* [committed] libstdc++: Fix access issue in elements_view::_Sentinel [PR100631]
@ 2021-05-18 14:23 Patrick Palka
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From: Patrick Palka @ 2021-05-18 14:23 UTC (permalink / raw)
To: gcc-patches; +Cc: libstdc++, Patrick Palka
In the earlier commit r12-854 I forgot to also rewrite the other operator-
overload in terms of the split-out member function _M_distance_from.
Tested on x86_64-pc-linux-gnu, committed as obvious.
libstdc++-v3/ChangeLog:
PR libstdc++/100631
* include/std/ranges (elements_view::_Sentinel::operator-): Use
_M_distance_from in the other operator- overload too.
* testsuite/std/ranges/adaptors/elements.cc (test06): Augment test.
---
libstdc++-v3/include/std/ranges | 2 +-
libstdc++-v3/testsuite/std/ranges/adaptors/elements.cc | 3 ++-
2 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/libstdc++-v3/include/std/ranges b/libstdc++-v3/include/std/ranges
index ca62f73ae5d..0588bebb351 100644
--- a/libstdc++-v3/include/std/ranges
+++ b/libstdc++-v3/include/std/ranges
@@ -3687,7 +3687,7 @@ namespace views::__adaptor
requires sized_sentinel_for<sentinel_t<_Base>, iterator_t<_Base2>>
friend constexpr range_difference_t<_Base2>
operator-(const _Iterator<_Const2>& __x, const _Sentinel& __y)
- { return __x._M_current - __y._M_end; }
+ { return -__y._M_distance_from(__x); }
template<bool _Const2,
typename _Base2 = __detail::__maybe_const_t<_Const2, _Vp>>
diff --git a/libstdc++-v3/testsuite/std/ranges/adaptors/elements.cc b/libstdc++-v3/testsuite/std/ranges/adaptors/elements.cc
index c6839e38ce5..1322f44036e 100644
--- a/libstdc++-v3/testsuite/std/ranges/adaptors/elements.cc
+++ b/libstdc++-v3/testsuite/std/ranges/adaptors/elements.cc
@@ -128,7 +128,8 @@ test06()
| views::keys;
auto b = r.begin();
auto e = r.end();
- e - b;
+ VERIFY( e - b == 42 );
+ VERIFY( b - e == -42 );
}
void
--
2.32.0.rc0
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2021-05-18 14:23 [committed] libstdc++: Fix access issue in elements_view::_Sentinel [PR100631] Patrick Palka
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