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1// The template and inlines for the -*- C++ -*- internal _Meta class.
2
3// Copyright (C) 1997-2018 Free Software Foundation, Inc.
4//
5// This file is part of the GNU ISO C++ Library. This library is free
6// software; you can redistribute it and/or modify it under the
7// terms of the GNU General Public License as published by the
8// Free Software Foundation; either version 3, or (at your option)
9// any later version.
10
11// This library is distributed in the hope that it will be useful,
12// but WITHOUT ANY WARRANTY; without even the implied warranty of
13// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14// GNU General Public License for more details.
15
16// Under Section 7 of GPL version 3, you are granted additional
17// permissions described in the GCC Runtime Library Exception, version
18// 3.1, as published by the Free Software Foundation.
19
20// You should have received a copy of the GNU General Public License and
21// a copy of the GCC Runtime Library Exception along with this program;
22// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23// <http://www.gnu.org/licenses/>.
24
25/** @file bits/valarray_before.h
26 * This is an internal header file, included by other library headers.
27 * Do not attempt to use it directly. @headername{valarray}
28 */
29
30// Written by Gabriel Dos Reis <Gabriel.Dos-Reis@cmla.ens-cachan.fr>
31
32#ifndef _VALARRAY_BEFORE_H
33#define _VALARRAY_BEFORE_H 1
34
35#pragma GCC system_header
36
37#include <bits/slice_array.h>
38
39namespace std _GLIBCXX_VISIBILITY(default)
40{
41_GLIBCXX_BEGIN_NAMESPACE_VERSION
42
43 //
44 // Implementing a loosened valarray return value is tricky.
45 // First we need to meet 26.3.1/3: we should not add more than
46 // two levels of template nesting. Therefore we resort to template
47 // template to "flatten" loosened return value types.
48 // At some point we use partial specialization to remove one level
49 // template nesting due to _Expr<>
50 //
51
52 // This class is NOT defined. It doesn't need to.
53 template<typename _Tp1, typename _Tp2> class _Constant;
54
55 // Implementations of unary functions applied to valarray<>s.
56 // I use hard-coded object functions here instead of a generic
57 // approach like pointers to function:
58 // 1) correctness: some functions take references, others values.
59 // we can't deduce the correct type afterwards.
60 // 2) efficiency -- object functions can be easily inlined
61 // 3) be Koenig-lookup-friendly
62
63 struct _Abs
64 {
65 template<typename _Tp>
66 _Tp operator()(const _Tp& __t) const
67 { return abs(__t); }
68 };
69
70 struct _Cos
71 {
72 template<typename _Tp>
73 _Tp operator()(const _Tp& __t) const
74 { return cos(__t); }
75 };
76
77 struct _Acos
78 {
79 template<typename _Tp>
80 _Tp operator()(const _Tp& __t) const
81 { return acos(__t); }
82 };
83
84 struct _Cosh
85 {
86 template<typename _Tp>
87 _Tp operator()(const _Tp& __t) const
88 { return cosh(__t); }
89 };
90
91 struct _Sin
92 {
93 template<typename _Tp>
94 _Tp operator()(const _Tp& __t) const
95 { return sin(__t); }
96 };
97
98 struct _Asin
99 {
100 template<typename _Tp>
101 _Tp operator()(const _Tp& __t) const
102 { return asin(__t); }
103 };
104
105 struct _Sinh
106 {
107 template<typename _Tp>
108 _Tp operator()(const _Tp& __t) const
109 { return sinh(__t); }
110 };
111
112 struct _Tan
113 {
114 template<typename _Tp>
115 _Tp operator()(const _Tp& __t) const
116 { return tan(__t); }
117 };
118
119 struct _Atan
120 {
121 template<typename _Tp>
122 _Tp operator()(const _Tp& __t) const
123 { return atan(__t); }
124 };
125
126 struct _Tanh
127 {
128 template<typename _Tp>
129 _Tp operator()(const _Tp& __t) const
130 { return tanh(__t); }
131 };
132
133 struct _Exp
134 {
135 template<typename _Tp>
136 _Tp operator()(const _Tp& __t) const
137 { return exp(__t); }
138 };
139
140 struct _Log
141 {
142 template<typename _Tp>
143 _Tp operator()(const _Tp& __t) const
144 { return log(__t); }
145 };
146
147 struct _Log10
148 {
149 template<typename _Tp>
150 _Tp operator()(const _Tp& __t) const
151 { return log10(__t); }
152 };
153
154 struct _Sqrt
155 {
156 template<typename _Tp>
157 _Tp operator()(const _Tp& __t) const
158 { return sqrt(__t); }
159 };
160
161 // In the past, we used to tailor operator applications semantics
162 // to the specialization of standard function objects (i.e. plus<>, etc.)
