reverse_iterator.hpp

/* VecMem project, part of the ACTS project (R&D line)
 *
 * (c) 2021 CERN for the benefit of the ACTS project
 *
 * Mozilla Public License Version 2.0
 */
#pragma once
 
// Local include(s).
#include "vecmem/utils/types.hpp"
 
// System include(s).
#include <iterator>
 
namespace vecmem {
namespace details {
 
template <typename Iterator>
class reverse_iterator {
 
public:
 
    typedef Iterator iterator_type;
    typedef typename std::iterator_traits<iterator_type>::value_type value_type;
    typedef typename std::iterator_traits<iterator_type>::difference_type
        difference_type;
    typedef typename std::iterator_traits<iterator_type>::pointer pointer;
    typedef typename std::iterator_traits<iterator_type>::reference reference;
 
 
    VECMEM_HOST_AND_DEVICE
    reverse_iterator();
    VECMEM_HOST_AND_DEVICE
    reverse_iterator(iterator_type itr);
 
    VECMEM_HOST_AND_DEVICE
    reverse_iterator(const reverse_iterator& parent);
    template <typename T>
    VECMEM_HOST_AND_DEVICE reverse_iterator(const reverse_iterator<T>& parent);
 
    VECMEM_HOST_AND_DEVICE
    reverse_iterator& operator=(const reverse_iterator& rhs);
 
    VECMEM_HOST_AND_DEVICE
    iterator_type base() const;
 
 
    VECMEM_HOST_AND_DEVICE
    reference operator*() const;
    VECMEM_HOST_AND_DEVICE
    pointer operator->() const;
    VECMEM_HOST_AND_DEVICE
    reference operator[](difference_type n) const;
 
 
 
    VECMEM_HOST_AND_DEVICE
    reverse_iterator& operator++();
    VECMEM_HOST_AND_DEVICE
    reverse_iterator operator++(int);
 
    VECMEM_HOST_AND_DEVICE
    reverse_iterator& operator--();
    VECMEM_HOST_AND_DEVICE
    reverse_iterator operator--(int);
 
    VECMEM_HOST_AND_DEVICE
    reverse_iterator operator+(difference_type n) const;
    VECMEM_HOST_AND_DEVICE
    reverse_iterator& operator+=(difference_type n);
 
    VECMEM_HOST_AND_DEVICE
    reverse_iterator operator-(difference_type n) const;
    VECMEM_HOST_AND_DEVICE
    reverse_iterator& operator-=(difference_type n);
 
 
private:
    template <typename T>
    VECMEM_HOST_AND_DEVICE static T* to_pointer(T* ptr);
    template <typename T>
    VECMEM_HOST_AND_DEVICE static pointer to_pointer(T itr);
 
    iterator_type m_current;
 
};  // class reverse_iterator
 
template <typename T1, typename T2>
VECMEM_HOST_AND_DEVICE bool operator==(const reverse_iterator<T1>& itr1,
                                       const reverse_iterator<T2>& itr2);
template <typename T1, typename T2>
VECMEM_HOST_AND_DEVICE bool operator!=(const reverse_iterator<T1>& itr1,
                                       const reverse_iterator<T2>& itr2);
 
}  // namespace details
}  // namespace vecmem
 
// Include the implementation.
#include "vecmem/containers/impl/reverse_iterator.ipp"