[boost] [shifted_ptr] __normal_iterator ..?

From: Phil Bouchard (philippe_at_[hidden])
Date: 2008-06-20 04:36:49

Hi,

Upon trying to create the new shifted_allocator class that is instead to be 
passed as a template parameter on STL containers, I got stuck in a circle or 
errors.  I came to realize there was not way to replace internal pointers 
used by containers with smart pointers... which is very unfortunate.  There 
are different solution I could take but hopefully I won't need them.

By trying compiling shifted_ptr_test2.cpp in the Sandbox we'll get the 
following errors.  I believe shifted_allocator (in shifted_allocator.hpp) 
should be represented the way it is but I may likely got something wrong 
because I haven't followed the verdict on this in previous posts:

...stl_vector.h: In member function `__gnu_cxx::__normal_iterator<typename 
_Alloc::const_pointer, std::vector<_Tp, _Alloc> > std::vector<_Tp, 
_Alloc>::begin() const [with _Tp = boost::detail::sh::shifted_ptr<vector>, 
_Alloc = boost::shifted_allocator<boost::detail::sh::shifted_ptr<vector> 
 >]':
...stl_vector.h:221:   instantiated from `std::vector<_Tp, 
_Alloc>::vector(const std::vector<_Tp, _Alloc>&) [with _Tp = 
boost::detail::sh::shifted_ptr<vector>, _Alloc = 
boost::shifted_allocator<boost::detail::sh::shifted_ptr<vector> >]'
shifted_ptr_test2.cpp:66:   instantiated from here

...stl_vector.h:322: error: no matching function for call to 
`__gnu_cxx::__normal_iterator<const 
boost::detail::sh::shifted<boost::detail::sh::shifted_ptr<vector> >*, 
std::vector<boost::detail::sh::shifted_ptr<vector>, 
boost::shifted_allocator<boost::detail::sh::shifted_ptr<vector> > > 
 >::__normal_iterator(boost::detail::sh::shifted_ptr<vector>* const&)'

...stl_iterator.h:587: note: candidates are: 
__gnu_cxx::__normal_iterator<const 
boost::detail::sh::shifted<boost::detail::sh::shifted_ptr<vector> >*, 
std::vector<boost::detail::sh::shifted_ptr<vector>, 
boost::shifted_allocator<boost::detail::sh::shifted_ptr<vector> > > 
 >::__normal_iterator(const __gnu_cxx::__normal_iterator<const 
boost::detail::sh::shifted<boost::detail::sh::shifted_ptr<vector> >*, 
std::vector<boost::detail::sh::shifted_ptr<vector>, 
boost::shifted_allocator<boost::detail::sh::shifted_ptr<vector> > > >&)
...stl_iterator.h:603: note: 
__gnu_cxx::__normal_iterator<_Iterator, _Container>::__normal_iterator(const 
_Iterator&) [with _Iterator = const 
boost::detail::sh::shifted<boost::detail::sh::shifted_ptr<vector> >*, 
_Container = std::vector<boost::detail::sh::shifted_ptr<vector>, 
boost::shifted_allocator<boost::detail::sh::shifted_ptr<vector> > >]
...stl_iterator.h:600: note: 
__gnu_cxx::__normal_iterator<_Iterator, _Container>::__normal_iterator() 
[with _Iterator = const 
boost::detail::sh::shifted<boost::detail::sh::shifted_ptr<vector> >*, 
_Container = std::vector<boost::detail::sh::shifted_ptr<vector>, 
boost::shifted_allocator<boost::detail::sh::shifted_ptr<vector> > >]

The Vault version presents the same code except the comment of line 67 & 68 
in shifted_ptr_test2.cpp will need to be swapped:
http://www.boostpro.com/vault/index.php?action=downloadfile&filename=shifted_ptr.zip&directory=Memory

-Phil