163 // That is incorrect. Therefore we provide our own surrogates.
164
165 struct __unary_plus
166 {
167 template<typename _Tp>
168 _Tp operator()(const _Tp& __t) const
169 { return +__t; }
170 };
171
172 struct __negate
173 {
174 template<typename _Tp>
175 _Tp operator()(const _Tp& __t) const
176 { return -__t; }
177 };
178
179 struct __bitwise_not
180 {
181 template<typename _Tp>
182 _Tp operator()(const _Tp& __t) const
183 { return ~__t; }
184 };
185
186 struct __plus
187 {
188 template<typename _Tp>
189 _Tp operator()(const _Tp& __x, const _Tp& __y) const
190 { return __x + __y; }
191 };
192
193 struct __minus
194 {
195 template<typename _Tp>
196 _Tp operator()(const _Tp& __x, const _Tp& __y) const
197 { return __x - __y; }
198 };
199
200 struct __multiplies
201 {
202 template<typename _Tp>
203 _Tp operator()(const _Tp& __x, const _Tp& __y) const
204 { return __x * __y; }
205 };
206
207 struct __divides
208 {
209 template<typename _Tp>
210 _Tp operator()(const _Tp& __x, const _Tp& __y) const
211 { return __x / __y; }
212 };
213
214 struct __modulus
215 {
216 template<typename _Tp>
217 _Tp operator()(const _Tp& __x, const _Tp& __y) const
218 { return __x % __y; }
219 };
220
221 struct __bitwise_xor
222 {
223 template<typename _Tp>
224 _Tp operator()(const _Tp& __x, const _Tp& __y) const
225 { return __x ^ __y; }
226 };
227
228 struct __bitwise_and
229 {
230 template<typename _Tp>
231 _Tp operator()(const _Tp& __x, const _Tp& __y) const
232 { return __x & __y; }
233 };
234
235 struct __bitwise_or
236 {
237 template<typename _Tp>
238 _Tp operator()(const _Tp& __x, const _Tp& __y) const
239 { return __x | __y; }
240 };
241
242 struct __shift_left
243 {
244 template<typename _Tp>
245 _Tp operator()(const _Tp& __x, const _Tp& __y) const
246 { return __x << __y; }
247 };
248
249 struct __shift_right
250 {
251 template<typename _Tp>
252 _Tp operator()(const _Tp& __x, const _Tp& __y) const
253 { return __x >> __y; }
254 };
255
256 struct __logical_and
257 {
258 template<typename _Tp>
259 bool operator()(const _Tp& __x, const _Tp& __y) const
260 { return __x && __y; }
261 };
262
263 struct __logical_or
264 {
265 template<typename _Tp>
266 bool operator()(const _Tp& __x, const _Tp& __y) const
267 { return __x || __y; }
268 };
269
270 struct __logical_not
271 {
272 template<typename _Tp>
273 bool operator()(const _Tp& __x) const
274 { return !__x; }
275 };
276
277 struct __equal_to
278 {
279 template<typename _Tp>
280 bool operator()(const _Tp& __x, const _Tp& __y) const
281 { return __x == __y; }
282 };
283
284 struct __not_equal_to
285 {
286 template<typename _Tp>
287 bool operator()(const _Tp& __x, const _Tp& __y) const
288 { return __x != __y; }
289 };
290
291 struct __less
292 {
293 template<typename _Tp>
294 bool operator()(const _Tp& __x, const _Tp& __y) const
295 { return __x < __y; }
296 };
297
298 struct __greater
299 {
300 template<typename _Tp>
301 bool operator()(const _Tp& __x, const _Tp& __y) const
302 { return __x > __y; }
303 };
304
305 struct __less_equal
306 {
307 template<typename _Tp>
308 bool operator()(const _Tp& __x, const _Tp& __y) const
309 { return __x <= __y; }
310 };
311
312 struct __greater_equal
313 {
314 template<typename _Tp>
315 bool operator()(const _Tp& __x, const _Tp& __y) const
316 { return __x >= __y; }
317 };
318
319 // The few binary functions we miss.
