* [Bug c++/49045] [C++0x] unexpected "different exception specifier" error with noexcept
2011-05-18 15:58 [Bug c++/49045] New: [C++0x] unexpected "different exception specifier" error with noexcept paolo.carlini at oracle dot com
@ 2011-05-18 15:35 ` paolo.carlini at oracle dot com
2011-05-18 18:23 ` jason at gcc dot gnu.org
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From: paolo.carlini at oracle dot com @ 2011-05-18 15:35 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49045
Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jason at gcc dot gnu.org
--- Comment #1 from Paolo Carlini <paolo.carlini at oracle dot com> 2011-05-18 15:18:13 UTC ---
Asking Jason' help
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2011-05-18 15:35 ` [Bug c++/49045] " paolo.carlini at oracle dot com
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From: jason at gcc dot gnu.org @ 2011-05-18 18:23 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49045
--- Comment #2 from Jason Merrill <jason at gcc dot gnu.org> 2011-05-18 18:03:17 UTC ---
Hmm, that's tricky. G++ is saying that the two exception-specifications are
different because the unqualified lookups for swap differ, because the latter
one also finds the middle declaration. This seems like a core issue.
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From: paolo.carlini at oracle dot com @ 2011-05-18 18:25 UTC (permalink / raw)
To: gcc-bugs
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--- Comment #3 from Paolo Carlini <paolo.carlini at oracle dot com> 2011-05-18 18:12:46 UTC ---
Eh, interesting indeed.
By the way, can you imagine a possible workaround for implementing in the
library the swap overload for arrays while also declaring it?
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From: jason at gcc dot gnu.org @ 2011-05-18 18:42 UTC (permalink / raw)
To: gcc-bugs
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--- Comment #4 from Jason Merrill <jason at gcc dot gnu.org> 2011-05-18 18:21:39 UTC ---
A workaround would be to use a forwarding function:
template<typename _Tp>
void
swap(_Tp&, _Tp&);
template<class T>
void __do_swap(T&& a,T&& b) { swap(a,b); }
template<typename _Tp, __SIZE_TYPE__ _Nm>
void
swap(_Tp (&__a)[_Nm], _Tp (&__b)[_Nm])
noexcept(noexcept(__do_swap(*__a, *__b)));
template<typename _Tp, __SIZE_TYPE__ _Nm>
void
swap(_Tp (&__a)[_Nm], _Tp (&__b)[_Nm])
noexcept(noexcept(__do_swap(*__a, *__b)))
{ }
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From: jason at gcc dot gnu.org @ 2011-05-18 18:47 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49045
--- Comment #5 from Jason Merrill <jason at gcc dot gnu.org> 2011-05-18 18:24:31 UTC ---
Or, rather:
template<typename _Tp>
void
swap(_Tp&, _Tp&);
template<class T> void __swap_dummy(T&& a,T&& b)
noexcept(noexcept(swap(a,b)));
template<typename _Tp, __SIZE_TYPE__ _Nm>
void
swap(_Tp (&__a)[_Nm], _Tp (&__b)[_Nm])
noexcept(noexcept(__swap_dummy(*__a, *__b)));
template<typename _Tp, __SIZE_TYPE__ _Nm>
void
swap(_Tp (&__a)[_Nm], _Tp (&__b)[_Nm])
noexcept(noexcept(__swap_dummy(*__a, *__b)))
{ swap(*__a,*__b); }
-----
__swap_dummy doesn't actually need a body, but it does need a
noexcept-specifier.
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From: daniel.kruegler at googlemail dot com @ 2011-05-18 18:52 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49045
Daniel Krügler <daniel.kruegler at googlemail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |daniel.kruegler at
| |googlemail dot com
--- Comment #6 from Daniel Krügler <daniel.kruegler at googlemail dot com> 2011-05-18 18:35:09 UTC ---
(In reply to comment #3)
I found a similar approach to Jason based on a helper trait:
template<typename _Tp>
void
swap(_Tp&, _Tp&);
template<typename _Tp>
struct __is_nothrow_swappable {
static const bool value = noexcept(swap(std::declval<_Tp&>(),
std::declval<_Tp&>()));
};
template<typename _Tp, __SIZE_TYPE__ _Nm>
void
swap(_Tp (&__a)[_Nm], _Tp (&__b)[_Nm])
noexcept(__is_nothrow_swappable<_Tp>::value);
template<typename _Tp, __SIZE_TYPE__ _Nm>
void
swap(_Tp (&__a)[_Nm], _Tp (&__b)[_Nm])
noexcept(__is_nothrow_swappable<_Tp>::value)
{ }
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From: paolo.carlini at oracle dot com @ 2011-05-18 19:55 UTC (permalink / raw)
To: gcc-bugs
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--- Comment #7 from Paolo Carlini <paolo.carlini at oracle dot com> 2011-05-18 18:40:35 UTC ---
Ok guys. Thanks a lot for the suggestions, indeed should figured out both
myself, eh! ;)
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From: jason at gcc dot gnu.org @ 2011-05-20 23:05 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49045
Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |SUSPENDED
Last reconfirmed| |2011.05.20 22:07:43
Ever Confirmed|0 |1
--- Comment #8 from Jason Merrill <jason at gcc dot gnu.org> 2011-05-20 22:07:43 UTC ---
Suspending for core resolution.
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From: jason at gcc dot gnu.org @ 2011-08-23 15:54 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49045
Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|SUSPENDED |ASSIGNED
AssignedTo|unassigned at gcc dot |jason at gcc dot gnu.org
|gnu.org |
Target Milestone|--- |4.7.0
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From: jason at gcc dot gnu.org @ 2011-08-23 16:32 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49045
--- Comment #9 from Jason Merrill <jason at gcc dot gnu.org> 2011-08-23 16:03:56 UTC ---
Author: jason
Date: Tue Aug 23 16:03:44 2011
New Revision: 177998
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=177998
Log:
PR c++/49045
Core 1321
* tree.c (dependent_name): New.
(cp_tree_equal): Two calls with the same dependent name are
equivalent even if the overload sets are different.
Added:
trunk/gcc/testsuite/g++.dg/cpp0x/overload2.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/tree.c
trunk/gcc/testsuite/ChangeLog
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From: paolo.carlini at oracle dot com @ 2011-08-23 16:42 UTC (permalink / raw)
To: gcc-bugs
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--- Comment #10 from Paolo Carlini <paolo.carlini at oracle dot com> 2011-08-23 16:40:01 UTC ---
Great. I'll soon remove the wa and adjust the library.
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From: jason at gcc dot gnu.org @ 2011-08-25 6:51 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49045
Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution| |FIXED
--- Comment #11 from Jason Merrill <jason at gcc dot gnu.org> 2011-08-25 05:08:46 UTC ---
Fixed as per core decision in Bloomington.
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