2012-04-29 20:52:25 +02:00
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//
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// Any.h
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//
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// $Id: //poco/1.4/Foundation/include/Poco/Any.h#1 $
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//
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// Library: Foundation
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// Package: Core
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2013-02-01 04:12:13 +01:00
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// Module: Any
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2012-04-29 20:52:25 +02:00
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//
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// Copyright Kevlin Henney, 2000, 2001, 2002. All rights reserved.
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// Extracted from Boost 1.33.1 lib and adapted for poco: Peter Schojer/AppliedInformatics 2006-02-02
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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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#ifndef Foundation_Any_INCLUDED
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#define Foundation_Any_INCLUDED
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#include "Poco/Exception.h"
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2013-02-03 03:37:39 +01:00
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#include "Poco/MetaProgramming.h"
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2012-04-29 20:52:25 +02:00
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#include <algorithm>
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#include <typeinfo>
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2013-02-04 05:39:09 +01:00
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#include <cstring>
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2012-04-29 20:52:25 +02:00
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namespace Poco {
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2013-02-06 05:12:21 +01:00
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namespace Dynamic {
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class Var;
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class VarHolder;
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template <class> class VarHolderImpl;
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}
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template <typename PlaceholderT, unsigned int SizeV = POCO_SMALL_OBJECT_SIZE>
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union Placeholder
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/// ValueHolder union (used by Poco::Any and Poco::Dynamic::Var for small
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/// object optimization).
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///
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/// If Holder<Type> fits into POCO_SMALL_OBJECT_SIZE bytes of storage,
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/// it will be placement-new-allocated into the local buffer
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/// (i.e. there will be no heap-allocation). The local buffer size is one byte
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/// larger - [POCO_SMALL_OBJECT_SIZE + 1], additional byte value indicating
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/// where the object was allocated (0 => heap, 1 => local).
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{
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public:
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struct Size
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{
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static const unsigned int value = SizeV;
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};
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Placeholder ()
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{
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erase();
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}
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void erase()
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{
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std::memset(holder, 0, sizeof(Placeholder));
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}
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bool isLocal() const
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{
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return holder[SizeV] != 0;
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}
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void setLocal(bool local) const
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{
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holder[SizeV] = local ? 1 : 0;
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}
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PlaceholderT* content() const
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{
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if(isLocal())
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return reinterpret_cast<PlaceholderT*>(holder);
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else
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return pHolder;
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}
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private:
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PlaceholderT* pHolder;
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mutable unsigned char holder[SizeV + 1];
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friend class Any;
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friend class Dynamic::Var;
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friend class Dynamic::VarHolder;
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template <class> friend class VarHolderImpl;
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};
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2012-04-29 20:52:25 +02:00
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class Any
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/// An Any class represents a general type and is capable of storing any type, supporting type-safe extraction
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/// of the internally stored data.
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///
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/// Code taken from the Boost 1.33.1 library. Original copyright by Kevlin Henney. Modified for Poco
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/// by Applied Informatics.
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///
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/// Modified for small object optimization support (optionally supported through conditional compilation)
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/// by Alex Fabijanic.
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2012-04-29 20:52:25 +02:00
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{
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public:
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2013-02-01 04:12:13 +01:00
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#ifndef POCO_NO_SOO
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Any()
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/// Creates an empty any type.
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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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/// Creates an any which stores the init parameter inside.
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///
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/// Example:
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/// Any a(13);
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/// Any a(string("12345"));
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{
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construct(value);
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}
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Any(const Any& other)
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/// Copy constructor, works with both empty and initialized Any values.
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{
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if ((this != &other) && !other.empty())
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construct(other);
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}
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~Any()
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/// Destructor. If Any is locally held, calls ValueHolder destructor;
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/// otherwise, deletes the placeholder from the heap.
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{
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if(!empty())
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{
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if(_valueHolder.isLocal())
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content()->~ValueHolder();
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else
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delete content();
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}
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}
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2013-02-03 03:37:39 +01:00
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Any& swap(Any& other)
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/// Swaps the content of the two Anys.
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///
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/// When small object optimizaton is enabled,
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/// swap is only exception-safe when both (*this and
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/// other) objects are allocated on the heap.
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{
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2013-02-03 19:03:01 +01:00
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if (this == &other) return *this;
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2013-02-06 05:12:21 +01:00
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if (!_valueHolder.isLocal() && !other._valueHolder.isLocal())
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{
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std::swap(_valueHolder.pHolder, other._valueHolder.pHolder);
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}
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else
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{
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Any tmp(*this);
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if (_valueHolder.isLocal()) this->~Any();
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construct(other);
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other = tmp;
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}
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return *this;
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}
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template<typename ValueType>
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Any & operator = (const ValueType& rhs)
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/// Assignment operator for all types != Any.