320 struct _Atan2
321 {
322 template<typename _Tp>
323 _Tp operator()(const _Tp& __x, const _Tp& __y) const
324 { return atan2(__x, __y); }
325 };
326
327 struct _Pow
328 {
329 template<typename _Tp>
330 _Tp operator()(const _Tp& __x, const _Tp& __y) const
331 { return pow(__x, __y); }
332 };
333
334 template<typename _Tp, bool _IsValidValarrayValue = !__is_abstract(_Tp)>
335 struct __fun_with_valarray
336 {
337 typedef _Tp result_type;
338 };
339
340 template<typename _Tp>
341 struct __fun_with_valarray<_Tp, false>
342 {
343 // No result type defined for invalid value types.
344 };
345
346 // We need these bits in order to recover the return type of
347 // some functions/operators now that we're no longer using
348 // function templates.
349 template<typename, typename _Tp>
350 struct __fun : __fun_with_valarray<_Tp>
351 {
352 };
353
354 // several specializations for relational operators.
355 template<typename _Tp>
356 struct __fun<__logical_not, _Tp>
357 {
358 typedef bool result_type;
359 };
360
361 template<typename _Tp>
362 struct __fun<__logical_and, _Tp>
363 {
364 typedef bool result_type;
365 };
366
367 template<typename _Tp>
368 struct __fun<__logical_or, _Tp>
369 {
370 typedef bool result_type;
371 };
372
373 template<typename _Tp>
374 struct __fun<__less, _Tp>
375 {
376 typedef bool result_type;
377 };
378
379 template<typename _Tp>
380 struct __fun<__greater, _Tp>
381 {
382 typedef bool result_type;
383 };
384
385 template<typename _Tp>
386 struct __fun<__less_equal, _Tp>
387 {
388 typedef bool result_type;
389 };
390
391 template<typename _Tp>
392 struct __fun<__greater_equal, _Tp>
393 {
394 typedef bool result_type;
395 };
396
397 template<typename _Tp>
398 struct __fun<__equal_to, _Tp>
399 {
400 typedef bool result_type;
401 };
402
403 template<typename _Tp>
404 struct __fun<__not_equal_to, _Tp>
405 {
406 typedef bool result_type;
407 };
408
409 //
410 // Apply function taking a value/const reference closure
411 //
412
413 template<typename _Dom, typename _Arg>
414 class _FunBase
415 {
416 public:
417 typedef typename _Dom::value_type value_type;
418
419 _FunBase(const _Dom& __e, value_type __f(_Arg))
420 : _M_expr(__e), _M_func(__f) {}
421
422 value_type operator[](size_t __i) const
423 { return _M_func (_M_expr[__i]); }
424
425 size_t size() const { return _M_expr.size ();}
426
427 private:
428 const _Dom& _M_expr;
429 value_type (*_M_func)(_Arg);
