
203			boost::throw_exception(bad_any_cast());
204			return *result;
205			}
206
207
208			template<typename T>
209			bool equal_any_type(const any& operand) {
210
211			}
212
213			}
214
215			// Copyright Kevlin Henney, 2000, 2001, 2002. All rights reserved.
216			//
217			// Distributed under the Boost Software License, Version 1.0. (See
218			// accompanying file LICENSE_1_0.txt or copy at
219			// http://www.boost.org/LICENSE_1_0.txt)
220
221			#endif