The std::as_writable_bytes function should be constrained to only accept
writable spans. Currently it can be called but then gives an error in
the function body.
Signed-off-by: Jonathan Wakely <jwakely@redhat.com>
libstdc++-v3/ChangeLog:
PR libstdc++/101411
* include/std/span (as_writable_bytes): Add requires-clause.
* testsuite/23_containers/span/101411.cc: New test.
}
template<typename _Type, size_t _Extent>
+ requires (!is_const_v<_Type>)
inline
span<byte, _Extent == dynamic_extent
? dynamic_extent : _Extent * sizeof(_Type)>
--- /dev/null
+// { dg-options "-std=gnu++20" }
+// { dg-do compile { xfail c++20 } }
+#include <span>
+
+// PR libstdc++/101411
+
+void f(std::span<const int> s)
+{
+ std::as_writable_bytes(s); // { dg-error "no matching function" }
+}
+
+void f1(std::span<const int, 1> s)
+{
+ std::as_writable_bytes(s); // { dg-error "no matching function" }
+}