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span.hh
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Tue, Jun 4, 09:32

span.hh
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/*
* SPDX-License-Indentifier: AGPL-3.0-or-later
*
* Copyright (©) 2016-2022 EPFL (École Polytechnique Fédérale de Lausanne),
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
* Copyright (©) 2020-2022 Lucas Frérot
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published
* by the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
*/
/* -------------------------------------------------------------------------- */
#ifndef SPAN_HH
#define SPAN_HH
/* -------------------------------------------------------------------------- */
#include "tamaas.hh"
#include <cstddef>
#include <iterator>
#include <type_traits>
/* -------------------------------------------------------------------------- */
namespace tamaas {
template <typename T>
struct span {
using element_type = T;
using value_type = std::remove_cv_t<T>;
using size_type = std::size_t;
using difference_type = std::ptrdiff_t;
using pointer = T*;
using const_pointer = const T*;
using reference = T&;
using const_reference = const T&;
using iterator = T*;
using reverse_iterator = std::reverse_iterator<iterator>;
constexpr size_type size() const noexcept { return size_; }
constexpr pointer data() const noexcept { return data_; }
constexpr iterator begin() const noexcept { return data_; }
constexpr iterator end() const noexcept { return data_ + size_; }
constexpr iterator begin() noexcept { return data_; }
constexpr iterator end() noexcept { return data_ + size_; }
reference operator[](size_type idx) {
TAMAAS_ASSERT(idx < size_, "index out of span range");
return data_[idx];
}
const_reference operator[](size_type idx) const {
TAMAAS_ASSERT(idx < size_, "index out of span range");
return data_[idx];
}
pointer data_ = nullptr;
size_type size_ = 0;
};
} // namespace tamaas
/* -------------------------------------------------------------------------- */
#endif

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