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* [Bug c++/48617] New: [C++0x] Problem with non-type template parameters and decltype
@ 2011-04-15 9:04 daniel.kruegler at googlemail dot com
2011-05-22 19:22 ` [Bug c++/48617] " jason at gcc dot gnu.org
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: daniel.kruegler at googlemail dot com @ 2011-04-15 9:04 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48617
Summary: [C++0x] Problem with non-type template parameters and
decltype
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: daniel.kruegler@googlemail.com
gcc 4.7.0 in C++0x mode rejects the following program:
//---------------
template<class T, decltype(T())> // #
struct A {};
A<int, 0> a;
int main() {}
//---------------
The error message annotated at line # is:
"error: 'decltype (T())' is not a valid type for a template constant parameter"
It seems to me that according to the FDIS this should be well-formed program:
decltype is feasible as a /parameter-declaration/. The new type-equivalence
rules in [temp.type] p. 2,
"If an expression e involves a template parameter, decltype(e) denotes a unique
dependent type. Two such decltype-specifiers refer to the same type only if
their expressions are equivalent (14.5.6.1)."
should allow for a compiler to deduce the meaning similar to other dependent
contexts. See also [temp.dep.type] p. 8 for this matter:
"A type is dependent if it is [...] denoted by decltype(expression), where
expression is type-dependent (14.6.2.2)."
^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug c++/48617] [C++0x] Problem with non-type template parameters and decltype 2011-04-15 9:04 [Bug c++/48617] New: [C++0x] Problem with non-type template parameters and decltype daniel.kruegler at googlemail dot com @ 2011-05-22 19:22 ` jason at gcc dot gnu.org 2011-05-23 15:49 ` jason at gcc dot gnu.org ` (3 subsequent siblings) 4 siblings, 0 replies; 6+ messages in thread From: jason at gcc dot gnu.org @ 2011-05-22 19:22 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48617 Jason Merrill <jason at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |ASSIGNED Last reconfirmed| |2011.05.22 19:01:54 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] 6+ messages in thread
* [Bug c++/48617] [C++0x] Problem with non-type template parameters and decltype 2011-04-15 9:04 [Bug c++/48617] New: [C++0x] Problem with non-type template parameters and decltype daniel.kruegler at googlemail dot com 2011-05-22 19:22 ` [Bug c++/48617] " jason at gcc dot gnu.org @ 2011-05-23 15:49 ` jason at gcc dot gnu.org 2011-05-25 1:51 ` jason at gcc dot gnu.org ` (2 subsequent siblings) 4 siblings, 0 replies; 6+ messages in thread From: jason at gcc dot gnu.org @ 2011-05-23 15:49 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48617 --- Comment #1 from Jason Merrill <jason at gcc dot gnu.org> 2011-05-23 15:32:13 UTC --- Author: jason Date: Mon May 23 15:32:10 2011 New Revision: 174070 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=174070 Log: PR c++/48617 * pt.c (invalid_nontype_parm_type_p): Allow DECLTYPE_TYPE. Added: trunk/gcc/testsuite/g++.dg/cpp0x/decltype27.C Modified: trunk/gcc/cp/ChangeLog trunk/gcc/cp/pt.c trunk/gcc/testsuite/ChangeLog ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/48617] [C++0x] Problem with non-type template parameters and decltype 2011-04-15 9:04 [Bug c++/48617] New: [C++0x] Problem with non-type template parameters and decltype daniel.kruegler at googlemail dot com 2011-05-22 19:22 ` [Bug c++/48617] " jason at gcc dot gnu.org 2011-05-23 15:49 ` jason at gcc dot gnu.org @ 2011-05-25 1:51 ` jason at gcc dot gnu.org 2011-05-25 1:57 ` jason at gcc dot gnu.org 2011-06-18 19:16 ` jason at gcc dot gnu.org 4 siblings, 0 replies; 6+ messages in thread From: jason at gcc dot gnu.org @ 2011-05-25 1:51 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48617 --- Comment #2 from Jason Merrill <jason at gcc dot gnu.org> 2011-05-25 01:08:10 UTC --- Author: jason Date: Wed May 25 01:08:07 2011 New Revision: 174158 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=174158 Log: PR c++/48617 * pt.c (invalid_nontype_parm_type_p): Allow DECLTYPE_TYPE. Added: branches/gcc-4_6-branch/gcc/testsuite/g++.dg/cpp0x/decltype27.C Modified: branches/gcc-4_6-branch/gcc/cp/ChangeLog branches/gcc-4_6-branch/gcc/cp/pt.c branches/gcc-4_6-branch/gcc/testsuite/ChangeLog ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/48617] [C++0x] Problem with non-type template parameters and decltype 2011-04-15 9:04 [Bug c++/48617] New: [C++0x] Problem with non-type template parameters and decltype daniel.kruegler at googlemail dot com ` (2 preceding siblings ...) 2011-05-25 1:51 ` jason at gcc dot gnu.org @ 2011-05-25 1:57 ` jason at gcc dot gnu.org 2011-06-18 19:16 ` jason at gcc dot gnu.org 4 siblings, 0 replies; 6+ messages in thread From: jason at gcc dot gnu.org @ 2011-05-25 1:57 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48617 Jason Merrill <jason at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|ASSIGNED |RESOLVED Resolution| |FIXED Target Milestone|--- |4.6.1 --- Comment #3 from Jason Merrill <jason at gcc dot gnu.org> 2011-05-25 01:20:09 UTC --- Fixed for 4.6.1. ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/48617] [C++0x] Problem with non-type template parameters and decltype 2011-04-15 9:04 [Bug c++/48617] New: [C++0x] Problem with non-type template parameters and decltype daniel.kruegler at googlemail dot com ` (3 preceding siblings ...) 2011-05-25 1:57 ` jason at gcc dot gnu.org @ 2011-06-18 19:16 ` jason at gcc dot gnu.org 4 siblings, 0 replies; 6+ messages in thread From: jason at gcc dot gnu.org @ 2011-06-18 19:16 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48617 Jason Merrill <jason at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |jwakely.gcc at gmail dot | |com --- Comment #4 from Jason Merrill <jason at gcc dot gnu.org> 2011-06-18 19:15:09 UTC --- *** Bug 43646 has been marked as a duplicate of this bug. *** ^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2011-06-18 19:16 UTC | newest] Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2011-04-15 9:04 [Bug c++/48617] New: [C++0x] Problem with non-type template parameters and decltype daniel.kruegler at googlemail dot com 2011-05-22 19:22 ` [Bug c++/48617] " jason at gcc dot gnu.org 2011-05-23 15:49 ` jason at gcc dot gnu.org 2011-05-25 1:51 ` jason at gcc dot gnu.org 2011-05-25 1:57 ` jason at gcc dot gnu.org 2011-06-18 19:16 ` jason at gcc dot gnu.org
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