Subject: [Boost-bugs] [Boost C++ Libraries] #3077: Reverse iterator compile-time bug in multi_array
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2009-05-25 10:47:28
#3077: Reverse iterator compile-time bug in multi_array
--------------------------------------------------------+-------------------
Reporter: John Reid <john.reid_at_[hidden]> | Owner: garcia
Type: Bugs | Status: new
Milestone: Boost 1.40.0 | Component: multi_array
Version: Boost 1.38.0 | Severity: Problem
Keywords: |
--------------------------------------------------------+-------------------
I'm having some trouble iterating over a 2-dimensional multi_array in
reverse order. I'm using boost 1.38 with gcc-4.2.4 and the following code
won't compile with the error given below:
{{{
#include <boost/multi_array.hpp>
template< typename It >
void
iterate_over( It begin, It end )
{
while( end != begin ) {
begin->end() - begin->begin();
++begin;
}
}
void
test()
{
boost::multi_array< double, 2 > m;
iterate_over( m.begin(), m.end() ); // works fine
iterate_over( m.rbegin(), m.rend() ); // causes error
}
}}}
This looks to me like a bug in the implementation of the reverse iterator
for multi_array. Am I wrong? It is only a problem when
iterator::operator-> is used. The (*begin). notation works fine.
/home/john/Dev/ThirdParty/boost/boost_1_38_0/boost/iterator/iterator_facade.hpp:
In static member function âstatic typename
boost::mpl::if_<boost::is_reference<Reference>, Pointer,
boost::detail::operator_arrow_proxy<ValueType> >::type
boost::detail::operator_arrow_result<ValueType, Reference,
Pointer>::make(Reference) [with ValueType = boost::multi_array<double,
1ul, std::allocator<double> >, Reference =
boost::detail::multi_array::sub_array<double, 1ul>, Pointer =
boost::multi_array<double, 1ul, std::allocator<double> >*]â:
/home/john/Dev/ThirdParty/boost/boost_1_38_0/boost/iterator/iterator_facade.hpp:648:
instantiated from âtypename boost::detail::operator_arrow_result<typename
boost::detail::iterator_facade_types<Value, CategoryOrTraversal,
Reference, Difference>::value_type, Reference, typename
boost::detail::iterator_facade_types<Value, CategoryOrTraversal,
Reference, Difference>::pointer>::type boost::iterator_facade<I, V, TC, R,
D>::operator->() const [with Derived =
boost::reverse_iterator<boost::detail::multi_array::array_iterator<double,
double*, mpl_::size_t<2ul>, boost::detail::multi_array::sub_array<double,
1ul> > >, Value = boost::multi_array<double, 1ul, std::allocator<double>
>, CategoryOrTraversal =
boost::detail::iterator_category_with_traversal<std::input_iterator_tag,
boost::random_access_traversal_tag>, Reference =
boost::detail::multi_array::sub_array<double, 1ul>, Difference = long
int]â
src/sandbox/seqan_sandbox.cpp:12: instantiated from âvoid
iterate_over(It, It) [with It =
boost::reverse_iterator<boost::detail::multi_array::array_iterator<double,
double*, mpl_::size_t<2ul>, boost::detail::multi_array::sub_array<double,
1ul> > >]â
src/sandbox/seqan_sandbox.cpp:22: instantiated from here
/home/john/Dev/ThirdParty/boost/boost_1_38_0/boost/iterator/iterator_facade.hpp:326:
error: no matching function for call to
âimplicit_cast(boost::detail::multi_array::sub_array<double, 1ul>*)â
-- Ticket URL: <https://svn.boost.org/trac/boost/ticket/3077> Boost C++ Libraries <http://www.boost.org/> Boost provides free peer-reviewed portable C++ source libraries.
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