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From: "brooks at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/63540] New: Erroneous "'Derived' declares a move constructor or move assignment operator" in error.
Date: Wed, 15 Oct 2014 02:31:00 -0000 [thread overview]
Message-ID: <bug-63540-4@http.gcc.gnu.org/bugzilla/> (raw)
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63540
Bug ID: 63540
Summary: Erroneous "'Derived' declares a move constructor or
move assignment operator" in error.
Product: gcc
Version: 4.9.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: brooks at gcc dot gnu.org
Consider the following reduced testcase:
----
template <typename T, typename = decltype(*static_cast<T*>(0) = 0)> int
break_it();
template <typename> int break_it();
struct Base {
Base(const Base &);
void operator=(Base &&);
};
struct Derived : Base {
using Base::operator=;
};
int a = break_it<Derived>();
Derived v(v);
----
With a recent 4.9, it fails with an erroneous error:
----
$ gcc-archive/4.9/215880/bin/g++ --std=gnu++11 t.cc -c -o t.o
t.cc:13:12: error: use of deleted function ‘Derived::Derived(const Derived&)’
Derived v(v);
^
t.cc:8:8: note: ‘Derived::Derived(const Derived&)’ is implicitly declared as
deleted because ‘Derived’ declares a move constructor or move assignment
operator
struct Derived : Base {
^
----
The same erroneous error occurs on trunk.
The call to 'Derived::operator=' in a SFINAE context within break_it seems to
be confusing GCC about which special members Derived declares.
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From: "ppluzhnikov at google dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/63540] Erroneous "'Derived' declares a move constructor or move assignment operator" in error.
Date: Wed, 15 Oct 2014 02:42:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 4.9.2
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: ppluzhnikov at google dot com
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Priority: P3
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Message-ID: <bug-63540-4-2lAHN3JPa0@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-63540-4@http.gcc.gnu.org/bugzilla/>
References: <bug-63540-4@http.gcc.gnu.org/bugzilla/>
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idc540
Paul Pluzhnikov <ppluzhnikov at google dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |ppluzhnikov at google dot com
--- Comment #1 from Paul Pluzhnikov <ppluzhnikov at google dot com> ---
Google ref: b/17785687
next reply other threads:[~2014-10-15 2:31 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-15 2:31 brooks at gcc dot gnu.org [this message]
2014-10-15 9:23 ` [Bug c++/63540] " redi at gcc dot gnu.org
2015-04-27 15:57 ` danregister at poczta dot fm
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