author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Fri, 11 Jun 2010 15:26:22 +0300 | |
changeset 34 | 5fae379060a7 |
parent 0 | e4d67989cc36 |
permissions | -rw-r--r-- |
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/* |
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* |
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* Copyright (c) 2003 |
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* François Dumont |
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* |
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* This material is provided "as is", with absolutely no warranty expressed |
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* or implied. Any use is at your own risk. |
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* |
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* Permission to use or copy this software for any purpose is hereby granted |
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* without fee, provided the above notices are retained on all copies. |
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* Permission to modify the code and to distribute modified code is granted, |
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* provided the above notices are retained, and a notice that the code was |
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* modified is included with the above copyright notice. |
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* |
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*/ |
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|
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#ifndef _STLP_MOVE_CONSTRUCT_FWK_H |
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#define _STLP_MOVE_CONSTRUCT_FWK_H |
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|
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#ifndef _STLP_TYPE_TRAITS_H |
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# include <stl/type_traits.h> |
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#endif |
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|
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_STLP_BEGIN_NAMESPACE |
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|
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/************************************************************* |
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* Move constructor framework |
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*************************************************************/ |
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|
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/************************************************************* |
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*Partial move: |
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*The source HAS to be a valid instance after the move! |
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*************************************************************/ |
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template <class _Tp> |
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class __move_source { |
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public: |
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explicit __move_source (_Tp &_src) : _M_data(_src) |
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{} |
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|
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_Tp& get() const |
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{ return _M_data; } |
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private: |
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_Tp &_M_data; |
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|
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//We explicitely forbid assignment to avoid warning: |
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typedef __move_source<_Tp> _Self; |
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_Self& operator = (_Self const&); |
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}; |
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|
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//Class used to signal move constructor support, implementation and type. |
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template <class _Tp> |
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struct __move_traits { |
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/* |
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* implemented tells if a the special move constructor has to be called or the classic |
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* copy constructor is just fine. Most of the time the copy constructor is fine only |
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* if the following info is true. |
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*/ |
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#if defined (_STLP_USE_PARTIAL_SPEC_WORKAROUND) && \ |
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!defined (_STLP_CLASS_PARTIAL_SPECIALIZATION) && \ |
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!defined (_STLP_NO_MOVE_SEMANTIC) |
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typedef typename _IsSTLportClass<_Tp>::_Ret implemented; |
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#else |
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typedef __false_type implemented; |
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#endif |
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/* |
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* complete tells if the move is complete or partial, that is to say, does the source |
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* needs to be destroyed once it has been moved. |
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*/ |
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typedef typename __type_traits<_Tp>::has_trivial_destructor complete; |
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}; |
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#if !defined (_STLP_NO_MOVE_SEMANTIC) |
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typedef __true_type __stlp_movable; |
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#else |
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typedef __false_type __stlp_movable; |
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#endif |
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_STLP_MOVE_TO_PRIV_NAMESPACE |
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/* |
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* This struct should never be used if the user has not explicitely stipulated |
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* that its class support the full move concept. To check that the return type |
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* in such a case will be __invalid_source<_Tp> to generate a compile error |
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* revealing the configuration problem. |
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*/ |
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template <class _Tp> |
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struct _MoveSourceTraits { |
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typedef typename __move_traits<_Tp>::implemented _MvImpRet; |
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#if defined (__BORLANDC__) |
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typedef typename __selectT<_MvImpRet, |
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#else |
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enum {_MvImp = __type2bool<_MvImpRet>::_Ret}; |
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typedef typename __select<_MvImp, |
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#endif |
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__move_source<_Tp>, |
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_Tp const&>::_Ret _Type; |
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}; |
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|
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//The helper function |
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template <class _Tp> |
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inline _STLP_TYPENAME_ON_RETURN_TYPE _MoveSourceTraits<_Tp>::_Type |
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_AsMoveSource (_Tp &src) { |
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typedef typename _MoveSourceTraits<_Tp>::_Type _SrcType; |
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return _SrcType(src); |
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} |
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//Helper structs used for many class. |
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template <class _Tp> |
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struct __move_traits_aux { |
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typedef typename __move_traits<_Tp>::implemented implemented; |
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typedef typename __move_traits<_Tp>::complete complete; |
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}; |
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template <class _Tp1, class _Tp2> |
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struct __move_traits_aux2 { |
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typedef __move_traits<_Tp1> _MoveTraits1; |
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typedef __move_traits<_Tp2> _MoveTraits2; |
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typedef typename _Lor2<typename _MoveTraits1::implemented, |
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typename _MoveTraits2::implemented>::_Ret implemented; |
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typedef typename _Land2<typename _MoveTraits1::complete, |
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typename _MoveTraits2::complete>::_Ret complete; |
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}; |
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/* |
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* Most of the time a class implement a move constructor but its use depends |
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* on a third party, this is what the following struct are for. |
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*/ |
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template <class _Tp> |
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struct __move_traits_help { |
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typedef __true_type implemented; |
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typedef typename __move_traits<_Tp>::complete complete; |
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}; |
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|
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template <class _Tp1, class _Tp2> |
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struct __move_traits_help1 { |
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typedef __move_traits<_Tp1> _MoveTraits1; |
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typedef __move_traits<_Tp2> _MoveTraits2; |
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typedef typename _Lor2<typename _MoveTraits1::implemented, |
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typename _MoveTraits2::implemented>::_Ret implemented; |
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typedef typename _Land2<typename _MoveTraits1::complete, |
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typename _MoveTraits2::complete>::_Ret complete; |
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}; |
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template <class _Tp1, class _Tp2> |
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struct __move_traits_help2 { |
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typedef __move_traits<_Tp1> _MoveTraits1; |
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typedef __move_traits<_Tp2> _MoveTraits2; |
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typedef __stlp_movable implemented; |
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typedef typename _Land2<typename _MoveTraits1::complete, |
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typename _MoveTraits2::complete>::_Ret complete; |
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}; |
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_STLP_MOVE_TO_STD_NAMESPACE |
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_STLP_END_NAMESPACE |
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#endif /* _STLP_MOVE_CONSTRUCT_FWK_H */ |