test: epoc32/include/tools/stlport/stl/pointers/

     1 /*

     2  * Copyright (c) 2003

     3  * Francois Dumont

     4  *

     5  * This material is provided "as is", with absolutely no warranty expressed

     6  * or implied. Any use is at your own risk.

     7  *

     8  * Permission to use or copy this software for any purpose is hereby granted

     9  * without fee, provided the above notices are retained on all copies.

    10  * Permission to modify the code and to distribute modified code is granted,

    11  * provided the above notices are retained, and a notice that the code was

    12  * modified is included with the above copyright notice.

    13  *

    14  */

    16 /* NOTE: This is an internal header file, included by other STL headers.

    17  *   You should not attempt to use it directly.

    18  */

    20 #ifndef _STLP_POINTERS_SPEC_TOOLS_H

    21 #define _STLP_POINTERS_SPEC_TOOLS_H

    23 #ifndef _STLP_TYPE_TRAITS_H

    24 #  include <stl/type_traits.h>

    25 #endif

    27 _STLP_BEGIN_NAMESPACE

    29 //Some usefull declarations:

    30 template <class _Tp> struct less;

    32 _STLP_MOVE_TO_PRIV_NAMESPACE

    34 template <class _StorageT, class _ValueT, class _BinaryPredicate>

    35 struct _BinaryPredWrapper;

    37 /*

    38  * Since the compiler only allows at most one non-trivial

    39  * implicit conversion we can make use of a shim class to

    40  * be sure that functions below doesn't accept classes with

    41  * implicit pointer conversion operators

    42  */

    43 struct _ConstVolatileVoidPointerShim

    44 { _ConstVolatileVoidPointerShim(const volatile void*); };

    46 //The dispatch functions:

    47 struct _VoidPointerShim

    48 { _VoidPointerShim(void*); };

    49 struct _ConstVoidPointerShim

    50 { _ConstVoidPointerShim(const void*); };

    51 struct _VolatileVoidPointerShim

    52 { _VolatileVoidPointerShim(volatile void*); };

    54 template <class _Tp>

    55 char _UseVoidPtrStorageType(const __false_type& /*POD*/, const _Tp&);

    56 char _UseVoidPtrStorageType(const __true_type& /*POD*/, ...);

    57 char* _UseVoidPtrStorageType(const __true_type& /*POD*/, _VoidPointerShim);

    59 template <class _Tp>

    60 char _UseConstVoidPtrStorageType(const __false_type& /*POD*/, const _Tp&);

    61 char _UseConstVoidPtrStorageType(const __true_type& /*POD*/, ...);

    62 char* _UseConstVoidPtrStorageType(const __true_type& /*POD*/, _ConstVoidPointerShim);

    64 template <class _Tp>

    65 char _UseVolatileVoidPtrStorageType(const __false_type& /*POD*/, const _Tp&);

    66 char _UseVolatileVoidPtrStorageType(const __true_type& /*POD*/, ...);

    67 char* _UseVolatileVoidPtrStorageType(const __true_type& /*POD*/, _VolatileVoidPointerShim);

    69 template <class _Tp>

    70 char _UseConstVolatileVoidPtrStorageType(const __false_type& /*POD*/, const _Tp&);

    71 char _UseConstVolatileVoidPtrStorageType(const __true_type& /*POD*/, ...);

    72 char* _UseConstVolatileVoidPtrStorageType(const __true_type& /*POD*/, _ConstVolatileVoidPointerShim);

    74 template <class _Tp>

    75 struct _StorageType {

    76   typedef typename __type_traits<_Tp>::is_POD_type _PODType;

    77   static _Tp __null_rep();

    79   enum { use_void_ptr = (sizeof(_UseVoidPtrStorageType(_PODType(), __null_rep())) == sizeof(char*)) };

    80   enum { use_const_void_ptr = (sizeof(_UseConstVoidPtrStorageType(_PODType(), __null_rep())) == sizeof(char*)) };

