Limit operations on vector::pointer to NullablePointer requirements.

	* include/bits/stl_vector.h (_Vector_base::_Vector_impl,
	_Vector_base::_M_allocate): NullablePointer requirements do not
	include initialization from literal zero, use value-initialization.
	* include/bits/vector.tcc (vector::_M_insert_aux,
	vector::_M_explace_back_aux): Likewise for assignment.

From-SVN: r209377

libstdc++-v3/ChangeLog

+2014-04-14  Jonathan Wakely  <jwakely@redhat.com>
+
+	* include/bits/stl_vector.h (_Vector_base::_Vector_impl,
+	_Vector_base::_M_allocate): NullablePointer requirements do not
+	include initialization from literal zero, use value-initialization.
+	* include/bits/vector.tcc (vector::_M_insert_aux,
+	vector::_M_explace_back_aux): Likewise for assignment.
+
 2014-04-11  Marc Glisse  <marc.glisse@inria.fr>
 
 	PR libstdc++/59434

libstdc++-v3/include/bits/stl_vector.h

@@ -84,17 +84,17 @@ _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
 	pointer _M_end_of_storage;
 
 	_Vector_impl()
-	: _Tp_alloc_type(), _M_start(0), _M_finish(0), _M_end_of_storage(0)
+	: _Tp_alloc_type(), _M_start(), _M_finish(), _M_end_of_storage()
 	{ }
 
 	_Vector_impl(_Tp_alloc_type const& __a) _GLIBCXX_NOEXCEPT
-	: _Tp_alloc_type(__a), _M_start(0), _M_finish(0), _M_end_of_storage(0)
+	: _Tp_alloc_type(__a), _M_start(), _M_finish(), _M_end_of_storage()
 	{ }
 
 #if __cplusplus >= 201103L
 	_Vector_impl(_Tp_alloc_type&& __a) noexcept
 	: _Tp_alloc_type(std::move(__a)),
-	  _M_start(0), _M_finish(0), _M_end_of_storage(0)
+	  _M_start(), _M_finish(), _M_end_of_storage()
 	{ }
 #endif
 
@@ -167,7 +167,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
       _M_allocate(size_t __n)
       {
 	typedef __gnu_cxx::__alloc_traits<_Tp_alloc_type> _Tr;
-	return __n != 0 ? _Tr::allocate(_M_impl, __n) : 0;
+	return __n != 0 ? _Tr::allocate(_M_impl, __n) : pointer();
       }
 
       void

libstdc++-v3/include/bits/vector.tcc

@@ -362,7 +362,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
 #else
 	                               __x);
 #endif
-	      __new_finish = 0;
+	      __new_finish = pointer();
 
 	      __new_finish
 		= std::__uninitialized_move_if_noexcept_a
@@ -412,7 +412,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
 	  {
 	    _Alloc_traits::construct(this->_M_impl, __new_start + size(),
 				     std::forward<_Args>(__args)...);
-	    __new_finish = 0;
+	    __new_finish = pointer();
 
 	    __new_finish
 	      = std::__uninitialized_move_if_noexcept_a
@@ -493,7 +493,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
 		  std::__uninitialized_fill_n_a(__new_start + __elems_before,
 						__n, __x,
 						_M_get_Tp_allocator());
-		  __new_finish = 0;
+		  __new_finish = pointer();
 
 		  __new_finish
 		    = std::__uninitialized_move_if_noexcept_a