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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* Copyright (c) 2003 |
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* Francois 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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/* NOTE: This is an internal header file, included by other STL headers. |
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* You should not attempt to use it directly. |
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*/ |
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#ifndef _STLP_POINTERS_SPEC_TOOLS_H |
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#define _STLP_POINTERS_SPEC_TOOLS_H |
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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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_STLP_BEGIN_NAMESPACE |
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//Some usefull declarations: |
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template <class _Tp> struct less; |
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_STLP_MOVE_TO_PRIV_NAMESPACE |
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template <class _StorageT, class _ValueT, class _BinaryPredicate> |
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struct _BinaryPredWrapper; |
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/* |
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* Since the compiler only allows at most one non-trivial |
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* implicit conversion we can make use of a shim class to |
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* be sure that functions below doesn't accept classes with |
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* implicit pointer conversion operators |
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*/ |
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struct _ConstVolatileVoidPointerShim |
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{ _ConstVolatileVoidPointerShim(const volatile void*); }; |
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//The dispatch functions: |
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struct _VoidPointerShim |
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{ _VoidPointerShim(void*); }; |
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struct _ConstVoidPointerShim |
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{ _ConstVoidPointerShim(const void*); }; |
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struct _VolatileVoidPointerShim |
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{ _VolatileVoidPointerShim(volatile void*); }; |
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template <class _Tp> |
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char _UseVoidPtrStorageType(const __false_type& /*POD*/, const _Tp&); |
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char _UseVoidPtrStorageType(const __true_type& /*POD*/, ...); |
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char* _UseVoidPtrStorageType(const __true_type& /*POD*/, _VoidPointerShim); |
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template <class _Tp> |
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char _UseConstVoidPtrStorageType(const __false_type& /*POD*/, const _Tp&); |
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char _UseConstVoidPtrStorageType(const __true_type& /*POD*/, ...); |
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char* _UseConstVoidPtrStorageType(const __true_type& /*POD*/, _ConstVoidPointerShim); |
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template <class _Tp> |
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char _UseVolatileVoidPtrStorageType(const __false_type& /*POD*/, const _Tp&); |
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char _UseVolatileVoidPtrStorageType(const __true_type& /*POD*/, ...); |
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char* _UseVolatileVoidPtrStorageType(const __true_type& /*POD*/, _VolatileVoidPointerShim); |
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template <class _Tp> |
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char _UseConstVolatileVoidPtrStorageType(const __false_type& /*POD*/, const _Tp&); |
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char _UseConstVolatileVoidPtrStorageType(const __true_type& /*POD*/, ...); |
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char* _UseConstVolatileVoidPtrStorageType(const __true_type& /*POD*/, _ConstVolatileVoidPointerShim); |
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template <class _Tp> |
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struct _StorageType { |
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typedef typename __type_traits<_Tp>::is_POD_type _PODType; |
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static _Tp __null_rep(); |
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enum { use_void_ptr = (sizeof(_UseVoidPtrStorageType(_PODType(), __null_rep())) == sizeof(char*)) }; |
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enum { use_const_void_ptr = (sizeof(_UseConstVoidPtrStorageType(_PODType(), __null_rep())) == sizeof(char*)) }; |
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enum { use_volatile_void_ptr = (sizeof(_UseVolatileVoidPtrStorageType(_PODType(), __null_rep())) == sizeof(char*)) }; |
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enum { use_const_volatile_void_ptr = (sizeof(_UseConstVolatileVoidPtrStorageType(_PODType(), __null_rep())) == sizeof(char*)) }; |
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typedef typename __select<!use_const_volatile_void_ptr, |
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_Tp, |
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typename __select<use_void_ptr, |
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void*, |
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typename __select<use_const_void_ptr, |
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const void*, |
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typename __select<use_volatile_void_ptr, |
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volatile void*, |
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const volatile void*>::_Ret >::_Ret >::_Ret >::_Ret _QualifiedType; |
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#if !defined (_STLP_CLASS_PARTIAL_SPECIALIZATION) |
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/* If the compiler do not support the iterator_traits structure we cannot wrap |
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* iterators pass to container template methods. The iterator dereferenced value |
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* has to be storable without any cast in the chosen storage type. To guaranty |
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* that the void pointer has to be correctly qualified. |
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*/ |
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typedef _QualifiedType _Type; |
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#else |
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/* With iterator_traits we can wrap passed iterators and make the necessary casts. |
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* We can always use a simple void* storage type: |
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*/ |
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typedef typename __select<use_const_volatile_void_ptr, |
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void*, |
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_Tp>::_Ret _Type; |
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#endif |
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}; |
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110 |
|
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template <class _Tp, class _Compare> |
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struct _AssocStorageTypes { |
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typedef _StorageType<_Tp> _StorageTypeInfo; |
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typedef typename _StorageTypeInfo::_Type _SType; |
