1 /* 2 * 3 * Copyright (c) 1996,1997 4 * Silicon Graphics Computer Systems, Inc. 5 * 6 * Copyright (c) 1997 7 * Moscow Center for SPARC Technology 8 * 9 * Copyright (c) 1999 10 * Boris Fomitchev 11 * 12 * This material is provided "as is", with absolutely no warranty expressed 13 * or implied. Any use is at your own risk. 14 * 15 * Permission to use or copy this software for any purpose is hereby granted 16 * without fee, provided the above notices are retained on all copies. 17 * Permission to modify the code and to distribute modified code is granted, 18 * provided the above notices are retained, and a notice that the code was 19 * modified is included with the above copyright notice. 20 * 21 */ 22 23 #ifndef _STLP_TYPE_TRAITS_H 24 #define _STLP_TYPE_TRAITS_H 25 26 /* 27 This header file provides a framework for allowing compile time dispatch 28 based on type attributes. This is useful when writing template code. 29 For example, when making a copy of an array of an unknown type, it helps 30 to know if the type has a trivial copy constructor or not, to help decide 31 if a memcpy can be used. 32 33 The class template __type_traits provides a series of typedefs each of 34 which is either __true_type or __false_type. The argument to 35 __type_traits can be any type. The typedefs within this template will 36 attain their correct values by one of these means: 37 1. The general instantiation contain conservative values which work 38 for all types. 39 2. Specializations may be declared to make distinctions between types. 40 3. Some compilers (such as the Silicon Graphics N32 and N64 compilers) 41 will automatically provide the appropriate specializations for all 42 types. 43 44 EXAMPLE: 45 46 //Copy an array of elements which have non-trivial copy constructors 47 template <class T> void copy(T* source, T* destination, int n, __false_type); 48 //Copy an array of elements which have trivial copy constructors. Use memcpy. 49 template <class T> void copy(T* source, T* destination, int n, __true_type); 50 51 //Copy an array of any type by using the most efficient copy mechanism 52 template <class T> inline void copy(T* source,T* destination,int n) { 53 copy(source, destination, n, 54 typename __type_traits<T>::has_trivial_copy_constructor()); 55 } 56 */ 57 58 #ifdef __WATCOMC__ 59 # include <stl/_cwchar.h> 60 #endif 61 62 #ifndef _STLP_TYPE_MANIPS_H 63 # include <stl/type_manips.h> 64 #endif 65 66 #ifdef _STLP_USE_BOOST_SUPPORT 67 # include <stl/boost_type_traits.h> 68 # include <boost/type_traits/add_reference.hpp> 69 # include <boost/type_traits/add_const.hpp> 70 #endif /* _STLP_USE_BOOST_SUPPORT */ 71 72 _STLP_BEGIN_NAMESPACE 73 74 #if !defined (_STLP_USE_BOOST_SUPPORT) 75 76 // The following could be written in terms of numeric_limits. 77 // We're doing it separately to reduce the number of dependencies. 