    81   enum { use_volatile_void_ptr = (sizeof(_UseVolatileVoidPtrStorageType(_PODType(), __null_rep())) == sizeof(char*)) };

    82   enum { use_const_volatile_void_ptr = (sizeof(_UseConstVolatileVoidPtrStorageType(_PODType(), __null_rep())) == sizeof(char*)) };

    84   typedef typename __select<!use_const_volatile_void_ptr,

    85                             _Tp,

    86           typename __select<use_void_ptr,

    87                             void*,

    88           typename __select<use_const_void_ptr,

    89                             const void*,

    90           typename __select<use_volatile_void_ptr,

    91                             volatile void*,

    92                             const volatile void*>::_Ret >::_Ret >::_Ret >::_Ret _QualifiedType;

    94 #if !defined (_STLP_CLASS_PARTIAL_SPECIALIZATION)

    95   /* If the compiler do not support the iterator_traits structure we cannot wrap

    96    * iterators pass to container template methods. The iterator dereferenced value

    97    * has to be storable without any cast in the chosen storage type. To guaranty

    98    * that the void pointer has to be correctly qualified.

    99    */

   100   typedef _QualifiedType _Type;

   101 #else

   102   /* With iterator_traits we can wrap passed iterators and make the necessary casts.

   103    * We can always use a simple void* storage type:

   104    */

   105   typedef typename __select<use_const_volatile_void_ptr,

   106                             void*,

   107                             _Tp>::_Ret _Type;

   108 #endif

   109 };

   111 template <class _Tp, class _Compare>

   112 struct _AssocStorageTypes {

   113   typedef _StorageType<_Tp> _StorageTypeInfo;

   114   typedef typename _StorageTypeInfo::_Type _SType;

   116   //We need to also check that the comparison functor used to instanciate the assoc container

   117   //is the default Standard less implementation:

   118   typedef typename _IsSTLportClass<_Compare>::_Ret _STLportLess;

   119   enum { is_default_less = __type2bool<_STLportLess>::_Ret };

   121   typedef typename __select<is_default_less, _SType, _Tp>::_Ret _KeyStorageType;

   122   enum { ptr_type = _StorageTypeInfo::use_const_volatile_void_ptr };

   123   typedef typename __select<is_default_less && ptr_type,

   124                             _BinaryPredWrapper<_KeyStorageType, _Tp, _Compare>,

   125                             _Compare>::_Ret _CompareStorageType;

   126 };

   129 #if defined (_STLP_CLASS_PARTIAL_SPECIALIZATION)

   130 /*

   131  * Base struct to deal with qualifiers

   132  */

   133 template <class _StorageT, class _QualifiedStorageT>

   134 struct _VoidCastTraitsAux {

   135   typedef _QualifiedStorageT void_cv_type;

   136   typedef _StorageT void_type;

   138   static void_type * uncv_ptr(void_cv_type *__ptr)

   139   { return __ptr; }

   140   static void_type const* uncv_cptr(void_cv_type const*__ptr)

   141   { return __ptr; }

   142   static void_type ** uncv_pptr(void_cv_type **__ptr)

   143   { return __ptr; }

   144   static void_type & uncv_ref(void_cv_type & __ref)

   145   { return __ref; }

   146   static void_type const& uncv_cref(void_cv_type const& __ref)

   147   { return __ref; }

   148   static void_cv_type* cv_ptr(void_type *__ptr)

   149   { return __ptr; }

   150   static void_cv_type const* cv_cptr(void_type const*__ptr)

   151   { return __ptr; }

   152   static void_cv_type ** cv_pptr(void_type **__ptr)

   153   { return __ptr; }

   154   static void_cv_type & cv_ref(void_type & __ref)

   155   { return __ref; }

   156   static void_cv_type const& cv_cref(void_type const& __ref)

   157   { return __ref; }

   158 };