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115 |
|
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//We need to also check that the comparison functor used to instanciate the assoc container |
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//is the default Standard less implementation: |
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typedef typename _IsSTLportClass<_Compare>::_Ret _STLportLess; |
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enum { is_default_less = __type2bool<_STLportLess>::_Ret }; |
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120 |
|
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typedef typename __select<is_default_less, _SType, _Tp>::_Ret _KeyStorageType; |
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enum { ptr_type = _StorageTypeInfo::use_const_volatile_void_ptr }; |
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typedef typename __select<is_default_less && ptr_type, |
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_BinaryPredWrapper<_KeyStorageType, _Tp, _Compare>, |
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_Compare>::_Ret _CompareStorageType; |
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}; |
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127 |
|
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128 |
|
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#if defined (_STLP_CLASS_PARTIAL_SPECIALIZATION) |
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/* |
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* Base struct to deal with qualifiers |
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*/ |
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template <class _StorageT, class _QualifiedStorageT> |
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struct _VoidCastTraitsAux { |
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typedef _QualifiedStorageT void_cv_type; |
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typedef _StorageT void_type; |
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137 |
|
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static void_type * uncv_ptr(void_cv_type *__ptr) |
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{ return __ptr; } |
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static void_type const* uncv_cptr(void_cv_type const*__ptr) |
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{ return __ptr; } |
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static void_type ** uncv_pptr(void_cv_type **__ptr) |
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{ return __ptr; } |
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static void_type & uncv_ref(void_cv_type & __ref) |
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{ return __ref; } |
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static void_type const& uncv_cref(void_cv_type const& __ref) |
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{ return __ref; } |
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static void_cv_type* cv_ptr(void_type *__ptr) |
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{ return __ptr; } |
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static void_cv_type const* cv_cptr(void_type const*__ptr) |
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{ return __ptr; } |
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static void_cv_type ** cv_pptr(void_type **__ptr) |
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{ return __ptr; } |
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static void_cv_type & cv_ref(void_type & __ref) |
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{ return __ref; } |
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static void_cv_type const& cv_cref(void_type const& __ref) |
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{ return __ref; } |
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}; |
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159 |
|
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template <class _VoidCVType> |
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struct _VoidCastTraitsAuxBase { |
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typedef _VoidCVType* void_cv_type; |
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typedef void* void_type; |
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164 |
|
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static void_type* uncv_ptr(void_cv_type *__ptr) |
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{ return __CONST_CAST(void_type*, __ptr); } |
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static void_type const* uncv_cptr(void_cv_type const*__ptr) |
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{ return __CONST_CAST(void_type const*, __ptr); } |
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static void_type** uncv_pptr(void_cv_type **__ptr) |
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{ return __CONST_CAST(void_type**, __ptr); } |
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static void_type& uncv_ref(void_cv_type &__ref) |
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{ return __CONST_CAST(void_type&, __ref); } |
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static void_type const& uncv_cref(void_cv_type const& __ptr) |
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{ return __CONST_CAST(void_type const&, __ptr); } |
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// The reverse versions |
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static void_cv_type * cv_ptr(void_type *__ptr) |
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{ return __CONST_CAST(void_cv_type *, __ptr); } |
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static void_cv_type const* cv_cptr(void_type const*__ptr) |
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{ return __CONST_CAST(void_cv_type const*, __ptr); } |
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static void_cv_type ** cv_pptr(void_type **__ptr) |
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{ return __CONST_CAST(void_cv_type**, __ptr); } |
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static void_cv_type & cv_ref(void_type &__ref) |
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{ return __CONST_CAST(void_cv_type &, __ref); } |
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static void_cv_type const& cv_cref(void_type const& __ref) |
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{ return __CONST_CAST(void_cv_type const&, __ref); } |
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}; |
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|
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_STLP_TEMPLATE_NULL |
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struct _VoidCastTraitsAux<void*, const void*> : _VoidCastTraitsAuxBase<void const> |
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{}; |
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_STLP_TEMPLATE_NULL |
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struct _VoidCastTraitsAux<void*, volatile void*> : _VoidCastTraitsAuxBase<void volatile> |
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{}; |
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_STLP_TEMPLATE_NULL |
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struct _VoidCastTraitsAux<void*, const volatile void*> : _VoidCastTraitsAuxBase<void const volatile> |
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{}; |
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|
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template <class _StorageT, class _ValueT> |
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struct _CastTraits { |
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typedef _ValueT value_type; |
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typedef typename _StorageType<_ValueT>::_QualifiedType _QualifiedStorageT; |
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typedef _VoidCastTraitsAux<_StorageT, _QualifiedStorageT> cv_traits; |
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typedef typename cv_traits::void_type void_type; |
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typedef typename cv_traits::void_cv_type void_cv_type; |
