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aka_array_view.hh
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/**
* Copyright (©) 2010-2023 EPFL (Ecole Polytechnique Fédérale de Lausanne)
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* This file is part of Akantu
*
* Akantu is free software: you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License as published by the Free
* Software Foundation, either version 3 of the License, or (at your option) any
* later version.
*
* Akantu is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
* A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
* details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with Akantu. If not, see <http://www.gnu.org/licenses/>.
*/
/* -------------------------------------------------------------------------- */
// IWYU pragma: private, include "aka_array.hh"
/* -------------------------------------------------------------------------- */
#include "aka_array.hh"
#include "aka_common.hh"
/* -------------------------------------------------------------------------- */
#include <cstddef>
#include <functional>
#include <tuple>
#include <type_traits>
/* -------------------------------------------------------------------------- */
#ifndef AKANTU_ARRAY_VIEW_HH
#define AKANTU_ARRAY_VIEW_HH
namespace akantu {
/* ------------------------------------------------------------------------ */
/* Views */
/* ------------------------------------------------------------------------ */
namespace detail {
template <typename Array, typename... Ns> class ArrayView {
using tuple = std::tuple<Ns...>;
public:
using size_type = Idx;
using pointer = decltype(std::declval<Array>().data());
~ArrayView() = default;
constexpr ArrayView(Array && array, Ns... ns) noexcept
: array(array), sizes(std::move(ns)...) {}
constexpr ArrayView(const ArrayView & array_view) = default;
constexpr ArrayView(ArrayView && array_view) noexcept = default;
constexpr ArrayView & operator=(const ArrayView & array_view) = default;
constexpr ArrayView & operator=(ArrayView && array_view) noexcept = default;
auto begin() {
return std::apply(
[&](auto &&... ns) {
return detail::get_iterator(array.get(), array.get().data(),
std::forward<decltype(ns)>(ns)...);
},
sizes);
}
auto begin() const {
return std::apply(
[&](auto &&... ns) {
return detail::get_iterator(array.get(), array.get().data(),
std::forward<decltype(ns)>(ns)...);
},
sizes);
}
auto end() {
return std::apply(
[&](auto &&... ns) {
return detail::get_iterator(
array.get(),
array.get().data() +
detail::product_all(std::forward<decltype(ns)>(ns)...),
std::forward<decltype(ns)>(ns)...);
},
sizes);
}
auto end() const {
return std::apply(
[&](auto &&... ns) {
return detail::get_iterator(
array.get(),
array.get().data() +
detail::product_all(std::forward<decltype(ns)>(ns)...),
std::forward<decltype(ns)>(ns)...);
},
sizes);
}
auto cbegin() const { return this->begin(); }
auto cend() const { return this->end(); }
constexpr auto size() const {
return std::get<std::tuple_size<tuple>::value - 1>(sizes);
}
constexpr auto dims() const { return std::tuple_size<tuple>::value - 1; }
private:
std::reference_wrapper<std::remove_reference_t<Array>> array;
tuple sizes;
};
/* ---------------------------------------------------------------------- */
template <typename T, typename... Ns>
class ArrayView<const ArrayFilter<T> &, Ns...> {
using tuple = std::tuple<Ns...>;
public:
constexpr ArrayView(const ArrayFilter<T> & array, Ns... ns)
: array(array), sizes(std::move(ns)...) {}
constexpr ArrayView(const ArrayView & array_view) = default;
constexpr ArrayView(ArrayView && array_view) = default;
constexpr ArrayView & operator=(const ArrayView & array_view) = default;
constexpr ArrayView & operator=(ArrayView && array_view) = default;
auto begin() const {
return std::apply(
[&](auto &&... ns) {
return array.get().begin_reinterpret(
std::forward<decltype(ns)>(ns)...);
},
sizes);
}
auto end() const {
return std::apply(
[&](auto &&... ns) {
return array.get().end_reinterpret(std::forward<decltype(ns)>(ns)...);
},
sizes);
}
auto cbegin() const { return this->begin(); }
auto cend() const { return this->end(); }
constexpr auto size() const {
return std::get<std::tuple_size<tuple>::value - 1>(sizes);
}
constexpr auto dims() const { return std::tuple_size<tuple>::value - 1; }
private:
std::reference_wrapper<const ArrayFilter<T>> array;
tuple sizes;
};
} // namespace detail
/* ------------------------------------------------------------------------ */
template <typename Array, typename... Ns,
std::enable_if_t<aka::conjunction<
std::is_integral<std::decay_t<Ns>>...>::value> * = nullptr>
auto make_view(Array && array, const Ns... ns) -> decltype(auto) {
AKANTU_DEBUG_ASSERT((detail::product_all(ns...) != 0),
"You must specify non zero dimensions");
// auto size = std::forward<decltype(array)>(array).size() *
// std::forward<decltype(array)>(array).getNbComponent() /
// detail::product_all(ns...);
auto array_size = std::forward<decltype(array)>(array).size();
auto nb_component = std::forward<decltype(array)>(array).getNbComponent();
// detail::GetNbComponent<std::decay_t<Array>>::getNbComponent(
// std::forward<decltype(array)>(array));
auto product_all = detail::product_all(ns...);
auto size = array_size * nb_component / product_all;
return detail::ArrayView<Array, std::common_type_t<size_t, Ns>...,
std::common_type_t<size_t, decltype(size)>>(
std::forward<Array>(array), std::move(ns)..., size);
}
template <typename Array, typename... Ns>
auto make_const_view(const Array & array, const Ns... ns) -> decltype(auto) {
return make_view(array, std::move(ns)...);
}
} // namespace akantu
#endif // AKANTU_ARRAY_VIEW_HH

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