   160 template <class _VoidCVType>

   161 struct _VoidCastTraitsAuxBase {

   162   typedef _VoidCVType* void_cv_type;

   163   typedef void* void_type;

   165   static void_type* uncv_ptr(void_cv_type *__ptr)

   166   { return __CONST_CAST(void_type*, __ptr); }

   167   static void_type const* uncv_cptr(void_cv_type const*__ptr)

   168   { return __CONST_CAST(void_type const*, __ptr); }

   169   static void_type** uncv_pptr(void_cv_type **__ptr)

   170   { return __CONST_CAST(void_type**, __ptr); }

   171   static void_type& uncv_ref(void_cv_type &__ref)

   172   { return __CONST_CAST(void_type&, __ref); }

   173   static void_type const& uncv_cref(void_cv_type const& __ptr)

   174   { return __CONST_CAST(void_type const&, __ptr); }

   175   // The reverse versions

   176   static void_cv_type * cv_ptr(void_type *__ptr)

   177   { return __CONST_CAST(void_cv_type *, __ptr); }

   178   static void_cv_type const* cv_cptr(void_type const*__ptr)

   179   { return __CONST_CAST(void_cv_type const*, __ptr); }

   180   static void_cv_type ** cv_pptr(void_type **__ptr)

   181   { return __CONST_CAST(void_cv_type**, __ptr); }

   182   static void_cv_type & cv_ref(void_type &__ref)

   183   { return __CONST_CAST(void_cv_type &, __ref); }

   184   static void_cv_type const& cv_cref(void_type const& __ref)

   185   { return __CONST_CAST(void_cv_type const&, __ref); }

   186 };

   188 _STLP_TEMPLATE_NULL

   189 struct _VoidCastTraitsAux<void*, const void*> : _VoidCastTraitsAuxBase<void const>

   190 {};

   191 _STLP_TEMPLATE_NULL

   192 struct _VoidCastTraitsAux<void*, volatile void*> : _VoidCastTraitsAuxBase<void volatile>

   193 {};

   194 _STLP_TEMPLATE_NULL

   195 struct _VoidCastTraitsAux<void*, const volatile void*> : _VoidCastTraitsAuxBase<void const volatile>

   196 {};

   198 template <class _StorageT, class _ValueT>

   199 struct _CastTraits {

   200   typedef _ValueT value_type;

   201   typedef typename _StorageType<_ValueT>::_QualifiedType _QualifiedStorageT;

   202   typedef _VoidCastTraitsAux<_StorageT, _QualifiedStorageT> cv_traits;

   203   typedef typename cv_traits::void_type void_type;

   204   typedef typename cv_traits::void_cv_type void_cv_type;

   206   static value_type * to_value_type_ptr(void_type *__ptr)

   207   { return __REINTERPRET_CAST(value_type *, cv_traits::cv_ptr(__ptr)); }

   208   static value_type const* to_value_type_cptr(void_type const*__ptr)

   209   { return __REINTERPRET_CAST(value_type const*, cv_traits::cv_cptr(__ptr)); }

   210   static value_type ** to_value_type_pptr(void_type **__ptr)

   211   { return __REINTERPRET_CAST(value_type **, cv_traits::cv_pptr(__ptr)); }

   212   static value_type & to_value_type_ref(void_type &__ref)

   213   { return __REINTERPRET_CAST(value_type &, cv_traits::cv_ref(__ref)); }

   214   static value_type const& to_value_type_cref(void_type const& __ptr)

   215   { return __REINTERPRET_CAST(value_type const&, cv_traits::cv_cref(__ptr)); }

   216   // Reverse versions

   217   static void_type * to_storage_type_ptr(value_type *__ptr)

   218   { return cv_traits::uncv_ptr(__REINTERPRET_CAST(void_cv_type *, __ptr)); }

   219   static void_type const* to_storage_type_cptr(value_type const*__ptr)

   220   { return cv_traits::uncv_cptr(__REINTERPRET_CAST(void_cv_type const*, __ptr)); }