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///
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/// Example:
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/// Any a = 13;
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/// Any a = string("12345");
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{
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construct(rhs);
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return *this;
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}
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2013-02-03 19:03:01 +01:00
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Any& operator = (const Any& rhs)
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/// Assignment operator for Any.
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{
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if ((this != &rhs) && !rhs.empty())
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construct(rhs);
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else if ((this != &rhs) && rhs.empty())
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_valueHolder.erase();
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2013-02-03 19:03:01 +01:00
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return *this;
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}
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bool empty() const
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/// Returns true if the Any is empty.
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{
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2013-02-02 22:10:20 +01:00
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char buf[POCO_SMALL_OBJECT_SIZE] = { 0 };
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2013-02-06 05:56:03 +01:00
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return 0 == std::memcmp(_valueHolder.holder, buf, POCO_SMALL_OBJECT_SIZE);
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}
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const std::type_info & type() const
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/// Returns the type information of the stored content.
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/// If the Any is empty typeid(void) is returned.
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/// It is recommended to always query an Any for its type info before
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/// trying to extract data via an AnyCast/RefAnyCast.
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{
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return empty() ? typeid(void) : content()->type();
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}
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private:
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2013-02-06 05:12:21 +01:00
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class ValueHolder
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{
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public:
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virtual ~ValueHolder()
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{
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}
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2013-02-02 22:10:20 +01:00
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2013-02-01 04:12:13 +01:00
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virtual const std::type_info & type() const = 0;
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virtual void clone(Placeholder<ValueHolder>*) const = 0;
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};
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template<typename ValueType>
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class Holder : public ValueHolder
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{
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public:
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Holder(const ValueType & value) : _held(value)
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{
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}
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2013-02-02 22:10:20 +01:00
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2013-02-01 04:12:13 +01:00
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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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2013-02-02 22:10:20 +01:00
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2013-02-06 05:12:21 +01:00
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virtual void clone(Placeholder<ValueHolder>* pPlaceholder) const
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{
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if ((sizeof(Holder<ValueType>) <= POCO_SMALL_OBJECT_SIZE))
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{
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new ((ValueHolder*) pPlaceholder->holder) Holder(_held);
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pPlaceholder->setLocal(true);
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}
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else
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{
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pPlaceholder->pHolder = new Holder(_held);
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pPlaceholder->setLocal(false);
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}
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2013-02-01 04:12:13 +01:00
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}
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ValueType _held;
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private:
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Holder & operator = (const Holder &);
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};
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2013-02-06 05:12:21 +01:00
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ValueHolder* content() const
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{
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return _valueHolder.content();
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}
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template<typename ValueType>
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void construct(const ValueType& value)
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{
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if (sizeof(Holder<ValueType>) <= Placeholder<ValueType>::Size::value)
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{
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new (reinterpret_cast<ValueHolder*>(_valueHolder.holder)) Holder<ValueType>(value);
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_valueHolder.setLocal(true);
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}
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else
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{
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_valueHolder.pHolder = new Holder<ValueType>(value);
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_valueHolder.setLocal(false);
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2013-02-01 04:12:13 +01:00
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}
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}
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2013-02-02 22:10:20 +01:00
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2013-02-03 03:37:39 +01:00
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void construct(const Any& other)
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{
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if(!other.empty())
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other.content()->clone(&_valueHolder);
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else
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_valueHolder.erase();
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}
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Placeholder<ValueHolder> _valueHolder;
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#else // if POCO_NO_SOO
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Any(): _pHolder(0)
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/// Creates an empty any type.
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{
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}
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2012-04-29 20:52:25 +02:00
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2012-09-21 07:11:25 +02:00
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template <typename ValueType>
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Any(const ValueType& value):
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_pHolder(new Holder<ValueType>(value))
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2012-04-29 20:52:25 +02:00
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/// Creates an any which stores the init parameter inside.
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///
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/// Example:
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2012-09-21 07:11:25 +02:00
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/// Any a(13);
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/// Any a(string("12345"));
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{
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}
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2012-04-29 20:52:25 +02:00
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2012-09-21 07:11:25 +02:00
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Any(const Any& other):
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_pHolder(other._pHolder ? other._pHolder->clone() : 0)
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/// Copy constructor, works with both empty and initialized Any values.
