[Bug c++/53584] New: [4.7 Regression] [C++0x] deleted function unique_ptr::operator=(const unique_ptr &)

[liling at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53584

             Bug #: 53584
           Summary: [4.7 Regression] [C++0x] deleted function
                    unique_ptr::operator=(const unique_ptr &)
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: liling@gmail.com


The following code can compile with G++ 4.6 but not 4.7.  G++ 4.7 complains
that the deleted function std::unique_ptr<_Tp, _Dp>::operator=(const
std::unique_ptr<_Tp, _Dp>&) is required.  However, please note that the code is
doing a move assignment.  Strangely, removing the customized destructor
~UniqVec makes G++ 4.7 happy.

$ cat test.cpp
#include <memory>
#include <vector>

struct UniqVec : public std::vector<std::unique_ptr<int>> {
    ~UniqVec() {} // Comment this line out and GCC 4.7 will be happy.
};

void f() {
    UniqVec u, v;
    u = std::move(v);
}

$ g++ -c -std=c++0x test.cpp 
In file included from
/usr/lib/gcc/x86_64-redhat-linux/4.7.0/../../../../include/c++/4.7.0/memory:64:0,
                 from test.cpp:1:
/usr/lib/gcc/x86_64-redhat-linux/4.7.0/../../../../include/c++/4.7.0/bits/stl_algobase.h:
In instantiation of ‘static _OI std::__copy_move<false, false,
std::random_access_iterator_tag>::__copy_m(_II, _II, _OI) [with _II = const
std::unique_ptr<int>*; _OI = std::unique_ptr<int>*]’:
/usr/lib/gcc/x86_64-redhat-linux/4.7.0/../../../../include/c++/4.7.0/bits/stl_algobase.h:384:70:
  required from ‘_OI std::__copy_move_a(_II, _II, _OI) [with bool _IsMove =
false; _II = const std::unique_ptr<int>*; _OI = std::unique_ptr<int>*]’
/usr/lib/gcc/x86_64-redhat-linux/4.7.0/../../../../include/c++/4.7.0/bits/stl_algobase.h:422:39:
  required from ‘_OI std::__copy_move_a2(_II, _II, _OI) [with bool _IsMove =
false; _II = __gnu_cxx::__normal_iterator<const std::unique_ptr<int>*,
std::vector<std::unique_ptr<int> > >; _OI =
__gnu_cxx::__normal_iterator<std::unique_ptr<int>*,
std::vector<std::unique_ptr<int> > >]’
/usr/lib/gcc/x86_64-redhat-linux/4.7.0/../../../../include/c++/4.7.0/bits/stl_algobase.h:454:18:
  required from ‘_OI std::copy(_II, _II, _OI) [with _II =
__gnu_cxx::__normal_iterator<const std::unique_ptr<int>*,
std::vector<std::unique_ptr<int> > >; _OI =
__gnu_cxx::__normal_iterator<std::unique_ptr<int>*,
std::vector<std::unique_ptr<int> > >]’
/usr/lib/gcc/x86_64-redhat-linux/4.7.0/../../../../include/c++/4.7.0/bits/vector.tcc:197:8:
  required from ‘std::vector<_Tp, _Alloc>& std::vector<_Tp,
_Alloc>::operator=(const std::vector<_Tp, _Alloc>&) [with _Tp =
std::unique_ptr<int>; _Alloc = std::allocator<std::unique_ptr<int> >]’
test.cpp:4:8:   required from here
/usr/lib/gcc/x86_64-redhat-linux/4.7.0/../../../../include/c++/4.7.0/bits/stl_algobase.h:329:8:
error: use of deleted function ‘std::unique_ptr<_Tp, _Dp>& std::unique_ptr<_Tp,
_Dp>::operator=(const std::unique_ptr<_Tp, _Dp>&) [with _Tp = int; _Dp =
std::default_delete<int>]’
In file included from
/usr/lib/gcc/x86_64-redhat-linux/4.7.0/../../../../include/c++/4.7.0/memory:86:0,
                 from test.cpp:1:
/usr/lib/gcc/x86_64-redhat-linux/4.7.0/../../../../include/c++/4.7.0/bits/unique_ptr.h:257:19:
error: declared here
In file included from
/usr/lib/gcc/x86_64-redhat-linux/4.7.0/../../../../include/c++/4.7.0/memory:64:0,
                 from test.cpp:1:
/usr/lib/gcc/x86_64-redhat-linux/4.7.0/../../../../include/c++/4.7.0/bits/stl_algobase.h:
