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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/58089] New: expanding empty parameter pack as constructor arguments requires accessible copy constructor
Date: Mon, 05 Aug 2013 14:44:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 4.9.0
X-Bugzilla-Keywords: rejects-valid
X-Bugzilla-Severity: normal
X-Bugzilla-Who: redi at gcc dot gnu.org
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58089

            Bug ID: 58089
           Summary: expanding empty parameter pack as constructor
                    arguments requires accessible copy constructor
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Keywords: rejects-valid
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: redi at gcc dot gnu.org

struct X
{
    X() { }
private:
    X(const X& r);
};


template <typename... Args>
void f(Args&&... args)
{
    X t(args...);
}


int main()
{
    f();
}


$ g++ -std=gnu++11 t.cc
t.cc: In instantiation of 'void f(Args&& ...) [with Args = {}]':
t.cc:18:7:   required from here
t.cc:5:5: error: 'X::X(const X&)' is private
     X(const X& r);
     ^
t.cc:12:16: error: within this context
     X t(args...);
                ^