   221   static void_type ** to_storage_type_pptr(value_type **__ptr)

   222   { return cv_traits::uncv_pptr(__REINTERPRET_CAST(void_cv_type **, __ptr)); }

   223   static void_type const& to_storage_type_cref(value_type const& __ref)

   224   { return cv_traits::uncv_cref(__REINTERPRET_CAST(void_cv_type const&, __ref)); }

   226   //Method used to treat set container template method extension

   227   static void_type const& to_storage_type_crefT(value_type const& __ref)

   228   { return to_storage_type_cref(__ref); }

   229 };

   231 template <class _Tp>

   232 struct _CastTraits<_Tp, _Tp> {

   233   typedef _Tp storage_type;

   234   typedef _Tp value_type;

   236   static value_type * to_value_type_ptr(storage_type *__ptr)

   237   { return __ptr; }

   238   static value_type const* to_value_type_cptr(storage_type const*__ptr)

   239   { return __ptr; }

   240   static value_type ** to_value_type_pptr(storage_type **__ptr)

   241   { return __ptr; }

   242   static value_type & to_value_type_ref(storage_type &__ref)

   243   { return __ref; }

   244   static value_type const& to_value_type_cref(storage_type const&__ref)

   245   { return __ref; }

   246   // Reverse versions

   247   static storage_type * to_storage_type_ptr(value_type *__ptr)

   248   { return __ptr; }

   249   static storage_type const* to_storage_type_cptr(value_type const*__ptr)

   250   { return __ptr; }

   251   static storage_type ** to_storage_type_pptr(value_type **__ptr)

   252   { return __ptr; }

   253   static storage_type const& to_storage_type_cref(value_type const& __ref)

   254   { return __ref; }

   256   //Method used to treat set container template method extension

   257   template <class _Tp1>

   258   static _Tp1 const& to_storage_type_crefT(_Tp1 const& __ref)

   259   { return __ref; }

   260 };

   262 #define _STLP_USE_ITERATOR_WRAPPER

   264 template <class _StorageT, class _ValueT, class _Iterator>

   265 struct _IteWrapper {

   266   typedef _CastTraits<_StorageT, _ValueT> cast_traits;

   267   typedef iterator_traits<_Iterator> _IteTraits;

   269   typedef typename _IteTraits::iterator_category iterator_category;

   270   typedef _StorageT value_type;

   271   typedef typename _IteTraits::difference_type difference_type;

   272   typedef value_type* pointer;

   273   typedef value_type const& const_reference;

   274   //This wrapper won't be used for input so to avoid surprise

   275   //the reference type will be a const reference:

   276   typedef const_reference reference;

   278   typedef _IteWrapper<_StorageT, _ValueT, _Iterator> _Self;

   279   typedef _Self _Ite;

   281   _IteWrapper(_Iterator &__ite) : _M_ite(__ite) {}

   283   const_reference operator*() const { return cast_traits::to_storage_type_cref(*_M_ite); }

   285   _Self& operator= (_Self const& __rhs) {

   286     _M_ite = __rhs._M_ite;

   287     return *this;

   288   }

   290   _Self& operator++() {

   291     ++_M_ite;

   292     return *this;

   293   }

   295   _Self& operator--() {

   296     --_M_ite;

   297     return *this;

   298   }

   300   _Self& operator += (difference_type __offset) {

   301     _M_ite += __offset;

   302     return *this;

   303   }

   304   difference_type operator -(_Self const& __other) const

   305   { return _M_ite - __other._M_ite; }

   307   bool operator == (_Self const& __other) const

   308   { return _M_ite == __other._M_ite; }

   310   bool operator != (_Self const& __other) const

   311   { return _M_ite != __other._M_ite; }

   313   bool operator < (_Self const& __rhs) const

   314   { return _M_ite < __rhs._M_ite; }

   316 private:

   317   _Iterator _M_ite;

   318 };

   320 template <class _Tp, class _Iterator>

   321 struct _IteWrapper<_Tp, _Tp, _Iterator>

   322 { typedef _Iterator _Ite; };

   324 #else

   326 /*

   327  * In this config the storage type is qualified in respect of the

   328  * value_type qualification. Simple reinterpret_cast is enough.