78 79 template <class _Tp> struct _IsIntegral 80 { typedef __false_type _Ret; }; 81 82 # ifndef _STLP_NO_BOOL 83 _STLP_TEMPLATE_NULL struct _IsIntegral<bool> 84 { typedef __true_type _Ret; }; 85 # endif /* _STLP_NO_BOOL */ 86 87 _STLP_TEMPLATE_NULL struct _IsIntegral<char> 88 { typedef __true_type _Ret; }; 89 90 # ifndef _STLP_NO_SIGNED_BUILTINS 91 _STLP_TEMPLATE_NULL struct _IsIntegral<signed char> 92 { typedef __true_type _Ret; }; 93 # endif 94 95 _STLP_TEMPLATE_NULL struct _IsIntegral<unsigned char> 96 { typedef __true_type _Ret; }; 97 98 # if defined ( _STLP_HAS_WCHAR_T ) && ! defined (_STLP_WCHAR_T_IS_USHORT) 99 _STLP_TEMPLATE_NULL struct _IsIntegral<wchar_t> 100 { typedef __true_type _Ret; }; 101 # endif /* _STLP_HAS_WCHAR_T */ 102 103 _STLP_TEMPLATE_NULL struct _IsIntegral<short> 104 { typedef __true_type _Ret; }; 105 106 _STLP_TEMPLATE_NULL struct _IsIntegral<unsigned short> 107 { typedef __true_type _Ret; }; 108 109 _STLP_TEMPLATE_NULL struct _IsIntegral<int> 110 { typedef __true_type _Ret; }; 111 112 _STLP_TEMPLATE_NULL struct _IsIntegral<unsigned int> 113 { typedef __true_type _Ret; }; 114 115 _STLP_TEMPLATE_NULL struct _IsIntegral<long> 116 { typedef __true_type _Ret; }; 117 118 _STLP_TEMPLATE_NULL struct _IsIntegral<unsigned long> 119 { typedef __true_type _Ret; }; 120 121 # ifdef _STLP_LONG_LONG 122 _STLP_TEMPLATE_NULL struct _IsIntegral<_STLP_LONG_LONG> 123 { typedef __true_type _Ret; }; 124 125 _STLP_TEMPLATE_NULL struct _IsIntegral<unsigned _STLP_LONG_LONG> 126 { typedef __true_type _Ret; }; 127 # endif /* _STLP_LONG_LONG */ 128 129 template <class _Tp> struct _IsRational 130 { typedef __false_type _Ret; }; 131 132 _STLP_TEMPLATE_NULL struct _IsRational<float> 133 { typedef __true_type _Ret; }; 134 135 _STLP_TEMPLATE_NULL struct _IsRational<double> 136 { typedef __true_type _Ret; }; 137 138 # if !defined ( _STLP_NO_LONG_DOUBLE ) 139 _STLP_TEMPLATE_NULL struct _IsRational<long double> 140 { typedef __true_type _Ret; }; 141 # endif 142 143 // Forward declarations. 144 template <class _Tp> struct __type_traits; 145 template <class _IsPOD> struct __type_traits_aux { 146 typedef __false_type has_trivial_default_constructor; 147 typedef __false_type has_trivial_copy_constructor; 148 typedef __false_type has_trivial_assignment_operator; 149 typedef __false_type has_trivial_destructor; 150 typedef __false_type is_POD_type; 151 }; 152 153 _STLP_TEMPLATE_NULL 154 struct __type_traits_aux<__false_type> { 155 typedef __false_type has_trivial_default_constructor; 156 typedef __false_type has_trivial_copy_constructor; 157 typedef __false_type has_trivial_assignment_operator; 158 typedef __false_type has_trivial_destructor; 159 typedef __false_type is_POD_type; 160 }; 161 162 _STLP_TEMPLATE_NULL 163 struct __type_traits_aux<__true_type> { 164 typedef __true_type has_trivial_default_constructor; 165 typedef __true_type has_trivial_copy_constructor; 166 typedef __true_type has_trivial_assignment_operator; 167 typedef __true_type has_trivial_destructor; 168 typedef __true_type is_POD_type; 169 }; 170 171 template <class _Tp> 172 struct _IsRef { 173 typedef __false_type _Ret; 174 }; 175 176 # if defined (_STLP_SIMULATE_PARTIAL_SPEC_FOR_TYPE_TRAITS) 177 /* 178 * Boris : simulation technique is used here according to Adobe Open Source License Version 1.0. 179 * Copyright 2000 Adobe Systems Incorporated and others. All rights reserved. 