public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
* [Bug c++/58820] New: lambda multiple inheritance operator() not ambiguous
@ 2013-10-21 7:36 sutambe at yahoo dot com
2013-10-21 12:18 ` [Bug c++/58820] " daniel.kruegler at googlemail dot com
2021-08-27 20:47 ` pinskia at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: sutambe at yahoo dot com @ 2013-10-21 7:36 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58820
Bug ID: 58820
Summary: lambda multiple inheritance operator() not ambiguous
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: sutambe at yahoo dot com
The following lambda overloads are not ambiguous but they are reported as such.
template <class... Fs>
struct overload_set : Fs...
{
overload_set(Fs... f)
: Fs(f)...
{}
};
template <class... Fs>
overload_set<Fs...> overload(Fs... x)
{
return overload_set<Fs...>(x...);
}
int main(void)
{
double d = 10;
overload(
[](int i) { },
[](double d) { },
[](char c) { }
)(d);
}
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/58820] lambda multiple inheritance operator() not ambiguous
2013-10-21 7:36 [Bug c++/58820] New: lambda multiple inheritance operator() not ambiguous sutambe at yahoo dot com
@ 2013-10-21 12:18 ` daniel.kruegler at googlemail dot com
2021-08-27 20:47 ` pinskia at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: daniel.kruegler at googlemail dot com @ 2013-10-21 12:18 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58820
--- Comment #1 from Daniel Krügler <daniel.kruegler at googlemail dot com> ---
This looks like a more fundamental name lookup problem of gcc to me. It can be
reproduced with function object types that are no lambda closures:
template <class... Fs>
struct overload_set : Fs...
{
overload_set(Fs... f)
: Fs(f)...
{}
};
template <class... Fs>
overload_set<Fs...> overload(Fs... x)
{
return overload_set<Fs...>(x...);
}
template<class T>
struct Closure
{
void operator()(T) const {}
using FPtr = void(*)(T);
operator FPtr() const;
};
int main()
{
double d = 10;
overload(
Closure<int>(),
Closure<double>(),
Closure<char>()
)(d);
}
>From gcc-bugs-return-432353-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 21 12:22:52 2013
Return-Path: <gcc-bugs-return-432353-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Delivered-To: listarch-gcc-bugs@gcc.gnu.org
Received: (qmail 19650 invoked by alias); 21 Oct 2013 12:22:51 -0000
Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Id: <gcc-bugs.gcc.gnu.org>
List-Archive: <http://gcc.gnu.org/ml/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-help@gcc.gnu.org>
Sender: gcc-bugs-owner@gcc.gnu.org
Delivered-To: mailing list gcc-bugs@gcc.gnu.org
Received: (qmail 19564 invoked by uid 48); 21 Oct 2013 12:22:47 -0000
From: "paolo.carlini at oracle dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/58820] lambda multiple inheritance operator() not ambiguous
Date: Mon, 21 Oct 2013 12:22:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 4.9.0
X-Bugzilla-Keywords:
X-Bugzilla-Severity: normal
X-Bugzilla-Who: paolo.carlini at oracle dot com
X-Bugzilla-Status: NEW
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags:
X-Bugzilla-Changed-Fields: bug_status cf_reconfirmed_on blocked everconfirmed
Message-ID: <bug-58820-4-IWUD0ZC6e9@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-58820-4@http.gcc.gnu.org/bugzilla/>
References: <bug-58820-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 7bit
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-SW-Source: 2013-10/txt/msg01497.txt.bz2
Content-length: 576
http://gcc.gnu.org/bugzilla/show_bug.cgi?idX820
Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2013-10-21
Blocks|54367 |
Ever confirmed|0 |1
--- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Thanks Daniel. Could even be a duplicate then.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/58820] lambda multiple inheritance operator() not ambiguous
2013-10-21 7:36 [Bug c++/58820] New: lambda multiple inheritance operator() not ambiguous sutambe at yahoo dot com
2013-10-21 12:18 ` [Bug c++/58820] " daniel.kruegler at googlemail dot com
@ 2021-08-27 20:47 ` pinskia at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: pinskia at gcc dot gnu.org @ 2021-08-27 20:47 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58820
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |INVALID
Blocks|54367 |
Status|NEW |RESOLVED
--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Unrelated to lambdas really. Here is a C++98 code which shows the same issue
with clang:
template<class t>
struct i
{
t operator()(t i);
};
struct overload_set1 : i<int>, i<double>
{
overload_set1() {}
};
int main(void)
{
double d1 = 10;
overload_set1 tt;
tt(d1);
}
To make the original code work (you need C++17 really):
Adding
using Fs::operator()...;
allows GCC (and ICC) to work.
So this is a bug in clang.
I don't think we need a testcase as we must likely already have a C++98 one
even.
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54367
[Bug 54367] [meta-bug] lambda expressions
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2021-08-27 20:47 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2013-10-21 7:36 [Bug c++/58820] New: lambda multiple inheritance operator() not ambiguous sutambe at yahoo dot com
2013-10-21 12:18 ` [Bug c++/58820] " daniel.kruegler at googlemail dot com
2021-08-27 20:47 ` pinskia at gcc dot gnu.org
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).