public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
* [Bug c++/48451] New: [C++0x][SFINAE] Failures with n-ary initialization expressions (with template default argument)
@ 2011-04-05 6:49 daniel.kruegler at googlemail dot com
2011-04-08 2:03 ` [Bug c++/48451] " jason at gcc dot gnu.org
2011-04-08 15:13 ` jason at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: daniel.kruegler at googlemail dot com @ 2011-04-05 6:49 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48451
Summary: [C++0x][SFINAE] Failures with n-ary initialization
expressions (with template default argument)
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: daniel.kruegler@googlemail.com
CC: jason@redhat.com
Some n-ary initialization expressions in a SFINAE context used in function
template default arguments either give a hard error:
a) any T => abstract class
or give the wrong result:
b) when the destination is a class type constructed from valid arguments
#include <utility> // for declval
template<class T, class... Args,
class = decltype(T(std::declval<Args>()...))
>
char f(int);
template<class, class...>
char (&f(...))[2];
struct A { virtual ~A() = 0; };
struct From2Ints { From2Ints(int, int); };
static_assert(sizeof(f<A, int, int>(0)) != 1, "Error"); // a
static_assert(sizeof(f<From2Ints, int, int>(0)) == 1, "Error"); // b
a) "error: cannot allocate an object of abstract type 'A' because the
following virtual functions are pure within 'A': virtual A::~A()"
b) Assertion triggers!
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/48451] [C++0x][SFINAE] Failures with n-ary initialization expressions (with template default argument)
2011-04-05 6:49 [Bug c++/48451] New: [C++0x][SFINAE] Failures with n-ary initialization expressions (with template default argument) daniel.kruegler at googlemail dot com
@ 2011-04-08 2:03 ` jason at gcc dot gnu.org
2011-04-08 15:13 ` jason at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: jason at gcc dot gnu.org @ 2011-04-08 2:03 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48451
--- Comment #1 from Jason Merrill <jason at gcc dot gnu.org> 2011-04-08 02:03:29 UTC ---
Author: jason
Date: Fri Apr 8 02:03:25 2011
New Revision: 172159
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=172159
Log:
PR c++/48451
* pt.c (fn_type_unification): Don't clear incomplete pack flag.
(type_unification_real): Clear it here instead.
Added:
trunk/gcc/testsuite/g++.dg/cpp0x/variadic107.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/pt.c
trunk/gcc/testsuite/ChangeLog
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/48451] [C++0x][SFINAE] Failures with n-ary initialization expressions (with template default argument)
2011-04-05 6:49 [Bug c++/48451] New: [C++0x][SFINAE] Failures with n-ary initialization expressions (with template default argument) daniel.kruegler at googlemail dot com
2011-04-08 2:03 ` [Bug c++/48451] " jason at gcc dot gnu.org
@ 2011-04-08 15:13 ` jason at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: jason at gcc dot gnu.org @ 2011-04-08 15:13 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48451
Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
CC| |jason at gcc dot gnu.org
Resolution| |FIXED
Target Milestone|--- |4.7.0
--- Comment #2 from Jason Merrill <jason at gcc dot gnu.org> 2011-04-08 15:13:13 UTC ---
Fixed.
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2011-04-08 15:13 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2011-04-05 6:49 [Bug c++/48451] New: [C++0x][SFINAE] Failures with n-ary initialization expressions (with template default argument) daniel.kruegler at googlemail dot com
2011-04-08 2:03 ` [Bug c++/48451] " jason at gcc dot gnu.org
2011-04-08 15:13 ` jason at gcc dot gnu.org
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).