[gcc r13-5079] libstdc++: Fix std::span constraint for sizeof(size_t) < sizeof(int) [PR108221]
Jonathan Wakely
redi@gcc.gnu.org
Tue Jan 10 10:10:04 GMT 2023
https://gcc.gnu.org/g:b39f4333d18cc58b1a655c537a78fefe95b82609
commit r13-5079-gb39f4333d18cc58b1a655c537a78fefe95b82609
Author: Jonathan Wakely <jwakely@redhat.com>
Date: Mon Jan 9 10:45:31 2023 +0000
libstdc++: Fix std::span constraint for sizeof(size_t) < sizeof(int) [PR108221]
The default constructor has a constraint that is always false if
arithmetic on size_t values promotes to int. Rewrite the constraint
exactly as written in the standard, which works correctly.
libstdc++-v3/ChangeLog:
PR libstdc++/108221
* include/std/span (span::span()): Un-simplify constraint to
work for size_t of lesser rank than int.
Diff:
---
libstdc++-v3/include/std/span | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libstdc++-v3/include/std/span b/libstdc++-v3/include/std/span
index 251fed91abf..b336332b190 100644
--- a/libstdc++-v3/include/std/span
+++ b/libstdc++-v3/include/std/span
@@ -145,7 +145,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
constexpr
span() noexcept
- requires ((_Extent + 1u) <= 1u)
+ requires (_Extent == dynamic_extent || _Extent == 0)
: _M_ptr(nullptr), _M_extent(0)
{ }
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