430 };
431
432 template<class _Dom>
433 struct _ValFunClos<_Expr,_Dom> : _FunBase<_Dom, typename _Dom::value_type>
434 {
435 typedef _FunBase<_Dom, typename _Dom::value_type> _Base;
436 typedef typename _Base::value_type value_type;
437 typedef value_type _Tp;
438
439 _ValFunClos(const _Dom& __e, _Tp __f(_Tp)) : _Base(__e, __f) {}
440 };
441
442 template<typename _Tp>
443 struct _ValFunClos<_ValArray,_Tp> : _FunBase<valarray<_Tp>, _Tp>
444 {
445 typedef _FunBase<valarray<_Tp>, _Tp> _Base;
446 typedef _Tp value_type;
447
448 _ValFunClos(const valarray<_Tp>& __v, _Tp __f(_Tp)) : _Base(__v, __f) {}
449 };
450
451 template<class _Dom>
452 struct _RefFunClos<_Expr, _Dom>
453 : _FunBase<_Dom, const typename _Dom::value_type&>
454 {
455 typedef _FunBase<_Dom, const typename _Dom::value_type&> _Base;
456 typedef typename _Base::value_type value_type;
457 typedef value_type _Tp;
458
459 _RefFunClos(const _Dom& __e, _Tp __f(const _Tp&))
460 : _Base(__e, __f) {}
461 };
462
463 template<typename _Tp>
464 struct _RefFunClos<_ValArray, _Tp>
465 : _FunBase<valarray<_Tp>, const _Tp&>
466 {
467 typedef _FunBase<valarray<_Tp>, const _Tp&> _Base;
468 typedef _Tp value_type;
469
470 _RefFunClos(const valarray<_Tp>& __v, _Tp __f(const _Tp&))
471 : _Base(__v, __f) {}
472 };
473
474 //
475 // Unary expression closure.
476 //
477
478 template<class _Oper, class _Arg>
479 class _UnBase
480 {
481 public:
482 typedef typename _Arg::value_type _Vt;
483 typedef typename __fun<_Oper, _Vt>::result_type value_type;
484
485 _UnBase(const _Arg& __e) : _M_expr(__e) {}
486
487 value_type operator[](size_t __i) const
488 { return _Oper()(_M_expr[__i]); }
489
490 size_t size() const { return _M_expr.size(); }
491
492 private:
493 const _Arg& _M_expr;
494 };
495
496 template<class _Oper, class _Dom>
497 struct _UnClos<_Oper, _Expr, _Dom>
498 : _UnBase<_Oper, _Dom>
499 {
500 typedef _Dom _Arg;
501 typedef _UnBase<_Oper, _Dom> _Base;
502 typedef typename _Base::value_type value_type;
503
504 _UnClos(const _Arg& __e) : _Base(__e) {}
505 };
506
507 template<class _Oper, typename _Tp>
508 struct _UnClos<_Oper, _ValArray, _Tp>
509 : _UnBase<_Oper, valarray<_Tp> >
510 {
511 typedef valarray<_Tp> _Arg;
512 typedef _UnBase<_Oper, valarray<_Tp> > _Base;
513 typedef typename _Base::value_type value_type;
514
515 _UnClos(const _Arg& __e) : _Base(__e) {}
516 };
517
518
519 //
520 // Binary expression closure.
