https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120622
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
And indeed in ./pythonic/include/numpy/ndenumerate.hpp we have:
template <class E>
struct ndenumerate_iterator
: std::iterator<
std::random_access_iterator_tag,
std::tuple<types::array_tuple<long, E::value>, typename E::dtype>>
{
long index;
E const &expr;
typename E::dtype *iter;
ndenumerate_iterator();
ndenumerate_iterator(E const &expr, long first);
std::tuple<types::array_tuple<long, E::value>, typename E::dtype>
operator*() const;
ndenumerate_iterator &operator++();
ndenumerate_iterator &operator+=(long n);
bool operator!=(ndenumerate_iterator const &other) const;
bool operator<(ndenumerate_iterator const &other) const;
long operator-(ndenumerate_iterator const &other) const;
};
This type does not meet the C++ standard's requirements for any kind of
iterator (certainly not a random access iterator).
Adding this member function fixes the testcase:
bool operator==(ndenumerate_iterator const &other) const { return !(*this
!= other); }
However, it's still not a valid iterator because it has no postfix increment,
operator++(int)
And it's not a valid random access iterator, because it has no operator[] and
no operator-- and no operator--(int) and its operator* doesn't return a
reference.