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static value_type * to_value_type_ptr(void_type *__ptr) |
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{ return __REINTERPRET_CAST(value_type *, cv_traits::cv_ptr(__ptr)); } |
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static value_type const* to_value_type_cptr(void_type const*__ptr) |
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{ return __REINTERPRET_CAST(value_type const*, cv_traits::cv_cptr(__ptr)); } |
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static value_type ** to_value_type_pptr(void_type **__ptr) |
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{ return __REINTERPRET_CAST(value_type **, cv_traits::cv_pptr(__ptr)); } |
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static value_type & to_value_type_ref(void_type &__ref) |
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{ return __REINTERPRET_CAST(value_type &, cv_traits::cv_ref(__ref)); } |
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static value_type const& to_value_type_cref(void_type const& __ptr) |
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{ return __REINTERPRET_CAST(value_type const&, cv_traits::cv_cref(__ptr)); } |
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// Reverse versions |
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static void_type * to_storage_type_ptr(value_type *__ptr) |
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{ return cv_traits::uncv_ptr(__REINTERPRET_CAST(void_cv_type *, __ptr)); } |
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static void_type const* to_storage_type_cptr(value_type const*__ptr) |
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{ return cv_traits::uncv_cptr(__REINTERPRET_CAST(void_cv_type const*, __ptr)); } |
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static void_type ** to_storage_type_pptr(value_type **__ptr) |
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{ return cv_traits::uncv_pptr(__REINTERPRET_CAST(void_cv_type **, __ptr)); } |
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static void_type const& to_storage_type_cref(value_type const& __ref) |
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{ return cv_traits::uncv_cref(__REINTERPRET_CAST(void_cv_type const&, __ref)); } |
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//Method used to treat set container template method extension |
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static void_type const& to_storage_type_crefT(value_type const& __ref) |
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{ return to_storage_type_cref(__ref); } |
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}; |
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template <class _Tp> |
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struct _CastTraits<_Tp, _Tp> { |
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typedef _Tp storage_type; |
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typedef _Tp value_type; |
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|
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static value_type * to_value_type_ptr(storage_type *__ptr) |
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{ return __ptr; } |
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static value_type const* to_value_type_cptr(storage_type const*__ptr) |
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{ return __ptr; } |
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static value_type ** to_value_type_pptr(storage_type **__ptr) |
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{ return __ptr; } |
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static value_type & to_value_type_ref(storage_type &__ref) |
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{ return __ref; } |
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static value_type const& to_value_type_cref(storage_type const&__ref) |
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{ return __ref; } |
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// Reverse versions |
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static storage_type * to_storage_type_ptr(value_type *__ptr) |
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{ return __ptr; } |
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static storage_type const* to_storage_type_cptr(value_type const*__ptr) |
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{ return __ptr; } |
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static storage_type ** to_storage_type_pptr(value_type **__ptr) |
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{ return __ptr; } |
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static storage_type const& to_storage_type_cref(value_type const& __ref) |
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{ return __ref; } |
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|
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//Method used to treat set container template method extension |
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template <class _Tp1> |
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static _Tp1 const& to_storage_type_crefT(_Tp1 const& __ref) |
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{ return __ref; } |
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}; |
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|
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#define _STLP_USE_ITERATOR_WRAPPER |
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template <class _StorageT, class _ValueT, class _Iterator> |
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struct _IteWrapper { |
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typedef _CastTraits<_StorageT, _ValueT> cast_traits; |
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typedef iterator_traits<_Iterator> _IteTraits; |
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|
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typedef typename _IteTraits::iterator_category iterator_category; |
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typedef _StorageT value_type; |
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typedef typename _IteTraits::difference_type difference_type; |
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typedef value_type* pointer; |
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typedef value_type const& const_reference; |
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//This wrapper won't be used for input so to avoid surprise |
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//the reference type will be a const reference: |
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typedef const_reference reference; |
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|
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typedef _IteWrapper<_StorageT, _ValueT, _Iterator> _Self; |
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typedef _Self _Ite; |
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|
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_IteWrapper(_Iterator &__ite) : _M_ite(__ite) {} |
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const_reference operator*() const { return cast_traits::to_storage_type_cref(*_M_ite); } |
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_Self& operator= (_Self const& __rhs) { |
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_M_ite = __rhs._M_ite; |
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return *this; |
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} |
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|
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_Self& operator++() { |
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++_M_ite; |
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return *this; |
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} |
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_Self& operator--() { |
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--_M_ite; |
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return *this; |
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} |
