* [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
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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
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* [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
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2011-10-22 21:07 ` redi at gcc dot gnu.org
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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 {};
};
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* [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
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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
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* [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
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2011-10-22 21:07 ` redi at gcc dot gnu.org
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From: daniel.kruegler at googlemail dot com @ 2011-10-22 21:15 UTC (permalink / raw)
To: gcc-bugs
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--- 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).
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* [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
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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?
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* [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
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From: daniel.kruegler at googlemail dot com @ 2011-10-23 9:52 UTC (permalink / raw)
To: gcc-bugs
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--- 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.
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* [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
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2011-10-23 11:29 ` paolo.carlini at oracle dot com
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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.
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* [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
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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.
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* [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
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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
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* [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
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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
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* [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
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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
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* [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
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2012-04-17 14:16 ` jason at gcc dot gnu.org
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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.
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