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Kokkos_RandomAccessIterator.hpp
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Kokkos_RandomAccessIterator.hpp
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//@HEADER
// ************************************************************************
//
// Kokkos v. 4.0
// Copyright (2022) National Technology & Engineering
// Solutions of Sandia, LLC (NTESS).
//
// Under the terms of Contract DE-NA0003525 with NTESS,
// the U.S. Government retains certain rights in this software.
//
// Part of Kokkos, under the Apache License v2.0 with LLVM Exceptions.
// See https://kokkos.org/LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//@HEADER
#ifndef KOKKOS_RANDOM_ACCESS_ITERATOR_IMPL_HPP
#define KOKKOS_RANDOM_ACCESS_ITERATOR_IMPL_HPP
#include <iterator>
#include <Kokkos_Macros.hpp>
#include <Kokkos_View.hpp>
#include "Kokkos_Constraints.hpp"
namespace Kokkos {
namespace Experimental {
namespace Impl {
template <class T>
class RandomAccessIterator;
template <class DataType, class... Args>
class RandomAccessIterator< ::Kokkos::View<DataType, Args...> > {
public:
using view_type = ::Kokkos::View<DataType, Args...>;
using iterator_type = RandomAccessIterator<view_type>;
using iterator_category = std::random_access_iterator_tag;
using value_type = typename view_type::value_type;
using difference_type = ptrdiff_t;
using pointer = typename view_type::pointer_type;
using reference = typename view_type::reference_type;
static_assert(view_type::rank == 1 &&
(std::is_same<typename view_type::traits::array_layout,
Kokkos::LayoutLeft>::value ||
std::is_same<typename view_type::traits::array_layout,
Kokkos::LayoutRight>::value ||
std::is_same<typename view_type::traits::array_layout,
Kokkos::LayoutStride>::value),
"RandomAccessIterator only supports 1D Views with LayoutLeft, "
"LayoutRight, LayoutStride.");
KOKKOS_DEFAULTED_FUNCTION RandomAccessIterator() = default;
explicit KOKKOS_FUNCTION RandomAccessIterator(const view_type view)
: m_view(view) {}
explicit KOKKOS_FUNCTION RandomAccessIterator(const view_type view,
ptrdiff_t current_index)
: m_view(view), m_current_index(current_index) {}
template <
class ViewType,
std::enable_if_t<std::is_constructible_v<view_type, ViewType>, int> = 0>
KOKKOS_FUNCTION RandomAccessIterator(
const RandomAccessIterator<ViewType>& other)
: m_view(other.m_view), m_current_index(other.m_current_index) {}
KOKKOS_FUNCTION
iterator_type& operator++() {
++m_current_index;
return *this;
}
KOKKOS_FUNCTION
iterator_type operator++(int) {
auto tmp = *this;
++*this;
return tmp;
}
KOKKOS_FUNCTION
iterator_type& operator--() {
--m_current_index;
return *this;
}
KOKKOS_FUNCTION
iterator_type operator--(int) {
auto tmp = *this;
--*this;
return tmp;
}
KOKKOS_FUNCTION
reference operator[](difference_type n) const {
return m_view(m_current_index + n);
}
KOKKOS_FUNCTION
iterator_type& operator+=(difference_type n) {
m_current_index += n;
return *this;
}
KOKKOS_FUNCTION
iterator_type& operator-=(difference_type n) {
m_current_index -= n;
return *this;
}
KOKKOS_FUNCTION
iterator_type operator+(difference_type n) const {
return iterator_type(m_view, m_current_index + n);
}
KOKKOS_FUNCTION
iterator_type operator-(difference_type n) const {
return iterator_type(m_view, m_current_index - n);
}
KOKKOS_FUNCTION
difference_type operator-(iterator_type it) const {
return m_current_index - it.m_current_index;
}
KOKKOS_FUNCTION
bool operator==(iterator_type other) const {
return m_current_index == other.m_current_index &&
m_view.data() == other.m_view.data();
}
KOKKOS_FUNCTION
bool operator!=(iterator_type other) const {
return m_current_index != other.m_current_index ||
m_view.data() != other.m_view.data();
}
KOKKOS_FUNCTION
bool operator<(iterator_type other) const {
return m_current_index < other.m_current_index;
}
KOKKOS_FUNCTION
bool operator<=(iterator_type other) const {
return m_current_index <= other.m_current_index;
}
KOKKOS_FUNCTION
bool operator>(iterator_type other) const {
return m_current_index > other.m_current_index;
}
KOKKOS_FUNCTION
bool operator>=(iterator_type other) const {
return m_current_index >= other.m_current_index;
}
KOKKOS_FUNCTION
reference operator*() const { return m_view(m_current_index); }
private:
view_type m_view;
ptrdiff_t m_current_index = 0;
template <class>
friend class RandomAccessIterator;
};
} // namespace Impl
} // namespace Experimental
} // namespace Kokkos
#endif