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/* |
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* Boost Software License - Version 1.0 - August 17th, 2003 |
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* |
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* Permission is hereby granted, free of charge, to any person or organization |
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* obtaining a copy of the software and accompanying documentation covered by |
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* this license (the "Software") to use, reproduce, display, distribute, |
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* execute, and transmit the Software, and to prepare derivative works of the |
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* Software, and to permit third-parties to whom the Software is furnished to |
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* do so, all subject to the following: |
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|
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* The copyright notices in the Software and this entire statement, including |
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* the above license grant, this restriction and the following disclaimer, |
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* must be included in all copies of the Software, in whole or in part, and |
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* all derivative works of the Software, unless such copies or derivative |
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* works are solely in the form of machine-executable object code generated by |
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* a source language processor. |
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|
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT |
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* SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE |
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* FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE, |
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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* DEALINGS IN THE SOFTWARE. |
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*/ |
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|
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// See http://www.boost.org/libs/any for Documentation. |
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|
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#ifndef BOOST_ANY_INCLUDED |
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#define BOOST_ANY_INCLUDED |
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|
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// what: variant type boost::any |
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// who: contributed by Kevlin Henney, |
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// with features contributed and bugs found by |
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// Ed Brey, Mark Rodgers, Peter Dimov, and James Curran |
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// when: July 2001 |
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// where: tested with BCC 5.5, MSVC 6.0, and g++ 2.95 |
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|
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#include <algorithm> |
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#include <typeinfo> |
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|
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namespace boost |
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{ |
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|
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template<class E> inline void throw_exception(E const & e) { |
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throw e; |
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} |
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|
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class any |
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{ |
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public: // structors |
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|
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any() |
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: content(0) |
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{ |
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} |
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|
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template<typename ValueType> |
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any(const ValueType & value) |
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: content(new holder<ValueType>(value)) |
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{ |
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} |
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|
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any(const any & other) |
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: content(other.content ? other.content->clone() : 0) |
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{ |
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} |
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|
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~any() |
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{ |
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delete content; |
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} |
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|
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public: // modifiers |
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|
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any & swap(any & rhs) |
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{ |
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std::swap(content, rhs.content); |
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return *this; |
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} |
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|
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template<typename ValueType> |
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any & operator=(const ValueType & rhs) |
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{ |
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any(rhs).swap(*this); |
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return *this; |
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} |
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|
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any & operator=(const any & rhs) |
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{ |
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any(rhs).swap(*this); |
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return *this; |
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} |
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|
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public: // queries |
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|
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bool empty() const |
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{ |
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return !content; |
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} |
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|
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const std::type_info & type() const |
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{ |
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return content ? content->type() : typeid(void); |
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} |
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|
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//#ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS |
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// private: // types |
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//#else |
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public: // types (public so any_cast can be non-friend) |
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//#endif |
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|
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class placeholder |
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{ |
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public: // structors |
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|
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virtual ~placeholder() |
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{ |
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} |
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|
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public: // queries |
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|
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virtual const std::type_info & type() const = 0; |
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|
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virtual placeholder * clone() const = 0; |
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|
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}; |
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|
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template<typename ValueType> |
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class holder : public placeholder |
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{ |
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public: // structors |
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|
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holder(const ValueType & value) |
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: held(value) |
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{ |
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} |
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|
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public: // queries |
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|
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virtual const std::type_info & type() const |
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{ |
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return typeid(ValueType); |
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} |
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|
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virtual placeholder * clone() const |
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{ |
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return new holder(held); |
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} |
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|
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public: // representation |
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|
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ValueType held; |
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|
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}; |
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|
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//#ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS |
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// |
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// private: // representation |
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// |
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// template<typename ValueType> |
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// friend ValueType * any_cast(any *); |
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// |
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//#else |
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// |
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public: // representation (public so any_cast can be non-friend) |
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// |
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//#endif |
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|
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placeholder * content; |
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|
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}; |
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|
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class bad_any_cast : public std::bad_cast |
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{ |
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public: |
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virtual const char * what() const throw() |
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{ |
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return "boost::bad_any_cast: " |
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"failed conversion using boost::any_cast"; |
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} |
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}; |
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|
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template<typename ValueType> |
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ValueType * any_cast(any * operand) |
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{ |
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return operand && operand->type() == typeid(ValueType) |
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? &static_cast<any::holder<ValueType> *>(operand->content)->held |
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: 0; |
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} |
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|
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template<typename ValueType> |
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const ValueType * any_cast(const any * operand) |
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{ |
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return any_cast<ValueType>(const_cast<any *>(operand)); |
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} |
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|
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template<typename ValueType> |
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ValueType any_cast(const any & operand) |
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{ |
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const ValueType * result = any_cast<ValueType>(&operand); |
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if(!result) |
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boost::throw_exception(bad_any_cast()); |
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return *result; |
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} |
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|
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|
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// template<typename T> |
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// bool equal_any_type(const any& operand) { |
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// |
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// } |
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|
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} |
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|
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// Copyright Kevlin Henney, 2000, 2001, 2002. All rights reserved. |
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// |
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// Distributed under the Boost Software License, Version 1.0. (See |
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// accompanying file LICENSE_1_0.txt or copy at |
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// http://www.boost.org/LICENSE_1_0.txt) |
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|
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#endif |
