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* [Bug c++/50830] New: [c++0x] Variadic template, inner class error
@ 2011-10-22 14:46 trashyankes at wp dot pl
2011-10-22 20:37 ` [Bug c++/50830] " redi at gcc dot gnu.org
` (11 more replies)
0 siblings, 12 replies; 13+ messages in thread
From: trashyankes at wp dot pl @ 2011-10-22 14:46 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50830
Bug #: 50830
Summary: [c++0x] Variadic template, inner class error
Classification: Unclassified
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: trashyankes@wp.pl
Build: MinGW 4.6.0 20110210; MinGW 4.7.0 20110815
this code generate error `expected a class template, got 'template<class>
struct aa'` (case `a4` and `a5`)
when i remove every `...` its compile without problems
-----------------------------------------------------
template<class...>
struct list_type {};
template<template<class> class...>
struct list_templates {};
template<class>
struct aa {};
template<class>
struct bb {};
template<class... T>
struct test {};
template<template<class> class... F>
struct test<list_templates<F...>>
{
struct inner {};
};
template<template<class> class... F, template<class> class... F2>
struct test<list_templates<F...>, list_templates<F2...>>
{
struct inner {};
};
template<class... T>
struct test<list_type<T...>>
{
struct inner {};
};
template<class... T,class... T2>
struct test<list_type<T...>, list_type<T2...>>
{
struct inner {};
};
template<template<class> class... F, class... T>
struct test<list_templates<F...>, list_type<T...>>
{
struct inner {};
};
test<list_templates<aa>> a1;
test<list_type<int>> a2;
test<list_type<int>, list_type<int>> a3;
test<list_templates<aa>, list_type<int>> a4; // error
test<list_templates<aa>, list_templates<bb>> a5; // error
-----------------------------------------------------
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug c++/50830] [c++0x] Variadic template, inner class error
2011-10-22 14:46 [Bug c++/50830] New: [c++0x] Variadic template, inner class error trashyankes at wp dot pl
@ 2011-10-22 20:37 ` redi at gcc dot gnu.org
2011-10-22 20:57 ` redi at gcc dot gnu.org
` (10 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: redi at gcc dot gnu.org @ 2011-10-22 20:37 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50830
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-10-22 20:37:03 UTC ---
reduced:
template<template<class> class...>
struct list_templates {};
template<class>
struct aa {};
template<class... T>
struct test {};
template<template<class> class... F, class T>
struct test<list_templates<F...>, T>
{
struct inner {};
};
test<list_templates<aa>, int> a4; // error
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug c++/50830] [c++0x] Variadic template, inner class error
2011-10-22 14:46 [Bug c++/50830] New: [c++0x] Variadic template, inner class error trashyankes at wp dot pl
2011-10-22 20:37 ` [Bug c++/50830] " redi at gcc dot gnu.org
@ 2011-10-22 20:57 ` redi at gcc dot gnu.org
2011-10-22 21:07 ` redi at gcc dot gnu.org
` (9 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: redi at gcc dot gnu.org @ 2011-10-22 20:57 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50830
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-10-22 20:57:04 UTC ---
The reduced example compiles if the partial specialization is declared so the
pack expansion is last:
template<class T, template<class> class... F>
struct test<list_templates<F...>, T>
{
struct inner {};
};
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug c++/50830] [c++0x] Variadic template, inner class error
2011-10-22 14:46 [Bug c++/50830] New: [c++0x] Variadic template, inner class error trashyankes at wp dot pl
2011-10-22 20:37 ` [Bug c++/50830] " redi at gcc dot gnu.org
2011-10-22 20:57 ` redi at gcc dot gnu.org
@ 2011-10-22 21:07 ` redi at gcc dot gnu.org
2011-10-22 21:15 ` daniel.kruegler at googlemail dot com
` (8 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: redi at gcc dot gnu.org @ 2011-10-22 21:07 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50830
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-10-22 21:07:31 UTC ---
(In reply to comment #0)
> when i remove every `...` its compile without problems
N.B. that doesn't mean this is a G++ bug
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug c++/50830] [c++0x] Variadic template, inner class error
2011-10-22 14:46 [Bug c++/50830] New: [c++0x] Variadic template, inner class error trashyankes at wp dot pl
` (2 preceding siblings ...)
