[boost] Re: reverse_iterator.hpp uploaded

From: jsiek_at_[hidden]
Date: 2000-06-12 21:50:46

This seems like the right solution to me... it worked well just now
for the iterator adaptor implementation I just posted.  I suggest we
add a new file, boost/iterator.hpp with this workaround. A first cut
at this file is in iterator_adaptor.zip in the vault.

Cheers,

Jeremy

Dietmar Kuehl writes:
 > Hi,
 > 
 > > From: <jsiek_at_[hidden]>
 > > > Oh, and on a separate note... there's an issue to be addressed with
 > > > std::iterator and the old g++ lib. I've noticed that in recent
 > > > revisions of boost/operators.hpp some #define's have been appearing
 > > > removing the iterator helpers that use std::iterator. How about
 > > > instead of removing the iterator helpers (which will break all of
 > > my
 > > > code that uses it) we provide std::iterator in boost. I know all
 > > the
 > > > reasons for not putting in std::iterator in boost, but again, its
 > > just
 > > > a workaround for a broken implementation.
 > 
 > My preferred solution to this is a different one, namely what I'm using
 > currently for my directory iterator rewrite:
 > 
 >   namespace boost
 >   {
 >   #if defined(__GNUG__) && !defined(_CXXRT_STD)
 >     template <class Category, class T,
 >       class Distance = BOOST_CSTD ptrdiff_t,
 >       class Pointer = T*, class Reference = T&>
 >     struct iterator
 >     {
 >       typedef T         value_type;
 >       typedef Distance  difference_type;
 >       typedef Pointer   pointer;
 >       typedef Reference reference;
 >       typedef Category  iterator_category;
 >     };
 >   #else
 >     template <class Category, class T,
 >       class Distance = BOOST_CSTD ptrdiff_t,
 >       class Pointer = T*, class Reference = T&>
 >       struct BOOST_DECL iterator:
 >   #  if defined(_MSC_VER)
 >       std::iterator<Category, T, Distance>
 >   #  else
 >       std::iterator<Category, T, Distance, Pointer, Reference>
 >   #  endif
 >       {
 >       };
 >   #endif
 >   }
 > 
 > The reason for this hack is that neither the library shipping with
 > gcc nor the library shipping with MSVC++ provide a usable version of
 > 'std::iterator'. Thus, this code defines a 'boost::iterator' which does
 > something suitable... Of course, the if/defs need to be extended to
 > cover more compilers (my preferred solution to *this* problem would be
 > the use of autoconf but I think we were through this and rejected
 > autoconf mainly because most people didn't like it, if I remember
 > correctly...).
 > 
 > Regards,
 >   Dietmar
 > 
 > =====
 > <mailto:dietmar_kuehl_at_[hidden]>
 > <http://www.dietmar-kuehl.de/>
 > 
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