In instantiation of ‘static _OI std::__copy_move<false, false,
std::random_access_iterator_tag>::__copy_m(_II, _II, _OI) [with _II =
std::unique_ptr<int>*; _OI = std::unique_ptr<int>*]’:
/usr/lib/gcc/x86_64-redhat-linux/4.7.0/../../../../include/c++/4.7.0/bits/stl_algobase.h:384:70:
  required from ‘_OI std::__copy_move_a(_II, _II, _OI) [with bool _IsMove =
false; _II = std::unique_ptr<int>*; _OI = std::unique_ptr<int>*]’
/usr/lib/gcc/x86_64-redhat-linux/4.7.0/../../../../include/c++/4.7.0/bits/stl_algobase.h:422:39:
  required from ‘_OI std::__copy_move_a2(_II, _II, _OI) [with bool _IsMove =
false; _II = std::unique_ptr<int>*; _OI = std::unique_ptr<int>*]’
/usr/lib/gcc/x86_64-redhat-linux/4.7.0/../../../../include/c++/4.7.0/bits/stl_algobase.h:454:18:
  required from ‘_OI std::copy(_II, _II, _OI) [with _II =
std::unique_ptr<int>*; _OI = std::unique_ptr<int>*]’
/usr/lib/gcc/x86_64-redhat-linux/4.7.0/../../../../include/c++/4.7.0/bits/vector.tcc:202:8:
  required from ‘std::vector<_Tp, _Alloc>& std::vector<_Tp,
_Alloc>::operator=(const std::vector<_Tp, _Alloc>&) [with _Tp =
std::unique_ptr<int>; _Alloc = std::allocator<std::unique_ptr<int> >]’
test.cpp:4:8:   required from here
/usr/lib/gcc/x86_64-redhat-linux/4.7.0/../../../../include/c++/4.7.0/bits/stl_algobase.h:329:8:
error: use of deleted function ‘std::unique_ptr<_Tp, _Dp>& std::unique_ptr<_Tp,
_Dp>::operator=(const std::unique_ptr<_Tp, _Dp>&) [with _Tp = int; _Dp =
std::default_delete<int>]’
In file included from
/usr/lib/gcc/x86_64-redhat-linux/4.7.0/../../../../include/c++/4.7.0/memory:86:0,
                 from test.cpp:1:
/usr/lib/gcc/x86_64-redhat-linux/4.7.0/../../../../include/c++/4.7.0/bits/unique_ptr.h:257:19:
error: declared here
In file included from
/usr/lib/gcc/x86_64-redhat-linux/4.7.0/../../../../include/c++/4.7.0/memory:66:0,
                 from test.cpp:1:
/usr/lib/gcc/x86_64-redhat-linux/4.7.0/../../../../include/c++/4.7.0/bits/stl_construct.h:
In instantiation of ‘void std::_Construct(_T1*, _Args&& ...) [with _T1 =
std::unique_ptr<int>; _Args = {std::unique_ptr<int, std::default_delete<int>
>&}]’:
/usr/lib/gcc/x86_64-redhat-linux/4.7.0/../../../../include/c++/4.7.0/bits/stl_uninitialized.h:77:3:
  required from ‘static _ForwardIterator
std::__uninitialized_copy<_TrivialValueTypes>::__uninit_copy(_InputIterator,
_InputIterator, _ForwardIterator) [with _InputIterator = std::unique_ptr<int>*;
_ForwardIterator = std::unique_ptr<int>*; bool _TrivialValueTypes = false]’
/usr/lib/gcc/x86_64-redhat-linux/4.7.0/../../../../include/c++/4.7.0/bits/stl_uninitialized.h:119:41:
  required from ‘_ForwardIterator std::uninitialized_copy(_InputIterator,
_InputIterator, _ForwardIterator) [with _InputIterator = std::unique_ptr<int>*;
_ForwardIterator = std::unique_ptr<int>*]’
/usr/lib/gcc/x86_64-redhat-linux/4.7.0/../../../../include/c++/4.7.0/bits/stl_uninitialized.h:260:63:
  required from ‘_ForwardIterator std::__uninitialized_copy_a(_InputIterator,
_InputIterator, _ForwardIterator, std::allocator<_Tp>&) [with _InputIterator =
std::unique_ptr<int>*; _ForwardIterator = std::unique_ptr<int>*; _Tp =
std::unique_ptr<int>]’
/usr/lib/gcc/x86_64-redhat-linux/4.7.0/../../../../include/c++/4.7.0/bits/vector.tcc:204:8:
  required from ‘std::vector<_Tp, _Alloc>& std::vector<_Tp,
_Alloc>::operator=(const std::vector<_Tp, _Alloc>&) [with _Tp =
std::unique_ptr<int>; _Alloc = std::allocator<std::unique_ptr<int> >]’
test.cpp:4:8:   required from here
/usr/lib/gcc/x86_64-redhat-linux/4.7.0/../../../../include/c++/4.7.0/bits/stl_construct.h:77:7:
