Re: [Boost-Users] Permutation Iterator Adaptor Problem

19 Feb 2002

      I've discovered the difference between the
http://www.boost.org/libs/utility/permutation_iterator.htm example and the
http://www.boost.org/libs/utility/iterator_adaptor_test.cpp test code is
that the former (along with the example below) use vector<int> as the
element_range_type, while the latter uses deque<int>. In my environment,
permutation iterator works when used with deques but doesn't compile using
vector as exhibited below. I've copied the test case and replaced deque with
vector reproducing the problem.

Again the compiler complains about "struct
boost::detail::iterator_traits_::undefined<void>". Since Toon says that the
below code works with with gcc-2.95.3 as well as gcc-3.0.3, does any one
know of MSVC vector issues that could be the source of this problem? I will
try this using MSVC and STLPORT this evening on another machine to see if
the problem persists.

Thanks, Jeff

----- Original Message -----
From: "Toon Knapen" <toon.knapen@si-lab.org>
To: <Boost-Users@yahoogroups.com>
Sent: Tuesday, February 19, 2002 3:02 AM
Subject: Re: [Boost-Users] Permutation Iterator Adaptor Problem
...
I just tried your code with gcc-2.95.3 as well as gcc-3.0.3 and no
problems there.
Looking at the status page, the iterator_adaptors test, which includes a
test for the permutation_iterator, compiles fine with VC++ 6.0 SP5. I
don't use windows though so that's all I can say at this point.
I do want to add that, if your compilation succeeds, you will have a
runtime error. The only index you have is '1' although the elements
container is of size() 1 (and thus the only valid index is zero)
Jeff Flinn - wwnet wrote:
...
I'm trying to use the Permutation Iterator adaptor on MSV++ w/SP5 with
boost_1_27_0. Below is a simplification of the example on the web site,
which results in the compiler error found below function main: Any
ideas?
#include <list>
#include <vector>
#include <boost/permutation_iterator.hpp>
int main(int argc, char* argv[])
{
   typedef std::vector          < int > tElements; typedef
tElements::iterator tEItr;
   typedef std::list            < int > tIdxs;     typedef
tIdxs::iterator tIItr;
   typedef std::ostream_iterator< int > tOItr;
tElements elements( 1, 1 );
   tIdxs     indices ( 1, 1 );
typedef boost::permutation_iterator_generator< tEItr, tIItr >::type
tPItr;
tPItr begin = boost::make_permutation_iterator( elements.begin(),
indices.begin() );
int val = *begin;
return 0;
}
error C2440: 'initializing' : cannot convert
from 'struct boost::detail::iterator_traits_::undefined<void>'
to 'int'
        Source or target has incomplete type
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