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472 lines
18 KiB
C++
472 lines
18 KiB
C++
/*
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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 _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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struct _ConstVolatileVoidPointerShim
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{ _ConstVolatileVoidPointerShim(const volatile void*); };
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//The dispatch functions:
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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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#if defined (_STLP_CLASS_PARTIAL_SPECIALIZATION)
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/* Thanks to class partial specialization the pointer specialization feature can even be used in
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* presence of incomplete type:
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* struct MyStruct {
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* typedef vector<MyStruct> MyStructContainer;
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* typedef MyStructContainer::iterator MyStructIterator;
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* };
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*/
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template <class _Tp>
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struct _StorageType {
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typedef _Tp _QualifiedType;
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typedef _Tp _Type;
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enum { use_const_volatile_void_ptr = 0 };
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};
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template <class _Tp>
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struct _StorageType<_Tp*> {
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// Even if we detect a pointer type we use dispatch function to consider if it can be stored as a void*.
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// For instance function pointer might not necessarily be convertible to void*.
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enum { use_void_ptr = (sizeof(_UseVoidPtrStorageType(__true_type(),
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__STATIC_CAST(_Tp*, 0))) == sizeof(char*)) };
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enum { use_const_volatile_void_ptr = use_void_ptr };
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typedef typename __select<use_void_ptr,
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void*,
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_Tp*>::_Ret _QualifiedType;
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typedef _QualifiedType _Type;
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};
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template <class _Tp>
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struct _StorageType<_Tp const*> {
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enum { use_void_ptr = (sizeof(_UseConstVoidPtrStorageType(__true_type(),
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__STATIC_CAST(const _Tp*, 0))) == sizeof(char*)) };
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enum { use_const_volatile_void_ptr = use_void_ptr };
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typedef typename __select<use_void_ptr,
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const void*,
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const _Tp*>::_Ret _QualifiedType;
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typedef typename __select<use_void_ptr,
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void*,
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const _Tp*>::_Ret _Type;
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};
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template <class _Tp>
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struct _StorageType<_Tp volatile*> {
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enum { use_void_ptr = (sizeof(_UseVolatileVoidPtrStorageType(__true_type(),
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__STATIC_CAST(_Tp volatile*, 0))) == sizeof(char*)) };
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enum { use_const_volatile_void_ptr = use_void_ptr };
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typedef typename __select<use_void_ptr,
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volatile void*,
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volatile _Tp*>::_Ret _QualifiedType;
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typedef typename __select<use_void_ptr,
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void*,
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volatile _Tp*>::_Ret _Type;
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};
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template <class _Tp>
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struct _StorageType<_Tp const volatile*> {
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enum { use_void_ptr = (sizeof(_UseConstVolatileVoidPtrStorageType(__true_type(),
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__STATIC_CAST(_Tp const volatile*, 0))) == sizeof(char*)) };
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enum { use_const_volatile_void_ptr = use_void_ptr };
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typedef typename __select<use_void_ptr,
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const volatile void*,
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const volatile _Tp*>::_Ret _QualifiedType;
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typedef typename __select<use_void_ptr,
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void*,
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const volatile _Tp*>::_Ret _Type;
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};
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#else
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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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#if !defined (__BORLANDC__) || (__BORLANDC__ != 0x560)
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static _Tp __null_rep();
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#else
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static _Tp __null_rep;
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#endif
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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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#endif
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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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//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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enum { ptr_type = _StorageTypeInfo::use_const_volatile_void_ptr };
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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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typedef typename __select<is_default_less, _SType, _Tp>::_Ret _KeyStorageType;
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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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#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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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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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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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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_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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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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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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//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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#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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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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typedef _IteWrapper<_StorageT, _ValueT, _Iterator> _Self;
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typedef _Self _Ite;
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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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_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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bool operator == (_Self const& __other) const
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{ return _M_ite == __other._M_ite; }
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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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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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#endif
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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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_UnaryPredWrapper (_UnaryPredicate const& __pred) : _M_pred(__pred) {}
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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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private:
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_UnaryPredicate _M_pred;
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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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_BinaryPredWrapper () {}
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_BinaryPredWrapper (_BinaryPredicate const& __pred) : _M_pred(__pred) {}
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_BinaryPredicate get_pred() const { return _M_pred; }
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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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//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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private:
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_BinaryPredicate _M_pred;
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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_POINTERS_SPEC_TOOLS_H */
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