https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115335
Bug ID: 115335
Summary: std::span at method is missing feature test macro
__cpp_lib_span >= 202311L
Product: gcc
Version: 14.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: gcc at ebasoft dot com.pl
Target Milestone: ---
gcc (Gentoo 14.1.1_p20240518 p1) 14.1.1 20240516
In gcc stdlibc++ 14 there is method span<>::at added that should be visible
only to standard c++26.
https://en.cppreference.com/w/cpp/container/span/at
But implementation is missing feature test macro
__cpp_lib_span >= 202311L and this method is visible for all standards backward
in c++20 and c++23.
availability in backward standards makes difficult to refactor code for example
from vector to span that will be still portable with older gcc like 13 when it
is being done on platform with gcc libstdc++ 14 as there is no compiler error
when method at is being used after refactoring vector to span.