2011-10-22 21:07 ` redi at gcc dot gnu.org
@ 2011-10-22 21:15 ` daniel.kruegler at googlemail dot com
2011-10-22 22:02 ` redi at gcc dot gnu.org
` (7 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: daniel.kruegler at googlemail dot com @ 2011-10-22 21:15 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50830
--- Comment #4 from Daniel Krügler <daniel.kruegler at googlemail dot com> 2011-10-22 21:15:20 UTC ---
(In reply to comment #3)
I agree, but the partial specialization
template<template<class> class... F, class T>
struct test<list_templates<F...>, T>;
should be fine, because only primary class templates require a template
parameter pack to be the last parameter (14.1 p11).
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug c++/50830] [c++0x] Variadic template, inner class error
2011-10-22 14:46 [Bug c++/50830] New: [c++0x] Variadic template, inner class error trashyankes at wp dot pl
` (3 preceding siblings ...)
2011-10-22 21:15 ` daniel.kruegler at googlemail dot com
@ 2011-10-22 22:02 ` redi at gcc dot gnu.org
2011-10-23 9:52 ` daniel.kruegler at googlemail dot com
` (6 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: redi at gcc dot gnu.org @ 2011-10-22 22:02 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50830
--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-10-22 22:02:30 UTC ---
does the last sentence of [temp.class.spec] apply here?
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug c++/50830] [c++0x] Variadic template, inner class error
2011-10-22 14:46 [Bug c++/50830] New: [c++0x] Variadic template, inner class error trashyankes at wp dot pl
` (4 preceding siblings ...)
2011-10-22 22:02 ` redi at gcc dot gnu.org
@ 2011-10-23 9:52 ` daniel.kruegler at googlemail dot com
2011-10-23 10:02 ` daniel.kruegler at googlemail dot com
` (5 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: daniel.kruegler at googlemail dot com @ 2011-10-23 9:52 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50830
--- Comment #6 from Daniel Krügler <daniel.kruegler at googlemail dot com> 2011-10-23 09:51:44 UTC ---
[I assume you refer to p8 and the sentence: "If an argument is a pack expansion
(14.5.3), it shall be the last argument in the template argument list."]
No. list_templates<F...> is not an argument that *is* a pack expansion (but it
contains a pack expansion, which is fine). This sentence describes a situation
like the following:
template<class>
struct P;
template<class...>
struct X;
template<class... Ts, class T>
struct X<Ts..., P<T>> {};
This is ill-formed because the expansion Ts... is not at the end of the
argument list.
Changing it to
template<class... Ts, class T>
struct X<P<T>, Ts...> {};
would be OK, though.
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug c++/50830] [c++0x] Variadic template, inner class error
2011-10-22 14:46 [Bug c++/50830] New: [c++0x] Variadic template, inner class error trashyankes at wp dot pl
` (5 preceding siblings ...)
2011-10-23 9:52 ` daniel.kruegler at googlemail dot com
@ 2011-10-23 10:02 ` daniel.kruegler at googlemail dot com
2011-10-23 11:29 ` paolo.carlini at oracle dot com
` (4 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: daniel.kruegler at googlemail dot com @ 2011-10-23 10:02 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50830
--- Comment #7 from Daniel Krügler <daniel.kruegler at googlemail dot com> 2011-10-23 10:02:19 UTC ---
I can only guess that there is a compiler defect in regard to handling variadic
template template parameters. The corresponding example
template<class...>
struct S;
template<class...>
struct X;
template<class... Ts, class T>
struct X<S<Ts...>, T> {};
X<S<int, bool>, double> x;
is accepted as expected.
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug c++/50830] [c++0x] Variadic template, inner class error
2011-10-22 14:46 [Bug c++/50830] New: [c++0x] Variadic template, inner class error trashyankes at wp dot pl
` (6 preceding siblings ...)
2011-10-23 10:02 ` daniel.kruegler at googlemail dot com
@ 2011-10-23 11:29 ` paolo.carlini at oracle dot com
2012-04-16 15:53 ` jason at gcc dot gnu.org
` (3 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: paolo.carlini at oracle dot com @ 2011-10-23 11:29 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50830
Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |paolo.carlini at oracle dot
| |com
--- Comment #8 from Paolo Carlini <paolo.carlini at oracle dot com> 2011-10-23 11:28:47 UTC ---
Note: about variadic template template we also have PR50303.
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug c++/50830] [c++0x] Variadic template, inner class error
2011-10-22 14:46 [Bug c++/50830] New: [c++0x] Variadic template, inner class error trashyankes at wp dot pl
` (7 preceding siblings ...)
