Hi,
as mentioned in the docs, it is necessary to tell MS VC++
all template parameters of an iterator_adaptor *explicitly*.
Unfortunately, it seems one cannot do that for a permutation_iterator,
since permutation_iterator_generator just takes ElementIterator
and IndexIterator as its template parameters.
I propose extending the code like this:
template< typename ElementIterator, typename IndexIterator,
// Reasonable default, but can be passed explicitly for MSVC:
typename ValueType = boost::detail::iterator_traits<ElementIterator>::value_type
// etc.
>
struct permutation_iterator_generator
{
typedef boost::iterator_adaptor
< ElementIterator,
permutation_iterator_policies< IndexIterator >,
ValueType
// etc.
> type;
};
in order to write something like
typedef permutation_iterator_generator<
element_range_type::iterator,
index_type::iterator,
element_range_type::value_type // tells MSVC++ the value_type
>::type
to keep MSVC quiet.
I'm not sure, but I think I saw the same trick for some other
iterator adaptors. Comments?
- Roland
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