public inbox for libstdc++-cvs@sourceware.org
help / color / mirror / Atom feed
* [gcc r14-6200] libstdc++: Add workaround to std::ranges::subrange [PR111948]
@ 2023-12-05 23:35 Jonathan Wakely
0 siblings, 0 replies; only message in thread
From: Jonathan Wakely @ 2023-12-05 23:35 UTC (permalink / raw)
To: gcc-cvs, libstdc++-cvs
https://gcc.gnu.org/g:08448dc146b6dd32383d64ab491a594d41f62aaa
commit r14-6200-g08448dc146b6dd32383d64ab491a594d41f62aaa
Author: Jonathan Wakely <jwakely@redhat.com>
Date: Tue Oct 24 20:15:12 2023 +0100
libstdc++: Add workaround to std::ranges::subrange [PR111948]
libstdc++-v3/ChangeLog:
PR libstdc++/111948
* include/bits/ranges_util.h (subrange): Add constructor to
_Size to aoid setting member in constructor.
* testsuite/std/ranges/subrange/111948.cc: New test.
Diff:
---
libstdc++-v3/include/bits/ranges_util.h | 21 +++++++++++++--------
.../testsuite/std/ranges/subrange/111948.cc | 8 ++++++++
2 files changed, 21 insertions(+), 8 deletions(-)
diff --git a/libstdc++-v3/include/bits/ranges_util.h b/libstdc++-v3/include/bits/ranges_util.h
index ab6c69c57d0..185e46ec7a9 100644
--- a/libstdc++-v3/include/bits/ranges_util.h
+++ b/libstdc++-v3/include/bits/ranges_util.h
@@ -267,13 +267,21 @@ namespace ranges
using __size_type
= __detail::__make_unsigned_like_t<iter_difference_t<_It>>;
- template<typename, bool = _S_store_size>
+ template<typename _Tp, bool = _S_store_size>
struct _Size
- { };
+ {
+ [[__gnu__::__always_inline__]]
+ constexpr _Size(_Tp = {}) { }
+ };
template<typename _Tp>
struct _Size<_Tp, true>
- { _Tp _M_size; };
+ {
+ [[__gnu__::__always_inline__]]
+ constexpr _Size(_Tp __s = {}) : _M_size(__s) { }
+
+ _Tp _M_size;
+ };
[[no_unique_address]] _Size<__size_type> _M_size = {};
@@ -294,11 +302,8 @@ namespace ranges
noexcept(is_nothrow_constructible_v<_It, decltype(__i)>
&& is_nothrow_constructible_v<_Sent, _Sent&>)
requires (_Kind == subrange_kind::sized)
- : _M_begin(std::move(__i)), _M_end(__s)
- {
- if constexpr (_S_store_size)
- _M_size._M_size = __n;
- }
+ : _M_begin(std::move(__i)), _M_end(__s), _M_size(__n)
+ { }
template<__detail::__different_from<subrange> _Rng>
requires borrowed_range<_Rng>
diff --git a/libstdc++-v3/testsuite/std/ranges/subrange/111948.cc b/libstdc++-v3/testsuite/std/ranges/subrange/111948.cc
new file mode 100644
index 00000000000..dcc64b56def
--- /dev/null
+++ b/libstdc++-v3/testsuite/std/ranges/subrange/111948.cc
@@ -0,0 +1,8 @@
+// { dg-do compile { target c++20 } }
+
+#include <ranges>
+
+// Bug libstdc++/111948 - subrange modifies a const size object
+
+constexpr auto r = std::ranges::subrange(std::views::iota(0), 5);
+static_assert(std::ranges::distance(r));
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2023-12-05 23:35 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-12-05 23:35 [gcc r14-6200] libstdc++: Add workaround to std::ranges::subrange [PR111948] Jonathan Wakely
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).