https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95609
Bug ID: 95609
Summary: span<T> could have better layout
Product: gcc
Version: 10.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: s_gccbugzilla at nedprod dot com
Target Milestone: ---
I would assume that the ABI ship has sailed, as usual, but if libstdc++'s
span<T> could instead have the layout:
{
T *p;
size_t l;
}
... then a span<byte> would be layout-compatible with struct iovec, which would
save libstdc++ having to reimplement span<> with a struct iovec compatible
layout for any future std::file_handle::buffer_type, if that gets standardised.
I put notice of this out onto lib-ext last year requesting this of span<T>
implementations. libc++ heeded my request, MSVC have very kindly undone their
initial implementation to meet the pointer + size layout plus add standard
layout, so they'll be on that too going forth.
In the end, this request is about as unimportant for right now as you can get.
It's purely for saving you, Jonathan, avoidable work later on.
Niall
