public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
* [Bug c++/54859] New: constexpr in template aliase rejected as non-constant
@ 2012-10-08 17:05 leonid at volnitsky dot com
2012-10-08 17:26 ` [Bug c++/54859] [4.8 Regression] " jakub at gcc dot gnu.org
` (5 more replies)
0 siblings, 6 replies; 7+ messages in thread
From: leonid at volnitsky dot com @ 2012-10-08 17:05 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54859
Bug #: 54859
Summary: constexpr in template aliase rejected as non-constant
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: leonid@volnitsky.com
clang-3.2 and gcc-4.7.2 compiles, gcc-4.8 rejects:
--------------------------------------------------------------------------
// enbale_if
template <bool B, class T = void>
struct enable_if { typedef T type; };
template <class T>
struct enable_if<false, T> {};
// template alias
template<bool Cnd, class T=void>
using eIF = typename enable_if <Cnd,T>::type;
// f - this compiles
template<bool B=true>
typename enable_if<!B, int>::type f() { return 20; }
// ff - error: integral expression ‘! B’ is not constant
template<bool B=true>
eIF<!B, int> ff() { return 20; }
int main() {}
---------------------------------------------------------------------------
This seams to be related to bug 54648, where I found bad commit to be 191412
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/54859] [4.8 Regression] constexpr in template aliase rejected as non-constant
2012-10-08 17:05 [Bug c++/54859] New: constexpr in template aliase rejected as non-constant leonid at volnitsky dot com
@ 2012-10-08 17:26 ` jakub at gcc dot gnu.org
2012-10-21 22:54 ` paolo.carlini at oracle dot com
` (4 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: jakub at gcc dot gnu.org @ 2012-10-08 17:26 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54859
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2012-10-08
CC| |jakub at gcc dot gnu.org
Target Milestone|--- |4.8.0
Summary|constexpr in template |[4.8 Regression] constexpr
|aliase rejected as |in template aliase rejected
|non-constant |as non-constant
Ever Confirmed|0 |1
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-10-08 17:25:42 UTC ---
Indeed, this started being rejected with
http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=191412 too.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/54859] [4.8 Regression] constexpr in template aliase rejected as non-constant
2012-10-08 17:05 [Bug c++/54859] New: constexpr in template aliase rejected as non-constant leonid at volnitsky dot com
2012-10-08 17:26 ` [Bug c++/54859] [4.8 Regression] " jakub at gcc dot gnu.org
@ 2012-10-21 22:54 ` paolo.carlini at oracle dot com
2012-11-08 15:08 ` [Bug c++/54859] [4.8 Regression] constexpr in template alias " redi at gcc dot gnu.org
` (3 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: paolo.carlini at oracle dot com @ 2012-10-21 22:54 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54859
Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |lucdanton at free dot fr
--- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> 2012-10-21 22:53:21 UTC ---
*** Bug 54912 has been marked as a duplicate of this bug. ***
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/54859] [4.8 Regression] constexpr in template alias rejected as non-constant
2012-10-08 17:05 [Bug c++/54859] New: constexpr in template aliase rejected as non-constant leonid at volnitsky dot com
2012-10-08 17:26 ` [Bug c++/54859] [4.8 Regression] " jakub at gcc dot gnu.org
2012-10-21 22:54 ` paolo.carlini at oracle dot com
@ 2012-11-08 15:08 ` redi at gcc dot gnu.org
2012-11-09 16:08 ` jason at gcc dot gnu.org
` (2 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: redi at gcc dot gnu.org @ 2012-11-08 15:08 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54859
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |rejects-valid
CC| |redi at gcc dot gnu.org
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-11-08 15:08:15 UTC ---
template<unsigned N>
using Num = int;
template<typename... Types>
using Count = Num<sizeof...(Types)>;
Count<int, char, void> i;
This claims sizeof is not a constant:
e.C:5:37: error: integral expression 'sizeof (Types ...)' is not constant
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/54859] [4.8 Regression] constexpr in template alias rejected as non-constant
2012-10-08 17:05 [Bug c++/54859] New: constexpr in template aliase rejected as non-constant leonid at volnitsky dot com
` (2 preceding siblings ...)
2012-11-08 15:08 ` [Bug c++/54859] [4.8 Regression] constexpr in template alias " redi at gcc dot gnu.org
@ 2012-11-09 16:08 ` jason at gcc dot gnu.org
2012-11-09 16:15 ` jason at gcc dot gnu.org
2012-11-09 18:24 ` paolo.carlini at oracle dot com
5 siblings, 0 replies; 7+ messages in thread
From: jason at gcc dot gnu.org @ 2012-11-09 16:08 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54859
Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
AssignedTo|unassigned at gcc dot |jason at gcc dot gnu.org
|gnu.org |
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/54859] [4.8 Regression] constexpr in template alias rejected as non-constant
2012-10-08 17:05 [Bug c++/54859] New: constexpr in template aliase rejected as non-constant leonid at volnitsky dot com
` (3 preceding siblings ...)
2012-11-09 16:08 ` jason at gcc dot gnu.org
@ 2012-11-09 16:15 ` jason at gcc dot gnu.org
2012-11-09 18:24 ` paolo.carlini at oracle dot com
5 siblings, 0 replies; 7+ messages in thread
From: jason at gcc dot gnu.org @ 2012-11-09 16:15 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54859
--- Comment #4 from Jason Merrill <jason at gcc dot gnu.org> 2012-11-09 16:14:56 UTC ---
Author: jason
Date: Fri Nov 9 16:14:48 2012
New Revision: 193368
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=193368
Log:
PR c++/54859
* pt.c (check_instantiated_arg): Don't complain about dependent args.
Added:
trunk/gcc/testsuite/g++.dg/cpp0x/alias-decl-25.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/pt.c
trunk/gcc/testsuite/ChangeLog
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/54859] [4.8 Regression] constexpr in template alias rejected as non-constant
2012-10-08 17:05 [Bug c++/54859] New: constexpr in template aliase rejected as non-constant leonid at volnitsky dot com
` (4 preceding siblings ...)
2012-11-09 16:15 ` jason at gcc dot gnu.org
@ 2012-11-09 18:24 ` paolo.carlini at oracle dot com
5 siblings, 0 replies; 7+ messages in thread
From: paolo.carlini at oracle dot com @ 2012-11-09 18:24 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54859
Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
CC|jason at gcc dot gnu.org |
Resolution| |FIXED
--- Comment #5 from Paolo Carlini <paolo.carlini at oracle dot com> 2012-11-09 18:23:57 UTC ---
This is fixed then.
^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2012-11-09 18:24 UTC | newest]
Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2012-10-08 17:05 [Bug c++/54859] New: constexpr in template aliase rejected as non-constant leonid at volnitsky dot com
2012-10-08 17:26 ` [Bug c++/54859] [4.8 Regression] " jakub at gcc dot gnu.org
2012-10-21 22:54 ` paolo.carlini at oracle dot com
2012-11-08 15:08 ` [Bug c++/54859] [4.8 Regression] constexpr in template alias " redi at gcc dot gnu.org
2012-11-09 16:08 ` jason at gcc dot gnu.org
2012-11-09 16:15 ` jason at gcc dot gnu.org
2012-11-09 18:24 ` paolo.carlini at oracle dot com
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).