180 * Authors: Mat Marcus and Jesse Jones 181 * The original version of this source code may be found at 182 * http://opensource.adobe.com. 183 */ 184 185 struct _PointerShim { 186 /* 187 * Since the compiler only allows at most one non-trivial 188 * implicit conversion we can make use of a shim class to 189 * be sure that IsPtr below doesn't accept classes with 190 * implicit pointer conversion operators 191 */ 192 _PointerShim(const volatile void*); // no implementation 193 }; 194 195 // These are the discriminating functions 196 char _STLP_CALL _IsP(bool, _PointerShim); // no implementation is required 197 char* _STLP_CALL _IsP(bool, ...); // no implementation is required 198 199 template <class _Tp> 200 struct _IsPtr { 201 /* 202 * This template meta function takes a type T 203 * and returns true exactly when T is a pointer. 204 * One can imagine meta-functions discriminating on 205 * other criteria. 206 */ 207 static _Tp& __null_rep(); 208 enum { _Ptr = (sizeof(_IsP(false,__null_rep())) == sizeof(char)) }; 209 typedef typename __bool2type<_Ptr>::_Ret _Ret; 210 211 }; 212 213 // we make general case dependant on the fact the type is actually a pointer. 214 template <class _Tp> 215 struct __type_traits : __type_traits_aux<typename _IsPtr<_Tp>::_Ret> {}; 216 217 # else /* _STLP_SIMULATE_PARTIAL_SPEC_FOR_TYPE_TRAITS */ 218 219 template <class _Tp> struct _IsPtr { 220 typedef __false_type _Ret; 221 }; 222 223 template <class _Tp> 224 struct __type_traits { 225 typedef __true_type this_dummy_member_must_be_first; 226 /* Do not remove this member. It informs a compiler which 227 automatically specializes __type_traits that this 228 __type_traits template is special. It just makes sure that 229 things work if an implementation is using a template 230 called __type_traits for something unrelated. */ 231 232 /* The following restrictions should be observed for the sake of 233 compilers which automatically produce type specific specializations 234 of this class: 235 - You may reorder the members below if you wish 236 - You may remove any of the members below if you wish 237 - You must not rename members without making the corresponding 238 name change in the compiler 239 - Members you add will be treated like regular members unless 240 241 you add the appropriate support in the compiler. */ 242 # if !defined (_STLP_HAS_TYPE_TRAITS_INTRINSICS) 243 typedef __false_type has_trivial_default_constructor; 244 typedef __false_type has_trivial_copy_constructor; 245 typedef __false_type has_trivial_assignment_operator; 246 typedef __false_type has_trivial_destructor; 247 typedef __false_type is_POD_type; 248 # else 249 typedef typename __bool2type<_STLP_HAS_TRIVIAL_CONSTRUCTOR(_Tp)>::_Ret has_trivial_default_constructor; 250 typedef typename __bool2type<_STLP_HAS_TRIVIAL_COPY(_Tp)>::_Ret has_trivial_copy_constructor; 251 typedef typename __bool2type<_STLP_HAS_TRIVIAL_ASSIGN(_Tp)>::_Ret has_trivial_assignment_operator; 252 typedef typename __bool2type<_STLP_HAS_TRIVIAL_DESTRUCTOR(_Tp)>::_Ret has_trivial_destructor; 253 typedef typename __bool2type<_STLP_IS_POD(_Tp)>::_Ret is_POD_type; 254 # endif 255 }; 256 257 # if defined (_STLP_CLASS_PARTIAL_SPECIALIZATION) 258 template <class _Tp> struct _IsPtr<_Tp*> 259 { typedef __true_type _Ret; }; 260 template <class _Tp> struct _IsRef<_Tp&> 261 { typedef __true_type _Ret; }; 262 263 template <class _Tp> struct __type_traits<_Tp*> : __type_traits_aux<__true_type> 264 {}; 265 # endif /* _STLP_CLASS_PARTIAL_SPECIALIZATION */ 266 267 # endif /* _STLP_SIMULATE_PARTIAL_SPEC_FOR_TYPE_TRAITS */ 268 269 // Provide