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* [Bug c++/62274] New: [C++11] Variadic templates expansion into non-variadic class template
@ 2014-08-26 23:03 juchem at gmail dot com
2014-12-14 0:04 ` [Bug c++/62274] " ville.voutilainen at gmail dot com
` (5 more replies)
0 siblings, 6 replies; 7+ messages in thread
From: juchem at gmail dot com @ 2014-08-26 23:03 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62274
Bug ID: 62274
Summary: [C++11] Variadic templates expansion into non-variadic
class template
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: juchem at gmail dot com
The code below won't compile for gcc 4.9.0, 4.8.1 and 4.7.3. Tested in Debian
sid (aug/2014), http://gcc.godbolt.org/ and http://ideone.com.
#include <type_traits>
using namespace std;
struct bar { typedef double foo; };
template <typename T>
using get_foo = typename T::foo;
template <template <typename...> class T>
struct baz {
template <typename... UArgs>
using type = T<UArgs...>;
};
int main() {
return !std::is_same<double, baz<get_foo>::type<bar>>::value;
}
error output:
prog.cpp: In substitution of ‘template<class T> using get_foo = typename T::foo
[with T = UArgs ...]’:
prog.cpp:13:26: required from ‘struct baz<get_foo>’
prog.cpp:17:49: required from here
prog.cpp:8:32: error: ‘UArgs ...’ is not a class, struct, or union type
using get_foo = typename T::foo;
^
prog.cpp: In function ‘int main()’:
prog.cpp:17:59: error: template argument 2 is invalid
static_assert(std::is_same<double, baz<get_foo>::type<bar>>::value,
"mismatch");
>From gcc-bugs-return-459316-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Aug 26 23:07:34 2014
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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/62262] aarch64 gcc generates invalid assembler
Date: Tue, 26 Aug 2014 23:07:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idb262
--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Carrot from comment #5)
> Actually the original source code is guarded by assert, and the parameter
> passed to CLZ can be guaranteed not 0, so "value <<= zeros" is well defined
> in our original source code.
The issue is the second CLZ (not the first one). Though if I read the code
correctly value<<1 can never be zero but GCC does not optimize away that check.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/62274] [C++11] Variadic templates expansion into non-variadic class template
2014-08-26 23:03 [Bug c++/62274] New: [C++11] Variadic templates expansion into non-variadic class template juchem at gmail dot com
@ 2014-12-14 0:04 ` ville.voutilainen at gmail dot com
2015-03-05 7:26 ` juchem at gmail dot com
` (4 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: ville.voutilainen at gmail dot com @ 2014-12-14 0:04 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62274
Ville Voutilainen <ville.voutilainen at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |ville.voutilainen at gmail dot com
--- Comment #2 from Ville Voutilainen <ville.voutilainen at gmail dot com> ---
Clang doesn't accept the code either. The technique looks reasonable, the
validity of this should probably be queried from CWG.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/62274] [C++11] Variadic templates expansion into non-variadic class template
2014-08-26 23:03 [Bug c++/62274] New: [C++11] Variadic templates expansion into non-variadic class template juchem at gmail dot com
2014-12-14 0:04 ` [Bug c++/62274] " ville.voutilainen at gmail dot com
@ 2015-03-05 7:26 ` juchem at gmail dot com
2015-03-05 7:50 ` ville.voutilainen at gmail dot com
` (3 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: juchem at gmail dot com @ 2015-03-05 7:26 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62274
--- Comment #3 from juchem at gmail dot com ---
Clang does accept this code: http://goo.gl/YKBt2l
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/62274] [C++11] Variadic templates expansion into non-variadic class template
2014-08-26 23:03 [Bug c++/62274] New: [C++11] Variadic templates expansion into non-variadic class template juchem at gmail dot com
2014-12-14 0:04 ` [Bug c++/62274] " ville.voutilainen at gmail dot com
2015-03-05 7:26 ` juchem at gmail dot com
@ 2015-03-05 7:50 ` ville.voutilainen at gmail dot com
2015-03-05 10:48 ` redi at gcc dot gnu.org
` (2 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: ville.voutilainen at gmail dot com @ 2015-03-05 7:50 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62274
--- Comment #4 from Ville Voutilainen <ville.voutilainen at gmail dot com> ---
(In reply to juchem from comment #3)
> Clang does accept this code: http://goo.gl/YKBt2l
Clang 3.3 and 3.4 do, yes. 3.5, 3.6 and their trunk don't.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/62274] [C++11] Variadic templates expansion into non-variadic class template
2014-08-26 23:03 [Bug c++/62274] New: [C++11] Variadic templates expansion into non-variadic class template juchem at gmail dot com
` (2 preceding siblings ...)
2015-03-05 7:50 ` ville.voutilainen at gmail dot com
@ 2015-03-05 10:48 ` redi at gcc dot gnu.org
2021-08-02 2:21 ` pinskia at gcc dot gnu.org
2021-08-02 3:59 ` ville.voutilainen at gmail dot com
5 siblings, 0 replies; 7+ messages in thread
From: redi at gcc dot gnu.org @ 2015-03-05 10:48 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62274
--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
EDG accepts it.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/62274] [C++11] Variadic templates expansion into non-variadic class template
2014-08-26 23:03 [Bug c++/62274] New: [C++11] Variadic templates expansion into non-variadic class template juchem at gmail dot com
` (3 preceding siblings ...)
2015-03-05 10:48 ` redi at gcc dot gnu.org
@ 2021-08-02 2:21 ` pinskia at gcc dot gnu.org
2021-08-02 3:59 ` ville.voutilainen at gmail dot com
5 siblings, 0 replies; 7+ messages in thread
From: pinskia at gcc dot gnu.org @ 2021-08-02 2:21 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62274
--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
GCC, clang and MSVC all reject it with a similar error message.
ICC accepts it.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/62274] [C++11] Variadic templates expansion into non-variadic class template
2014-08-26 23:03 [Bug c++/62274] New: [C++11] Variadic templates expansion into non-variadic class template juchem at gmail dot com
` (4 preceding siblings ...)
2021-08-02 2:21 ` pinskia at gcc dot gnu.org
@ 2021-08-02 3:59 ` ville.voutilainen at gmail dot com
5 siblings, 0 replies; 7+ messages in thread
From: ville.voutilainen at gmail dot com @ 2021-08-02 3:59 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62274
Ville Voutilainen <ville.voutilainen at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jason at redhat dot com
--- Comment #7 from Ville Voutilainen <ville.voutilainen at gmail dot com> ---
I think this may be subject to various Core discussions. Jason?
^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2021-08-02 3:59 UTC | newest]
Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
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2014-08-26 23:03 [Bug c++/62274] New: [C++11] Variadic templates expansion into non-variadic class template juchem at gmail dot com
2014-12-14 0:04 ` [Bug c++/62274] " ville.voutilainen at gmail dot com
2015-03-05 7:26 ` juchem at gmail dot com
2015-03-05 7:50 ` ville.voutilainen at gmail dot com
2015-03-05 10:48 ` redi at gcc dot gnu.org
2021-08-02 2:21 ` pinskia at gcc dot gnu.org
2021-08-02 3:59 ` ville.voutilainen at gmail dot com
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