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2012-09-21 07:11:25 +02:00
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{
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}
|
2012-04-29 20:52:25 +02:00
|
|
|
|
2012-09-21 07:11:25 +02:00
|
|
|
~Any()
|
|
|
|
{
|
2013-02-01 04:12:13 +01:00
|
|
|
delete _pHolder;
|
2012-09-21 07:11:25 +02:00
|
|
|
}
|
2012-04-29 20:52:25 +02:00
|
|
|
|
2012-09-21 07:11:25 +02:00
|
|
|
Any& swap(Any& rhs)
|
2012-04-29 20:52:25 +02:00
|
|
|
/// Swaps the content of the two Anys.
|
2012-09-21 07:11:25 +02:00
|
|
|
{
|
2013-02-01 04:12:13 +01:00
|
|
|
std::swap(_pHolder, rhs._pHolder);
|
2012-09-21 07:11:25 +02:00
|
|
|
return *this;
|
|
|
|
}
|
2012-04-29 20:52:25 +02:00
|
|
|
|
2012-09-21 07:11:25 +02:00
|
|
|
template <typename ValueType>
|
|
|
|
Any& operator = (const ValueType& rhs)
|
2012-04-29 20:52:25 +02:00
|
|
|
/// Assignment operator for all types != Any.
|
|
|
|
///
|
|
|
|
/// Example:
|
2013-02-01 04:12:13 +01:00
|
|
|
/// Any a = 13;
|
|
|
|
/// Any a = string("12345");
|
2012-09-21 07:11:25 +02:00
|
|
|
{
|
|
|
|
Any(rhs).swap(*this);
|
|
|
|
return *this;
|
|
|
|
}
|
|
|
|
|
|
|
|
Any& operator = (const Any& rhs)
|
2012-04-29 20:52:25 +02:00
|
|
|
/// Assignment operator for Any.
|
2012-09-21 07:11:25 +02:00
|
|
|
{
|
|
|
|
Any(rhs).swap(*this);
|
|
|
|
return *this;
|
|
|
|
}
|
2012-04-29 20:52:25 +02:00
|
|
|
|
2012-09-21 07:11:25 +02:00
|
|
|
bool empty() const
|
2013-02-01 04:12:13 +01:00
|
|
|
/// Returns true if the Any is empty.
|
2012-09-21 07:11:25 +02:00
|
|
|
{
|
2013-02-01 04:12:13 +01:00
|
|
|
return !_pHolder;
|
2012-09-21 07:11:25 +02:00
|
|
|
}
|
2012-04-29 20:52:25 +02:00
|
|
|
|
2012-09-21 07:11:25 +02:00
|
|
|
const std::type_info& type() const
|
2012-04-29 20:52:25 +02:00
|
|
|
/// Returns the type information of the stored content.
|
|
|
|
/// If the Any is empty typeid(void) is returned.
|
2013-02-01 04:12:13 +01:00
|
|
|
/// It is recommended to always query an Any for its type info before
|
|
|
|
/// trying to extract data via an AnyCast/RefAnyCast.
|
2012-09-21 07:11:25 +02:00
|
|
|
{
|
2013-02-01 04:12:13 +01:00
|
|
|
return _pHolder ? _pHolder->type() : typeid(void);
|
2012-09-21 07:11:25 +02:00
|
|
|
}
|
2012-04-29 20:52:25 +02:00
|
|
|
|
|
|
|
private:
|
2013-02-06 05:12:21 +01:00
|
|
|
class ValueHolder
|
2012-09-21 07:11:25 +02:00
|
|
|
{
|
|
|
|
public:
|
2013-02-06 05:12:21 +01:00
|
|
|
virtual ~ValueHolder()
|
2012-09-21 07:11:25 +02:00
|
|
|
{
|
|
|
|
}
|
|
|
|
|
|
|
|
virtual const std::type_info& type() const = 0;
|
2013-02-06 05:12:21 +01:00
|
|
|
virtual ValueHolder* clone() const = 0;
|
2012-09-21 07:11:25 +02:00
|
|
|
};
|
|
|
|
|
|
|
|
template <typename ValueType>
|
2013-02-06 05:12:21 +01:00
|
|
|
class Holder: public ValueHolder
|
2012-09-21 07:11:25 +02:00
|
|
|
{
|
|
|
|
public:
|
|
|
|
Holder(const ValueType& value):
|
2012-04-29 20:52:25 +02:00
|
|
|
_held(value)
|
2012-09-21 07:11:25 +02:00
|
|
|
{
|
|
|
|
}
|
2012-04-29 20:52:25 +02:00
|
|
|
|
2012-09-21 07:11:25 +02:00
|
|
|
virtual const std::type_info& type() const
|
|
|
|
{
|
|
|
|