error: use of deleted function ‘std::unique_ptr<_Tp, _Dp>::unique_ptr(const
std::unique_ptr<_Tp, _Dp>&) [with _Tp = int; _Dp = std::default_delete<int>]’
In file included from
/usr/lib/gcc/x86_64-redhat-linux/4.7.0/../../../../include/c++/4.7.0/memory:86:0,
                 from test.cpp:1:
/usr/lib/gcc/x86_64-redhat-linux/4.7.0/../../../../include/c++/4.7.0/bits/unique_ptr.h:256:7:
error: declared here
In file included from
/usr/lib/gcc/x86_64-redhat-linux/4.7.0/../../../../include/c++/4.7.0/memory:66:0,
                 from test.cpp:1:
/usr/lib/gcc/x86_64-redhat-linux/4.7.0/../../../../include/c++/4.7.0/bits/stl_construct.h:
In instantiation of ‘void std::_Construct(_T1*, _Args&& ...) [with _T1 =
std::unique_ptr<int>; _Args = {const std::unique_ptr<int,
std::default_delete<int> >&}]’:
/usr/lib/gcc/x86_64-redhat-linux/4.7.0/../../../../include/c++/4.7.0/bits/stl_uninitialized.h:77:3:
  required from ‘static _ForwardIterator
std::__uninitialized_copy<_TrivialValueTypes>::__uninit_copy(_InputIterator,
_InputIterator, _ForwardIterator) [with _InputIterator =
__gnu_cxx::__normal_iterator<const std::unique_ptr<int>*,
std::vector<std::unique_ptr<int> > >; _ForwardIterator = std::unique_ptr<int>*;
bool _TrivialValueTypes = false]’
/usr/lib/gcc/x86_64-redhat-linux/4.7.0/../../../../include/c++/4.7.0/bits/stl_uninitialized.h:119:41:
  required from ‘_ForwardIterator std::uninitialized_copy(_InputIterator,
_InputIterator, _ForwardIterator) [with _InputIterator =
__gnu_cxx::__normal_iterator<const std::unique_ptr<int>*,
std::vector<std::unique_ptr<int> > >; _ForwardIterator =
std::unique_ptr<int>*]’
/usr/lib/gcc/x86_64-redhat-linux/4.7.0/../../../../include/c++/4.7.0/bits/stl_uninitialized.h:260:63:
  required from ‘_ForwardIterator std::__uninitialized_copy_a(_InputIterator,
_InputIterator, _ForwardIterator, std::allocator<_Tp>&) [with _InputIterator =
__gnu_cxx::__normal_iterator<const std::unique_ptr<int>*,
std::vector<std::unique_ptr<int> > >; _ForwardIterator = std::unique_ptr<int>*;
_Tp = std::unique_ptr<int>]’
/usr/lib/gcc/x86_64-redhat-linux/4.7.0/../../../../include/c++/4.7.0/bits/stl_vector.h:1112:8:
  required from ‘std::vector<_Tp, _Alloc>::pointer std::vector<_Tp,
_Alloc>::_M_allocate_and_copy(std::vector<_Tp, _Alloc>::size_type,
_ForwardIterator, _ForwardIterator) [with _ForwardIterator =
__gnu_cxx::__normal_iterator<const std::unique_ptr<int>*,
std::vector<std::unique_ptr<int> > >; _Tp = std::unique_ptr<int>; _Alloc =
std::allocator<std::unique_ptr<int> >; std::vector<_Tp, _Alloc>::pointer =
std::unique_ptr<int>*; std::vector<_Tp, _Alloc>::size_type = long unsigned
int]’
/usr/lib/gcc/x86_64-redhat-linux/4.7.0/../../../../include/c++/4.7.0/bits/vector.tcc:186:19:
  required from ‘std::vector<_Tp, _Alloc>& std::vector<_Tp,
_Alloc>::operator=(const std::vector<_Tp, _Alloc>&) [with _Tp =
std::unique_ptr<int>; _Alloc = std::allocator<std::unique_ptr<int> >]’
test.cpp:4:8:   required from here
/usr/lib/gcc/x86_64-redhat-linux/4.7.0/../../../../include/c++/4.7.0/bits/stl_construct.h:77:7:
error: use of deleted function ‘std::unique_ptr<_Tp, _Dp>::unique_ptr(const
std::unique_ptr<_Tp, _Dp>&) [with _Tp = int; _Dp = std::default_delete<int>]’
In file included from
/usr/lib/gcc/x86_64-redhat-linux/4.7.0/../../../../include/c++/4.7.0/memory:86:0,
                 from test.cpp:1:
/usr/lib/gcc/x86_64-redhat-linux/4.7.0/../../../../include/c++/4.7.0/bits/unique_ptr.h:256:7:
error: declared here