Marc Wäckerlin
15 years ago
parent
0871fd927f
commit
13c7266c9f
4 changed files with 264 additions and 39 deletions
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/*! @file
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@id $Id$ |
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taken from boost.org boost::Any |
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*/ |
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// 1 2 3 4 5 6 7 8
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// 45678901234567890123456789012345678901234567890123456789012345678901234567890
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// See http://www.boost.org/libs/any for Documentation.
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#ifndef XML_CXX_ANY_INCLUDED |
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#define XML_CXX_ANY_INCLUDED |
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#include <algorithm> |
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#include <typeinfo> |
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#include <stdexcept> |
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namespace xml { |
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class Any { |
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public: // structors
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Any(): content(0) {} |
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template<typename ValueType> Any(const ValueType& value): |
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content(new holder<ValueType>(value)) { |
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} |
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Any(const Any& other): content(other.content?other.content->clone():0) {} |
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~Any() { |
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delete content; |
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} |
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public: // modifiers
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Any& swap(Any& rhs) { |
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std::swap(content, rhs.content); |
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return *this; |
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} |
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template<typename ValueType> Any& operator=(const ValueType& rhs) { |
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Any(rhs).swap(*this); |
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return *this; |
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} |
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Any& operator=(const Any& rhs) { |
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Any(rhs).swap(*this); |
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return *this; |
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} |
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public: // queries
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bool empty() const { |
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return !content; |
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} |
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const std::type_info& type() const { |
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return content?content->type():typeid(void); |
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} |
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private: // types
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class placeholder { |
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public: // structors
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virtual ~placeholder() {} |
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virtual const std::type_info& type() const = 0; |
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virtual placeholder* clone() const = 0; |
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}; |
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template<typename ValueType> class holder: public placeholder { |
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public: |
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holder(const ValueType& value): held(value) {} |
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virtual const std::type_info& type() const { |
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return typeid(ValueType); |
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} |
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virtual placeholder* clone() const { |
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return new holder(held); |
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} |
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ValueType held; |
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}; |
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private: // representation
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template<typename ValueType> friend ValueType* any_cast(Any*); |
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template<typename ValueType> friend ValueType& any_cast(Any&); |
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placeholder* content; |
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}; |
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template<typename ValueType> ValueType* any_cast(Any* operand) { |
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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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template<typename ValueType> const ValueType* any_cast(const Any* operand) { |
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return any_cast<ValueType>(const_cast<Any*>(operand)); |
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} |
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template<typename ValueType> ValueType& any_cast(Any& operand) { |
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if (operand.type()==typeid(ValueType)) |
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return static_cast<Any::holder<ValueType>*>(operand.content)->held; |
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throw std::bad_cast(); |
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} |
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template<typename ValueType> const ValueType& any_cast(const Any& operand) { |
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return any_cast<ValueType>(const_cast<Any&>(operand)); |
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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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// http://www.boost.org/LICENSE_1_0.txt)
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// Boost Software License - Version 1.0 - August 17th, 2003
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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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// 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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// 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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#endif |
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