return typeid(ValueType);
|
|
|
|
}
|
2012-04-29 20:52:25 +02:00
|
|
|
|
2013-02-06 05:12:21 +01:00
|
|
|
virtual ValueHolder* clone() const
|
2012-09-21 07:11:25 +02:00
|
|
|
{
|
|
|
|
return new Holder(_held);
|
|
|
|
}
|
2012-04-29 20:52:25 +02:00
|
|
|
|
2012-09-21 07:11:25 +02:00
|
|
|
ValueType _held;
|
2013-02-01 04:12:13 +01:00
|
|
|
|
|
|
|
private:
|
|
|
|
Holder & operator=(const Holder &);
|
2012-09-21 07:11:25 +02:00
|
|
|
};
|
2012-04-29 20:52:25 +02:00
|
|
|
|
2013-02-06 05:12:21 +01:00
|
|
|
ValueHolder* content() const
|
2013-02-01 04:12:13 +01:00
|
|
|
{
|
|
|
|
return _pHolder;
|
|
|
|
}
|
|
|
|
|
2012-04-29 20:52:25 +02:00
|
|
|
private:
|
2013-02-06 05:12:21 +01:00
|
|
|
ValueHolder* _pHolder;
|
2013-02-01 04:12:13 +01:00
|
|
|
|
|
|
|
#endif // POCO_NO_SOO
|
|
|
|
|
2012-09-21 07:11:25 +02:00
|
|
|
template <typename ValueType>
|
|
|
|
friend ValueType* AnyCast(Any*);
|
2012-04-29 20:52:25 +02:00
|
|
|
|
2012-09-21 07:11:25 +02:00
|
|
|
template <typename ValueType>
|
|
|
|
friend ValueType* UnsafeAnyCast(Any*);
|
2012-04-29 20:52:25 +02:00
|
|
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
|
|
template <typename ValueType>
|
|
|
|
ValueType* AnyCast(Any* operand)
|
|
|
|
/// AnyCast operator used to extract the ValueType from an Any*. Will return a pointer
|
|
|
|
/// to the stored value.
|
|
|
|
///
|
|
|
|
/// Example Usage:
|
2012-09-21 07:11:25 +02:00
|
|
|
/// MyType* pTmp = AnyCast<MyType*>(pAny).
|
2012-04-29 20:52:25 +02:00
|
|
|
/// Will return NULL if the cast fails, i.e. types don't match.
|
|
|
|
{
|
2012-09-21 07:11:25 +02:00
|
|
|
return operand && operand->type() == typeid(ValueType)
|
2013-02-01 04:12:13 +01:00
|
|
|
? &static_cast<Any::Holder<ValueType>*>(operand->content())->_held
|
2012-09-21 07:11:25 +02:00
|
|
|
: 0;
|
2012-04-29 20:52:25 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
template <typename ValueType>
|
|
|
|
const ValueType* AnyCast(const Any* operand)
|
|
|
|
/// AnyCast operator used to extract a const ValueType pointer from an const Any*. Will return a const pointer
|
|
|
|
/// to the stored value.
|
|
|
|
///
|
|
|
|
/// Example Usage:
|
2012-09-21 07:11:25 +02:00
|
|
|
/// const MyType* pTmp = AnyCast<MyType*>(pAny).
|
2012-04-29 20:52:25 +02:00
|
|
|
/// Will return NULL if the cast fails, i.e. types don't match.
|
|
|
|
{
|
2012-09-21 07:11:25 +02:00
|
|
|
return AnyCast<ValueType>(const_cast<Any*>(operand));
|
2012-04-29 20:52:25 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
template <typename ValueType>
|
|
|
|
ValueType AnyCast(const Any& operand)
|
|
|
|
/// AnyCast operator used to extract a copy of the ValueType from an const Any&.
|
|
|
|
///
|
|
|
|
/// Example Usage:
|
2012-09-21 07:11:25 +02:00
|
|
|
/// MyType tmp = AnyCast<MyType>(anAny).
|
2012-04-29 20:52:25 +02:00
|
|
|
/// Will throw a BadCastException if the cast fails.
|
|
|
|
/// Dont use an AnyCast in combination with references, i.e. MyType& tmp = ... or const MyType& = ...
|
|
|
|
/// Some compilers will accept this code although a copy is returned. Use the RefAnyCast in
|
|
|
|
/// these cases.
