@@ -64,14 +64,23 @@ struct forward_iterator_tag : public input_iterator_tag {};
64 64
struct bidirectional_iterator_tag : public forward_iterator_tag {};
65 65
struct random_access_iterator_tag : public bidirectional_iterator_tag {};
66 66 67 +
// 27.4.3, iterator operations
67 68
// extension: second argument not conforming to C++03
68 -
template <class InputIterator>
69 -
void advance(InputIterator& i,
69 +
template <class InputIterator> // constexpr in C++17
70 +
constexpr void advance(InputIterator& i,
70 71
typename iterator_traits<InputIterator>::difference_type n);
71 72 72 -
template <class InputIterator>
73 -
typename iterator_traits<InputIterator>::difference_type
74 -
distance(InputIterator first, InputIterator last);
73 +
template <class InputIterator> // constexpr in C++17
74 +
constexpr typename iterator_traits<InputIterator>::difference_type
75 +
distance(InputIterator first, InputIterator last);
76 + 77 +
template <class InputIterator> // constexpr in C++17
78 +
constexpr InputIterator next(InputIterator x,
79 +
typename iterator_traits<InputIterator>::difference_type n = 1);
80 + 81 +
template <class BidirectionalIterator> // constexpr in C++17
82 +
constexpr BidirectionalIterator prev(BidirectionalIterator x,
83 +
typename iterator_traits<BidirectionalIterator>::difference_type n = 1);
75 84 76 85
template <class Iterator>
77 86
class reverse_iterator
@@ -529,7 +538,7 @@ struct _LIBCPP_TEMPLATE_VIS iterator
529 538
};
530 539 531 540
template <class _InputIter>
532 -
inline _LIBCPP_INLINE_VISIBILITY
541 +
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
533 542
void __advance(_InputIter& __i,
534 543
typename iterator_traits<_InputIter>::difference_type __n, input_iterator_tag)
535 544
{
@@ -538,7 +547,7 @@ void __advance(_InputIter& __i,
538 547
}
539 548 540 549
template <class _BiDirIter>
541 -
inline _LIBCPP_INLINE_VISIBILITY
550 +
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
542 551
void __advance(_BiDirIter& __i,
543 552
typename iterator_traits<_BiDirIter>::difference_type __n, bidirectional_iterator_tag)
544 553
{
@@ -551,23 +560,23 @@ void __advance(_BiDirIter& __i,
551 560
}
552 561 553 562
template <class _RandIter>
554 -
inline _LIBCPP_INLINE_VISIBILITY
563 +
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
555 564
void __advance(_RandIter& __i,
556 565
typename iterator_traits<_RandIter>::difference_type __n, random_access_iterator_tag)
557 566
{
558 567
__i += __n;
559 568
}
560 569 561 570
template <class _InputIter>
562 -
inline _LIBCPP_INLINE_VISIBILITY
571 +
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
563 572
void advance(_InputIter& __i,
564 573
typename iterator_traits<_InputIter>::difference_type __n)
565 574
{
566 575
__advance(__i, __n, typename iterator_traits<_InputIter>::iterator_category());
567 576
}
568 577 569 578
template <class _InputIter>
570 -
inline _LIBCPP_INLINE_VISIBILITY
579 +
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
571 580
typename iterator_traits<_InputIter>::difference_type
572 581
__distance(_InputIter __first, _InputIter __last, input_iterator_tag)
573 582
{
@@ -578,23 +587,23 @@ __distance(_InputIter __first, _InputIter __last, input_iterator_tag)
578 587
}
579 588 580 589
template <class _RandIter>
581 -
inline _LIBCPP_INLINE_VISIBILITY
590 +
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
582 591
typename iterator_traits<_RandIter>::difference_type
583 592
__distance(_RandIter __first, _RandIter __last, random_access_iterator_tag)
584 593
{
585 594
return __last - __first;
586 595
}
587 596 588 597
template <class _InputIter>
589 -
inline _LIBCPP_INLINE_VISIBILITY
598 +
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
590 599
typename iterator_traits<_InputIter>::difference_type
591 600
distance(_InputIter __first, _InputIter __last)
592 601
{
593 602
return __distance(__first, __last, typename iterator_traits<_InputIter>::iterator_category());
594 603
}
595 604 596 605
template <class _InputIter>
597 -
inline _LIBCPP_INLINE_VISIBILITY
606 +
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
598 607
_InputIter
599 608
next(_InputIter __x,
600 609
typename iterator_traits<_InputIter>::difference_type __n = 1,
@@ -605,7 +614,7 @@ next(_InputIter __x,
605 614
}
606 615 607 616
template <class _BidiretionalIter>
608 -
inline _LIBCPP_INLINE_VISIBILITY
617 +
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX14
609 618
_BidiretionalIter
610 619
prev(_BidiretionalIter __x,
611 620
typename iterator_traits<_BidiretionalIter>::difference_type __n = 1,
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