some specializations. This is harmless for compilers that 270 // have built-in __types_traits support, and essential for compilers 271 // that don't. 272 # if !defined (_STLP_QUALIFIED_SPECIALIZATION_BUG) 273 # define _STLP_DEFINE_TYPE_TRAITS_FOR(Type) \ 274 _STLP_TEMPLATE_NULL struct __type_traits< Type > : __type_traits_aux<__true_type> {}; \ 275 _STLP_TEMPLATE_NULL struct __type_traits< const Type > : __type_traits_aux<__true_type> {}; \ 276 _STLP_TEMPLATE_NULL struct __type_traits< volatile Type > : __type_traits_aux<__true_type> {}; \ 277 _STLP_TEMPLATE_NULL struct __type_traits< const volatile Type > : __type_traits_aux<__true_type> {} 278 # else 279 # define _STLP_DEFINE_TYPE_TRAITS_FOR(Type) \ 280 _STLP_TEMPLATE_NULL struct __type_traits< Type > : __type_traits_aux<__true_type> {}; 281 # endif 282 283 # ifndef _STLP_NO_BOOL 284 _STLP_DEFINE_TYPE_TRAITS_FOR(bool); 285 # endif /* _STLP_NO_BOOL */ 286 _STLP_DEFINE_TYPE_TRAITS_FOR(char); 287 # ifndef _STLP_NO_SIGNED_BUILTINS 288 _STLP_DEFINE_TYPE_TRAITS_FOR(signed char); 289 # endif 290 _STLP_DEFINE_TYPE_TRAITS_FOR(unsigned char); 291 # if defined ( _STLP_HAS_WCHAR_T ) && ! defined (_STLP_WCHAR_T_IS_USHORT) 292 _STLP_DEFINE_TYPE_TRAITS_FOR(wchar_t); 293 # endif /* _STLP_HAS_WCHAR_T */ 294 295 _STLP_DEFINE_TYPE_TRAITS_FOR(short); 296 _STLP_DEFINE_TYPE_TRAITS_FOR(unsigned short); 297 _STLP_DEFINE_TYPE_TRAITS_FOR(int); 298 _STLP_DEFINE_TYPE_TRAITS_FOR(unsigned int); 299 _STLP_DEFINE_TYPE_TRAITS_FOR(long); 300 _STLP_DEFINE_TYPE_TRAITS_FOR(unsigned long); 301 302 # ifdef _STLP_LONG_LONG 303 _STLP_DEFINE_TYPE_TRAITS_FOR(_STLP_LONG_LONG); 304 _STLP_DEFINE_TYPE_TRAITS_FOR(unsigned _STLP_LONG_LONG); 305 # endif /* _STLP_LONG_LONG */ 306 307 _STLP_DEFINE_TYPE_TRAITS_FOR(float); 308 _STLP_DEFINE_TYPE_TRAITS_FOR(double); 309 310 # if !defined ( _STLP_NO_LONG_DOUBLE ) 311 _STLP_DEFINE_TYPE_TRAITS_FOR(long double); 312 # endif 313 314 # if defined (_STLP_CLASS_PARTIAL_SPECIALIZATION) 315 template <class _ArePtrs, class _Src, class _Dst> 316 struct _IsCVConvertibleIf 317 { typedef typename _IsCVConvertible<_Src, _Dst>::_Ret _Ret; }; 318 319 template <class _Src, class _Dst> 320 struct _IsCVConvertibleIf<__false_type, _Src, _Dst> 321 { typedef __false_type _Ret; }; 322 # else 323 # if defined (_STLP_MEMBER_TEMPLATE_CLASSES) 324 template <class _ArePtrs> 325 struct _IsCVConvertibleIfAux { 326 template <class _Src, class _Dst> 327 struct _In 328 { typedef typename _IsCVConvertible<_Src, _Dst>::_Ret _Ret; }; 329 }; 330 331 _STLP_TEMPLATE_NULL 332 struct _IsCVConvertibleIfAux<__false_type> { 333 template <class _Src, class _Dst> 334 struct _In 335 { typedef __false_type _Ret; }; 336 }; 337 338 template <class _ArePtrs, class _Src, class _Dst> 339 struct _IsCVConvertibleIf { 340 typedef typename _IsCVConvertibleIfAux<_ArePtrs>::_STLP_TEMPLATE _In<_Src, _Dst>::_Ret _Ret; 341 }; 342 # else 343 /* default behavior: we prefer to miss an optimization rather than taking the risk of 344 * a compilation error if playing with types with exotic memory alignment. 