|
|
|
|
{
|
2013-02-03 14:16:06 +01:00
|
|
|
typedef typename TypeWrapper<ValueType>::TYPE NonRef;
|
2013-02-03 03:37:39 +01:00
|
|
|
|
|
|
|
return AnyCast<NonRef&>(const_cast<Any&>(operand));
|
2012-04-29 20:52:25 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
template <typename ValueType>
|
|
|
|
ValueType AnyCast(Any& operand)
|
|
|
|
/// AnyCast operator used to extract a copy of the ValueType from an Any&.
|
|
|
|
///
|
|
|
|
/// Example Usage:
|
2012-09-21 07:11:25 +02:00
|
|
|
/// MyType tmp = AnyCast<MyType>(anAny).
|
2012-04-29 20:52:25 +02:00
|
|
|
/// Will throw a BadCastException if the cast fails.
|
|
|
|
/// Dont use an AnyCast in combination with references, i.e. MyType& tmp = ... or const MyType& tmp = ...
|
|
|
|
/// Some compilers will accept this code although a copy is returned. Use the RefAnyCast in
|
|
|
|
/// these cases.
|
|
|
|
{
|
2013-02-03 14:16:06 +01:00
|
|
|
typedef typename TypeWrapper<ValueType>::TYPE NonRef;
|
2013-02-03 03:37:39 +01:00
|
|
|
|
|
|
|
NonRef* result = AnyCast<NonRef>(&operand);
|
2012-09-21 07:11:25 +02:00
|
|
|
if (!result) throw BadCastException("Failed to convert between Any types");
|
|
|
|
return *result;
|
2012-04-29 20:52:25 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
template <typename ValueType>
|
|
|
|
const ValueType& RefAnyCast(const Any & operand)
|
|
|
|
/// AnyCast operator used to return a const reference to the internal data.
|
|
|
|
///
|
|
|
|
/// Example Usage:
|
2012-09-21 07:11:25 +02:00
|
|
|
/// const MyType& tmp = RefAnyCast<MyType>(anAny);
|
2012-04-29 20:52:25 +02:00
|
|
|
{
|
2012-09-21 07:11:25 +02:00
|
|
|
ValueType* result = AnyCast<ValueType>(const_cast<Any*>(&operand));
|
|
|
|
if (!result) throw BadCastException("RefAnyCast: Failed to convert between const Any types");
|
|
|
|
return *result;
|
2012-04-29 20:52:25 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
template <typename ValueType>
|
|
|
|
ValueType& RefAnyCast(Any& operand)
|
|
|
|
/// AnyCast operator used to return a reference to the internal data.
|
|
|
|
///
|
|
|
|
/// Example Usage:
|
2012-09-21 07:11:25 +02:00
|
|
|
/// MyType& tmp = RefAnyCast<MyType>(anAny);
|
2012-04-29 20:52:25 +02:00
|
|
|
{
|
2012-09-21 07:11:25 +02:00
|
|
|
ValueType* result = AnyCast<ValueType>(&operand);
|
|
|
|
if (!result) throw BadCastException("RefAnyCast: Failed to convert between Any types");
|
|
|
|
return *result;
|
2012-04-29 20:52:25 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
template <typename ValueType>
|
|
|
|
ValueType* UnsafeAnyCast(Any* operand)
|
|
|
|
/// The "unsafe" versions of AnyCast are not part of the
|
|
|
|
/// public interface and may be removed at any time. They are
|
|
|
|
/// required where we know what type is stored in the any and can't
|
|
|
|
/// use typeid() comparison, e.g., when our types may travel across
|
|
|
|
/// different shared libraries.
|
|
|
|
{
|
2013-02-03 14:16:06 +01:00
|
|
|
return &static_cast<Any::Holder<ValueType>*>(operand->content())->_held;
|
2012-04-29 20:52:25 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
template <typename ValueType>
|
|
|
|
const ValueType* UnsafeAnyCast(const Any* operand)
|
|
|
|
/// The "unsafe" versions of AnyCast are not part of the
|
|
|
|
/// public interface and may be removed at any time. They are
|
|
|
|
/// required where we know what type is stored in the any and can't
|
|
|
|
/// use typeid() comparison, e.g., when our types may travel across
|
|
|
|
/// different shared libraries.
|
|
|
|
{
|
2012-09-21 07:11:25 +02:00
|
|
|
return AnyCast<ValueType>(const_cast<Any*>(operand));
|
2012-04-29 20:52:25 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
} // namespace Poco
|
|
|
|
|
|
|
|
|
|
|
|
#endif
|