   329  */

   330 template <class _StorageT, class _ValueT>

   331 struct _CastTraits {

   332   typedef _StorageT storage_type;

   333   typedef _ValueT value_type;

   335   static value_type * to_value_type_ptr(storage_type *__ptr)

   336   { return __REINTERPRET_CAST(value_type*, __ptr); }

   337   static value_type const* to_value_type_cptr(storage_type const*__ptr)

   338   { return __REINTERPRET_CAST(value_type const*, __ptr); }

   339   static value_type ** to_value_type_pptr(storage_type **__ptr)

   340   { return __REINTERPRET_CAST(value_type **, __ptr); }

   341   static value_type & to_value_type_ref(storage_type &__ref)

   342   { return __REINTERPRET_CAST(value_type&, __ref); }

   343   static value_type const& to_value_type_cref(storage_type const&__ref)

   344   { return __REINTERPRET_CAST(value_type const&, __ref); }

   345   // Reverse versions

   346   static storage_type * to_storage_type_ptr(value_type *__ptr)

   347   { return __REINTERPRET_CAST(storage_type*, __ptr); }

   348   static storage_type const* to_storage_type_cptr(value_type const*__ptr)

   349   { return __REINTERPRET_CAST(storage_type const*, __ptr); }

   350   static storage_type ** to_storage_type_pptr(value_type **__ptr)

   351   { return __REINTERPRET_CAST(storage_type **, __ptr); }

   352   static storage_type const& to_storage_type_cref(value_type const&__ref)

   353   { return __REINTERPRET_CAST(storage_type const&, __ref); }

   354   template <class _Tp1>

   355   static _Tp1 const& to_storage_type_crefT(_Tp1 const& __ref)

   356   { return __ref; }

   357 };

   359 #endif

   361 //Wrapper functors:

   362 template <class _StorageT, class _ValueT, class _UnaryPredicate>

   363 struct _UnaryPredWrapper {

   364   typedef _CastTraits<_StorageT, _ValueT> cast_traits;

   366   _UnaryPredWrapper (_UnaryPredicate const& __pred) : _M_pred(__pred) {}

   368   bool operator () (_StorageT const& __ref) const

   369   { return _M_pred(cast_traits::to_value_type_cref(__ref)); }

   371 private:

   372   _UnaryPredicate _M_pred;

   373 };

   375 template <class _StorageT, class _ValueT, class _BinaryPredicate>

   376 struct _BinaryPredWrapper {

   377   typedef _CastTraits<_StorageT, _ValueT> cast_traits;

   379   _BinaryPredWrapper () {}

   380   _BinaryPredWrapper (_BinaryPredicate const& __pred) : _M_pred(__pred) {}

   382   _BinaryPredicate get_pred() const { return _M_pred; }

   384   bool operator () (_StorageT const& __fst, _StorageT const& __snd) const

   385   { return _M_pred(cast_traits::to_value_type_cref(__fst), cast_traits::to_value_type_cref(__snd)); }

   387   //Cast operator used to transparently access underlying predicate

   388   //in set::key_comp() method

   389   operator _BinaryPredicate() const

   390   { return _M_pred; }

   392 private:

   393   _BinaryPredicate _M_pred;

   394 };

   396 _STLP_MOVE_TO_STD_NAMESPACE

   398 _STLP_END_NAMESPACE

   400 #endif /* _STLP_POINTERS_SPEC_TOOLS_H */

author	William Roberts <williamr@symbian.org>
	Tue, 16 Mar 2010 16:12:26 +0000
branch	Symbian2
changeset 2	2fe1408b6811
child 4	837f303aceeb
permissions	-rw-r--r--