345 */ 346 template <class _ArePtrs, class _Src, class _Dst> 347 struct _IsCVConvertibleIf 348 { typedef __false_type _Ret; }; 349 # endif 350 # endif 351 352 template <class _Src, class _Dst> 353 struct _TrivialNativeTypeCopy { 354 typedef typename _IsPtr<_Src>::_Ret _Ptr1; 355 typedef typename _IsPtr<_Dst>::_Ret _Ptr2; 356 typedef typename _Land2<_Ptr1, _Ptr2>::_Ret _BothPtrs; 357 typedef typename _IsCVConvertibleIf<_BothPtrs, _Src, _Dst>::_Ret _Convertible; 358 typedef typename _Land2<_BothPtrs, _Convertible>::_Ret _Trivial1; 359 360 typedef typename __bool2type<(sizeof(_Src) == sizeof(_Dst))>::_Ret _SameSize; 361 362 #if !defined (__BORLANDC__) || (__BORLANDC__ < 0x564) 363 typedef typename _IsIntegral<_Src>::_Ret _Int1; 364 #else 365 typedef typename _UnQual<_Src>::_Type _UnQuSrc; 366 typedef typename _IsIntegral<_UnQuSrc>::_Ret _Int1; 367 #endif 368 typedef typename _IsIntegral<_Dst>::_Ret _Int2; 369 typedef typename _Land2<_Int1, _Int2>::_Ret _BothInts; 370 371 typedef typename _IsRational<_Src>::_Ret _Rat1; 372 typedef typename _IsRational<_Dst>::_Ret _Rat2; 373 typedef typename _Land2<_Rat1, _Rat2>::_Ret _BothRats; 374 375 typedef typename _Lor2<_BothInts, _BothRats>::_Ret _BothNatives; 376 #if !defined (__BORLANDC__) || (__BORLANDC__ >= 0x564) 377 typedef typename _Land2<_BothNatives, _SameSize>::_Ret _Trivial2; 378 #else 379 typedef typename _IsUnQual<_Dst>::_Ret _UnQualDst; 380 typedef typename _Land3<_BothNatives, _SameSize, _UnQualDst>::_Ret _Trivial2; 381 #endif 382 typedef typename _Lor2<_Trivial1, _Trivial2>::_Ret _Ret; 383 }; 384 385 template <class _Src, class _Dst> 386 struct _TrivialCopy { 387 typedef typename _TrivialNativeTypeCopy<_Src, _Dst>::_Ret _NativeRet; 388 # if !defined (__BORLANDC__) || (__BORLANDC__ != 0x560) 389 typedef typename __type_traits<_Src>::has_trivial_assignment_operator _Tr1; 390 # else 391 typedef typename _UnConstPtr<_Src*>::_Type _UnConstSrc; 392 typedef typename __type_traits<_UnConstSrc>::has_trivial_assignment_operator _Tr1; 393 # endif 394 typedef typename _AreCopyable<_Src, _Dst>::_Ret _Tr2; 395 typedef typename _Land2<_Tr1, _Tr2>::_Ret _UserRet; 396 typedef typename _Lor2<_NativeRet, _UserRet>::_Ret _Ret; 397 static _Ret _Answer() { return _Ret(); } 398 }; 399 400 template <class _Src, class _Dst> 401 struct _TrivialUCopy { 402 typedef typename _TrivialNativeTypeCopy<_Src, _Dst>::_Ret _NativeRet; 403 # if !defined (__BORLANDC__) || (__BORLANDC__ != 0x560) 404 typedef typename __type_traits<_Src>::has_trivial_copy_constructor _Tr1; 405 # else 406 typedef typename _UnConstPtr<_Src*>::_Type _UnConstSrc; 407 typedef typename __type_traits<_UnConstSrc>::has_trivial_copy_constructor _Tr1; 408 # endif 409 typedef typename _AreCopyable<_Src, _Dst>::_Ret _Tr2; 410 typedef typename _Land2<_Tr1, _Tr2>::_Ret _UserRet; 411 typedef typename _Lor2<_NativeRet, _UserRet>::_Ret _Ret; 412 static _Ret _Answer() { return _Ret(); } 413 }; 414 415 template <class _Tp> 416 struct _DefaultZeroValue { 417 typedef typename _IsIntegral<_Tp>::_Ret _Tr1; 418 typedef typename _IsRational<_Tp>::_Ret _Tr2; 419 typedef typename _IsPtr<_Tp>::_Ret _Tr3; 420 typedef typename _Lor3<_Tr1, _Tr2, _Tr3>::_Ret _Ret; 421 }; 422 423 template <class _Tp> 424 struct _TrivialInit { 425 # if !defined (__BORLANDC__) || (__BORLANDC__ != 0x560) 426 typedef typename __type_traits<_Tp>::has_trivial_default_constructor _Tr1; 427 # else 428 typedef typename _UnConstPtr<_Tp*>::_Type _Tp1; 429 typedef typename __type_traits<_Tp1>::has_trivial_copy_constructor _Tr1; 430 # endif 431 typedef typename _DefaultZeroValue<_Tp>::_Ret _Tr2; 432 typedef typename _Not<_Tr2>::_Ret _Tr3; 433 typedef typename _Land2<_Tr1, _Tr3>::_Ret _Ret; 434 static _Ret _Answer() { return _Ret(); } 435 }; 436 437 #endif /* !