2011-10-23 11:29 ` paolo.carlini at oracle dot com
@ 2012-04-16 15:53 ` jason at gcc dot gnu.org
2012-04-17 2:38 ` jason at gcc dot gnu.org
` (2 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: jason at gcc dot gnu.org @ 2012-04-16 15:53 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50830
Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2012-04-16
CC| |jason at gcc dot gnu.org
AssignedTo|unassigned at gcc dot |jason at gcc dot gnu.org
|gnu.org |
Ever Confirmed|0 |1
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug c++/50830] [c++0x] Variadic template, inner class error
2011-10-22 14:46 [Bug c++/50830] New: [c++0x] Variadic template, inner class error trashyankes at wp dot pl
` (8 preceding siblings ...)
2012-04-16 15:53 ` jason at gcc dot gnu.org
@ 2012-04-17 2:38 ` jason at gcc dot gnu.org
2012-04-17 14:16 ` jason at gcc dot gnu.org
2012-04-17 15:46 ` jason at gcc dot gnu.org
11 siblings, 0 replies; 13+ messages in thread
From: jason at gcc dot gnu.org @ 2012-04-17 2:38 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50830
--- Comment #9 from Jason Merrill <jason at gcc dot gnu.org> 2012-04-17 02:29:40 UTC ---
Author: jason
Date: Tue Apr 17 02:29:35 2012
New Revision: 186520
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=186520
Log:
PR c++/50830
* pt.c (convert_template_argument): Handle template template
argument packs.
Added:
trunk/gcc/testsuite/g++.dg/cpp0x/variadic129.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/pt.c
trunk/gcc/testsuite/ChangeLog
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug c++/50830] [c++0x] Variadic template, inner class error
2011-10-22 14:46 [Bug c++/50830] New: [c++0x] Variadic template, inner class error trashyankes at wp dot pl
` (9 preceding siblings ...)
2012-04-17 2:38 ` jason at gcc dot gnu.org
@ 2012-04-17 14:16 ` jason at gcc dot gnu.org
2012-04-17 15:46 ` jason at gcc dot gnu.org
11 siblings, 0 replies; 13+ messages in thread
From: jason at gcc dot gnu.org @ 2012-04-17 14:16 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50830
--- Comment #10 from Jason Merrill <jason at gcc dot gnu.org> 2012-04-17 14:11:24 UTC ---
Author: jason
Date: Tue Apr 17 14:11:13 2012
New Revision: 186532
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=186532
Log:
PR c++/50830
* pt.c (convert_template_argument): Handle template template
argument packs.
Added:
branches/gcc-4_7-branch/gcc/testsuite/g++.dg/cpp0x/variadic129.C
Modified:
branches/gcc-4_7-branch/gcc/cp/ChangeLog
branches/gcc-4_7-branch/gcc/cp/pt.c
branches/gcc-4_7-branch/gcc/testsuite/ChangeLog
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug c++/50830] [c++0x] Variadic template, inner class error
2011-10-22 14:46 [Bug c++/50830] New: [c++0x] Variadic template, inner class error trashyankes at wp dot pl
` (10 preceding siblings ...)
2012-04-17 14:16 ` jason at gcc dot gnu.org
@ 2012-04-17 15:46 ` jason at gcc dot gnu.org
11 siblings, 0 replies; 13+ messages in thread
From: jason at gcc dot gnu.org @ 2012-04-17 15:46 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50830
Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution| |FIXED
Target Milestone|--- |4.7.1
--- Comment #11 from Jason Merrill <jason at gcc dot gnu.org> 2012-04-17 15:27:53 UTC ---
Fixed for 4.7.1.
^ permalink raw reply [flat|nested] 13+ messages in thread
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2011-10-22 14:46 [Bug c++/50830] New: [c++0x] Variadic template, inner class error trashyankes at wp dot pl
2011-10-22 20:37 ` [Bug c++/50830] " redi at gcc dot gnu.org
2011-10-22 20:57 ` redi at gcc dot gnu.org
2011-10-22 21:07 ` redi at gcc dot gnu.org
2011-10-22 21:15 ` daniel.kruegler at googlemail dot com
2011-10-22 22:02 ` redi at gcc dot gnu.org
2011-10-23 9:52 ` daniel.kruegler at googlemail dot com
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2011-10-23 11:29 ` paolo.carlini at oracle dot com
2012-04-16 15:53 ` jason at gcc dot gnu.org
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