As explained in one of Tomasz's library papers P2438R2[1], C++20 allows
ref-qualified member overloads to coexist with non-ref-qualified ones,
but at the time of writing no compiler supported that. This patch
implements this C++20 relaxation so that we can in turn implement
P2438R2 as originally intended -- without needing to change the
signature of the main string::substr overload.
[1]: https://wg21.link/P2438R2#_modifying_existing_const_overload
PR c++/98939
PR libstdc++/119745
gcc/cp/ChangeLog:
* class.cc (object_parms_correspond): Allow differing
FUNCTION_REF_QUALIFIED in C++20.
gcc/testsuite/ChangeLog:
* g++.dg/cpp0x/ref-qual5.C: Expect no diagnostics in C++20.
Reviewed-by: Jason Merrill <jason@redhat.com>
This directory contains the GNU Compiler Collection (GCC).
The GNU Compiler Collection is free software. See the files whose
names start with COPYING for copying permission. The manuals, and
some of the runtime libraries, are under different terms; see the
individual source files for details.
The directory INSTALL contains copies of the installation information
as HTML and plain text. The source of this information is
gcc/doc/install.texi. The installation information includes details
of what is included in the GCC sources and what files GCC installs.
See the file gcc/doc/gcc.texi (together with other files that it
includes) for usage and porting information. An online readable
version of the manual is in the files gcc/doc/gcc.info*.
See http://gcc.gnu.org/bugs/ for how to report bugs usefully.
Copyright years on GCC source files may be listed using range
notation, e.g., 1987-2012, indicating that every year in the range,
inclusive, is a copyrightable year that could otherwise be listed
individually.
ae37ade22e