521 //
522
523 template<class _Oper, class _FirstArg, class _SecondArg>
524 class _BinBase
525 {
526 public:
527 typedef typename _FirstArg::value_type _Vt;
528 typedef typename __fun<_Oper, _Vt>::result_type value_type;
529
530 _BinBase(const _FirstArg& __e1, const _SecondArg& __e2)
531 : _M_expr1(__e1), _M_expr2(__e2) {}
532
533 value_type operator[](size_t __i) const
534 { return _Oper()(_M_expr1[__i], _M_expr2[__i]); }
535
536 size_t size() const { return _M_expr1.size(); }
537
538 private:
539 const _FirstArg& _M_expr1;
540 const _SecondArg& _M_expr2;
541 };
542
543
544 template<class _Oper, class _Clos>
545 class _BinBase2
546 {
547 public:
548 typedef typename _Clos::value_type _Vt;
549 typedef typename __fun<_Oper, _Vt>::result_type value_type;
550
551 _BinBase2(const _Clos& __e, const _Vt& __t)
552 : _M_expr1(__e), _M_expr2(__t) {}
553
554 value_type operator[](size_t __i) const
555 { return _Oper()(_M_expr1[__i], _M_expr2); }
556
557 size_t size() const { return _M_expr1.size(); }
558
559 private:
560 const _Clos& _M_expr1;
561 const _Vt& _M_expr2;
562 };
563
564 template<class _Oper, class _Clos>
565 class _BinBase1
566 {
567 public:
568 typedef typename _Clos::value_type _Vt;
569 typedef typename __fun<_Oper, _Vt>::result_type value_type;
570
571 _BinBase1(const _Vt& __t, const _Clos& __e)
572 : _M_expr1(__t), _M_expr2(__e) {}
573
574 value_type operator[](size_t __i) const
575 { return _Oper()(_M_expr1, _M_expr2[__i]); }
576
577 size_t size() const { return _M_expr2.size(); }
578
579 private:
580 const _Vt& _M_expr1;
581 const _Clos& _M_expr2;
582 };
583
584 template<class _Oper, class _Dom1, class _Dom2>
585 struct _BinClos<_Oper, _Expr, _Expr, _Dom1, _Dom2>
586 : _BinBase<_Oper, _Dom1, _Dom2>
587 {
588 typedef _BinBase<_Oper, _Dom1, _Dom2> _Base;
589 typedef typename _Base::value_type value_type;
590
591 _BinClos(const _Dom1& __e1, const _Dom2& __e2) : _Base(__e1, __e2) {}
592 };
593
594 template<class _Oper, typename _Tp>
595 struct _BinClos<_Oper,_ValArray, _ValArray, _Tp, _Tp>
596 : _BinBase<_Oper, valarray<_Tp>, valarray<_Tp> >
597 {
598 typedef _BinBase<_Oper, valarray<_Tp>, valarray<_Tp> > _Base;
599 typedef typename _Base::value_type value_type;
600
601 _BinClos(const valarray<_Tp>& __v, const valarray<_Tp>& __w)
602 : _Base(__v, __w) {}
603 };
604
605 template<class _Oper, class _Dom>
606 struct _BinClos<_Oper, _Expr, _ValArray, _Dom, typename _Dom::value_type>
607 : _BinBase<_Oper, _Dom, valarray<typename _Dom::value_type> >
608 {
609 typedef typename _Dom::value_type _Tp;
610 typedef _BinBase<_Oper,_Dom,valarray<_Tp> > _Base;
611 typedef typename _Base::value_type value_type;
612
613 _BinClos(const _Dom& __e1, const valarray<_Tp>& __e2)
614 : _Base(__e1, __e2) {}
615 };
616
617 template<class _Oper, class _Dom>
618 struct _BinClos<_Oper, _ValArray, _Expr, typename _Dom::value_type, _Dom>
619 : _BinBase<_Oper, valarray<typename _Dom::value_type>,_Dom>
620 {
621 typedef typename _Dom::value_type _Tp;
622 typedef _BinBase<_Oper, valarray<_Tp>, _Dom> _Base;
623 typedef typename _Base::value_type value_type;
624
625 _BinClos(const valarray<_Tp>& __e1, const _Dom& __e2)