_STLP_USE_BOOST_SUPPORT */ 438 439 template <class _Tp> 440 struct _IsPtrType { 441 typedef typename _IsPtr<_Tp>::_Ret _Type; 442 static _Type _Ret() { return _Type(); } 443 }; 444 445 template <class _Tp> 446 struct _IsRefType { 447 typedef typename _IsRef<_Tp>::_Ret _Type; 448 static _Type _Ret() { return _Type();} 449 }; 450 451 template <class _Tp> 452 struct __call_traits { 453 #if defined (_STLP_USE_BOOST_SUPPORT) && !defined (_STLP_NO_EXTENSIONS) 454 typedef typename __select< ::boost::is_reference<_Tp>::value, 455 typename ::boost::add_const<_Tp>::type, 456 typename ::boost::add_reference< typename ::boost::add_const<_Tp>::type >::type>::_Ret const_param_type; 457 typedef typename __select< ::boost::is_reference<_Tp>::value, 458 typename ::boost::remove_const<_Tp>::type, 459 typename ::boost::add_reference<_Tp>::type>::_Ret param_type; 460 #else 461 typedef const _Tp& const_param_type; 462 typedef _Tp& param_type; 463 #endif 464 }; 465 466 #if !defined (_STLP_USE_BOOST_SUPPORT) && !defined (_STLP_NO_EXTENSIONS) && defined (_STLP_CLASS_PARTIAL_SPECIALIZATION) 467 template <class _Tp> 468 struct __call_traits<_Tp&> { 469 typedef _Tp& param_type; 470 typedef const _Tp& const_param_type; 471 }; 472 template <class _Tp> 473 struct __call_traits<const _Tp&> { 474 typedef _Tp& param_type; 475 typedef const _Tp& const_param_type; 476 }; 477 #endif 478 479 template <class _Tp1, class _Tp2> 480 struct _BothPtrType { 481 typedef typename _IsPtr<_Tp1>::_Ret _IsPtr1; 482 typedef typename _IsPtr<_Tp2>::_Ret _IsPtr2; 483 484 typedef typename _Land2<_IsPtr1, _IsPtr2>::_Ret _Ret; 485 static _Ret _Answer() { return _Ret(); } 486 }; 487 488 template <class _Tp1, class _Tp2, class _IsRef1, class _IsRef2> 489 struct _OKToSwap { 490 typedef typename _AreSameTypes<_Tp1, _Tp2>::_Ret _Same; 491 typedef typename _Land3<_Same, _IsRef1, _IsRef2>::_Ret _Type; 492 static _Type _Answer() { return _Type(); } 493 }; 494 495 template <class _Tp1, class _Tp2, class _IsRef1, class _IsRef2> 496 inline _OKToSwap<_Tp1, _Tp2, _IsRef1, _IsRef2> 497 _IsOKToSwap(_Tp1*, _Tp2*, const _IsRef1&, const _IsRef2&) 498 { return _OKToSwap<_Tp1, _Tp2, _IsRef1, _IsRef2>(); } 499 500 template <class _Src, class _Dst> 501 inline _TrivialCopy<_Src, _Dst> _UseTrivialCopy(_Src*, _Dst*) 502 { return _TrivialCopy<_Src, _Dst>(); } 503 504 template <class _Src, class _Dst> 505 inline _TrivialUCopy<_Src, _Dst> _UseTrivialUCopy(_Src*, _Dst*) 506 { return _TrivialUCopy<_Src, _Dst>(); } 507 508 #if defined (_STLP_FUNCTION_TMPL_PARTIAL_ORDER) || defined (__BORLANDC__) || \ 509 defined (__DMC__) 510 struct _NegativeAnswer { 511 typedef __false_type _Ret; 512 static _Ret _Answer() { return _Ret(); } 513 }; 514 515 template <class _Src, class _Dst> 516 inline _NegativeAnswer _UseTrivialCopy(_Src*, const _Dst*) 517 { return _NegativeAnswer(); } 518 519 template <class _Src, class _Dst> 520 inline _NegativeAnswer _UseTrivialCopy(_Src*, volatile _Dst*) 521 { return _NegativeAnswer(); } 522 523 template <class _Src, class _Dst> 524 inline _NegativeAnswer _UseTrivialCopy(_Src*, const volatile _Dst*) 525 { return _NegativeAnswer(); } 526 527 template <class _Src, class _Dst> 528 inline _NegativeAnswer _UseTrivialUCopy(_Src*, const _Dst*) 529 { return _NegativeAnswer(); } 530 531 template <class _Src, class _Dst> 532 inline _NegativeAnswer _UseTrivialUCopy(_Src*, volatile _Dst*) 533 { return _NegativeAnswer(); } 534 535 template <class _Src, class _Dst> 536 inline _NegativeAnswer _UseTrivialUCopy(_Src*, const volatile _Dst*) 537 { return _NegativeAnswer(); } 538 #endif 539 540 template <class _Tp> 541 inline _TrivialInit<_Tp> _UseTrivialInit(_Tp*) 542 { return _TrivialInit<_Tp>(); } 543 544 template <class _Tp> 545 struct _IsPOD { 546 typedef typename __type_traits<_Tp>::is_POD_type _Type; 547 static _Type _Answer() { return _Type(); } 548 }; 549 550 template <class _Tp> 551 inline _IsPOD<_Tp> _Is_POD(_Tp*) 552 { return _IsPOD<_Tp>(); } 553 554 template <class _Tp> 555 struct _DefaultZeroValueQuestion { 556 typedef typename _DefaultZeroValue<_Tp>::_Ret _Ret; 557 static _Ret _Answer() { return _Ret(); } 558 }; 559 560 template <class _Tp> 561 inline _DefaultZeroValueQuestion<_Tp> _HasDefaultZeroValue(_Tp*) 562 { return _DefaultZeroValueQuestion<_Tp>(); } 563 564 /* 565 * Base class used: 566 * - to simulate partial template specialization 567 * - to simulate partial function ordering 568 * - to recognize STLport class from user specialized one 569 */ 570 template <class _Tp> 571 struct __stlport_class 572 { typedef _Tp _Type; }; 573 574 template <class _Tp> 575 struct _IsSTLportClass { 576 typedef typename _IsConvertible<_Tp, __stlport_class<_Tp> >::_Ret _Ret; 577 #if defined (__BORLANDC__) 578 enum { _Is = _IsConvertible<_Tp, __stlport_class<_Tp> >::value }; 579 #endif 580 }; 581 582 #if defined (_STLP_USE_PARTIAL_SPEC_WORKAROUND) && !defined (_STLP_FUNCTION_TMPL_PARTIAL_ORDER) 583 template <class _Tp> 584 struct _SwapImplemented { 585 typedef typename _IsSTLportClass<_Tp>::_Ret _Ret; 586 # if defined (__BORLANDC__) 587 enum { _Is = _IsSTLportClass<_Tp>::_Is }; 588 # endif 589 }; 590 #endif 591 592 template <class _Tp> 593 class _TpWithState : private _Tp { 594 _TpWithState(); 595 int _state; 596 }; 597 598 /* This is an internal helper struct used to guess if we are working 599 * on a stateless class. It can only be instanciated with a class type. */ 600 template <class _Tp> 601 struct _IsStateless { 602 enum { _Is = sizeof(_TpWithState<_Tp>) == sizeof(int) }; 603 typedef typename __bool2type<_Is>::_Ret _Ret; 604 }; 605 606 _STLP_END_NAMESPACE 607 608 #ifdef _STLP_CLASS_PARTIAL_SPECIALIZATION 609 # if defined (__BORLANDC__) || \ 610 defined (__SUNPRO_CC) || \ 611 (defined (__MWERKS__) && (__MWERKS__ <= 0x2303)) || \ 612 (defined (__sgi) && defined (_COMPILER_VERSION)) || \ 613 defined (__DMC__) 614 # define _STLP_IS_POD_ITER(_It, _Tp) __type_traits< typename iterator_traits< _Tp >::value_type >::is_POD_type() 615 # else 616 # define _STLP_IS_POD_ITER(_It, _Tp) typename __type_traits< typename iterator_traits< _Tp >::value_type >::is_POD_type() 617 # endif 618 #else 619 # define _STLP_IS_POD_ITER(_It, _Tp) _Is_POD( _STLP_VALUE_TYPE( _It, _Tp ) )._Answer() 620 #endif 621 622 #endif /* _STLP_TYPE_TRAITS_H */ 623 624 // Local Variables: 625 // mode:C++ 626 // End: 627