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_Self& operator += (difference_type __offset) { |
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_M_ite += __offset; |
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return *this; |
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} |
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difference_type operator -(_Self const& __other) const |
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{ return _M_ite - __other._M_ite; } |
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|
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bool operator == (_Self const& __other) const |
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{ return _M_ite == __other._M_ite; } |
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|
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bool operator != (_Self const& __other) const |
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{ return _M_ite != __other._M_ite; } |
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bool operator < (_Self const& __rhs) const |
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{ return _M_ite < __rhs._M_ite; } |
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private: |
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_Iterator _M_ite; |
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}; |
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template <class _Tp, class _Iterator> |
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struct _IteWrapper<_Tp, _Tp, _Iterator> |
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{ typedef _Iterator _Ite; }; |
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#else |
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/* |
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* In this config the storage type is qualified in respect of the |
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* value_type qualification. Simple reinterpret_cast is enough. |
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*/ |
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template <class _StorageT, class _ValueT> |
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struct _CastTraits { |
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typedef _StorageT storage_type; |
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typedef _ValueT value_type; |
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|
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static value_type * to_value_type_ptr(storage_type *__ptr) |
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{ return __REINTERPRET_CAST(value_type*, __ptr); } |
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static value_type const* to_value_type_cptr(storage_type const*__ptr) |
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{ return __REINTERPRET_CAST(value_type const*, __ptr); } |
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static value_type ** to_value_type_pptr(storage_type **__ptr) |
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{ return __REINTERPRET_CAST(value_type **, __ptr); } |
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static value_type & to_value_type_ref(storage_type &__ref) |
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{ return __REINTERPRET_CAST(value_type&, __ref); } |
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static value_type const& to_value_type_cref(storage_type const&__ref) |
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{ return __REINTERPRET_CAST(value_type const&, __ref); } |
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// Reverse versions |
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static storage_type * to_storage_type_ptr(value_type *__ptr) |
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{ return __REINTERPRET_CAST(storage_type*, __ptr); } |
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static storage_type const* to_storage_type_cptr(value_type const*__ptr) |
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{ return __REINTERPRET_CAST(storage_type const*, __ptr); } |
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static storage_type ** to_storage_type_pptr(value_type **__ptr) |
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{ return __REINTERPRET_CAST(storage_type **, __ptr); } |
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static storage_type const& to_storage_type_cref(value_type const&__ref) |
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{ return __REINTERPRET_CAST(storage_type const&, __ref); } |
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template <class _Tp1> |
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static _Tp1 const& to_storage_type_crefT(_Tp1 const& __ref) |
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{ return __ref; } |
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}; |
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|
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#endif |
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|
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//Wrapper functors: |
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template <class _StorageT, class _ValueT, class _UnaryPredicate> |
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struct _UnaryPredWrapper { |
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typedef _CastTraits<_StorageT, _ValueT> cast_traits; |
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|
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_UnaryPredWrapper (_UnaryPredicate const& __pred) : _M_pred(__pred) {} |
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|
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bool operator () (_StorageT const& __ref) const |
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{ return _M_pred(cast_traits::to_value_type_cref(__ref)); } |
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|
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private: |
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_UnaryPredicate _M_pred; |
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}; |
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|
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template <class _StorageT, class _ValueT, class _BinaryPredicate> |
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struct _BinaryPredWrapper { |
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typedef _CastTraits<_StorageT, _ValueT> cast_traits; |
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|
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_BinaryPredWrapper () {} |
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_BinaryPredWrapper (_BinaryPredicate const& __pred) : _M_pred(__pred) {} |
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|
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_BinaryPredicate get_pred() const { return _M_pred; } |
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|
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bool operator () (_StorageT const& __fst, _StorageT const& __snd) const |
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{ return _M_pred(cast_traits::to_value_type_cref(__fst), cast_traits::to_value_type_cref(__snd)); } |
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|
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//Cast operator used to transparently access underlying predicate |
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//in set::key_comp() method |
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operator _BinaryPredicate() const |
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{ return _M_pred; } |
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|
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private: |
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_BinaryPredicate _M_pred; |
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}; |
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|
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_STLP_MOVE_TO_STD_NAMESPACE |
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_STLP_END_NAMESPACE |
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|
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#endif /* _STLP_POINTERS_SPEC_TOOLS_H */ |