626 : _Base(__e1, __e2) {}
627 };
628
629 template<class _Oper, class _Dom>
630 struct _BinClos<_Oper, _Expr, _Constant, _Dom, typename _Dom::value_type>
631 : _BinBase2<_Oper, _Dom>
632 {
633 typedef typename _Dom::value_type _Tp;
634 typedef _BinBase2<_Oper,_Dom> _Base;
635 typedef typename _Base::value_type value_type;
636
637 _BinClos(const _Dom& __e1, const _Tp& __e2) : _Base(__e1, __e2) {}
638 };
639
640 template<class _Oper, class _Dom>
641 struct _BinClos<_Oper, _Constant, _Expr, typename _Dom::value_type, _Dom>
642 : _BinBase1<_Oper, _Dom>
643 {
644 typedef typename _Dom::value_type _Tp;
645 typedef _BinBase1<_Oper, _Dom> _Base;
646 typedef typename _Base::value_type value_type;
647
648 _BinClos(const _Tp& __e1, const _Dom& __e2) : _Base(__e1, __e2) {}
649 };
650
651 template<class _Oper, typename _Tp>
652 struct _BinClos<_Oper, _ValArray, _Constant, _Tp, _Tp>
653 : _BinBase2<_Oper, valarray<_Tp> >
654 {
655 typedef _BinBase2<_Oper,valarray<_Tp> > _Base;
656 typedef typename _Base::value_type value_type;
657
658 _BinClos(const valarray<_Tp>& __v, const _Tp& __t) : _Base(__v, __t) {}
659 };
660
661 template<class _Oper, typename _Tp>
662 struct _BinClos<_Oper, _Constant, _ValArray, _Tp, _Tp>
663 : _BinBase1<_Oper, valarray<_Tp> >
664 {
665 typedef _BinBase1<_Oper, valarray<_Tp> > _Base;
666 typedef typename _Base::value_type value_type;
667
668 _BinClos(const _Tp& __t, const valarray<_Tp>& __v) : _Base(__t, __v) {}
669 };
670
671 //
672 // slice_array closure.
673 //
674 template<typename _Dom>
675 class _SBase
676 {
677 public:
678 typedef typename _Dom::value_type value_type;
679
680 _SBase (const _Dom& __e, const slice& __s)
681 : _M_expr (__e), _M_slice (__s) {}
682
683 value_type
684 operator[] (size_t __i) const
685 { return _M_expr[_M_slice.start () + __i * _M_slice.stride ()]; }
686
687 size_t
688 size() const
689 { return _M_slice.size (); }
690
691 private:
692 const _Dom& _M_expr;
693 const slice& _M_slice;
694 };
695
696 template<typename _Tp>
697 class _SBase<_Array<_Tp> >
698 {
699 public:
700 typedef _Tp value_type;
701
702 _SBase (_Array<_Tp> __a, const slice& __s)
703 : _M_array (__a._M_data+__s.start()), _M_size (__s.size()),
704 _M_stride (__s.stride()) {}
705
706 value_type
707 operator[] (size_t __i) const
708 { return _M_array._M_data[__i * _M_stride]; }
709
710 size_t
711 size() const
712 { return _M_size; }
713
714 private:
715 const _Array<_Tp> _M_array;
716 const size_t _M_size;
717 const size_t _M_stride;
718 };
719
720 template<class _Dom>
721 struct _SClos<_Expr, _Dom>
722 : _SBase<_Dom>
723 {
724 typedef _SBase<_Dom> _Base;
725 typedef typename _Base::value_type value_type;
726
727 _SClos (const _Dom& __e, const slice& __s) : _Base (__e, __s) {}
728 };
729
730 template<typename _Tp>
731 struct _SClos<_ValArray, _Tp>
732 : _SBase<_Array<_Tp> >
733 {
734 typedef _SBase<_Array<_Tp> > _Base;
735 typedef _Tp value_type;
736
737 _SClos (_Array<_Tp> __a, const slice& __s) : _Base (__a, __s) {}
738 };
739
740_GLIBCXX_END_NAMESPACE_VERSION
741} // namespace
742
743#endif /* _CPP_VALARRAY_BEFORE_H */
744

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