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#ifndef PYTHONIC_INCLUDE_UTILS_ITERATOR_HPP
#define PYTHONIC_INCLUDE_UTILS_ITERATOR_HPP
PYTHONIC_NS_BEGIN
namespace utils
{
template <class T>
struct comparable_iterator : T {
comparable_iterator();
comparable_iterator(T const &t);
bool operator<(comparable_iterator<T> other);
};
// Utility class to remind sequence we are iterating on to avoid dangling
// reference
template <bool as_tuple, class T, class... Others>
struct iterator_reminder;
template <class T, class... Others>
struct iterator_reminder<true, T, Others...> {
std::tuple<T, Others...> values;
// FIXME : It works only because template arguments are ! references
// so it trigger a copy.
iterator_reminder() = default;
iterator_reminder(T const &v, Others const &... o);
};
template <class T>
struct iterator_reminder<false, T> {
T values;
iterator_reminder() = default;
iterator_reminder(T const &v);
};
template <class T>
struct iterator_reminder<true, T> {
std::tuple<T> values;
iterator_reminder() = default;
iterator_reminder(T const &v);
};
/* Get the "minimum" of all iterators :
- only random => random
- at least one forward => forward
*/
template <typename... Iters>
struct iterator_min;
template <typename T>
struct iterator_min<T> {
using type = typename std::iterator_traits<T>::iterator_category;
};
template <typename T, typename... Iters>
struct iterator_min<T, Iters...> {
using type = typename std::conditional<
std::is_same<typename std::iterator_traits<T>::iterator_category,
std::forward_iterator_tag>::value,
std::forward_iterator_tag, typename iterator_min<Iters...>::type>::type;
};
}
PYTHONIC_NS_END
#endif
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