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libstdc++: Constrain std::as_writable_bytes [PR101411]

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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.
This commit is contained in:
Jonathan Wakely 2021-07-12 16:09:34 +01:00
parent 3f2338b470
commit 9d4393af9d
2 changed files with 16 additions and 0 deletions
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1
libstdc++-v3/include/std/span
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@ -425,6 +425,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
}
template<typename _Type, size_t _Extent>
requires (!is_const_v<_Type>)
inline
span<byte, _Extent == dynamic_extent
? dynamic_extent : _Extent * sizeof(_Type)>

15
libstdc++-v3/testsuite/23_containers/span/101411.cc Normal file
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@ -0,0 +1,15 @@
// { 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" }
}