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Thu, May 2, 03:28

ranges.hh
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/*
* SPDX-License-Indentifier: AGPL-3.0-or-later
*
* Copyright (©) 2016-2023 EPFL (École Polytechnique Fédérale de Lausanne),
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
* Copyright (©) 2020-2023 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 RANGES_HH
#define RANGES_HH
/* -------------------------------------------------------------------------- */
#include "iterator.hh"
#include "static_types.hh"
#include "mpi_interface.hh"
/* -------------------------------------------------------------------------- */
namespace tamaas {
/* -------------------------------------------------------------------------- */
/// Range class for complex iterators
template <typename LocalType, typename ValueType, UInt local_size>
class Range {
public:
class iterator : public iterator_::iterator<ValueType> {
using parent = iterator_::iterator<ValueType>;
public:
using value_type = LocalType;
using reference = value_type;
iterator(const parent& o) : parent(o) {}
inline reference operator*() { return LocalType(this->data); }
inline reference operator*() const { return LocalType(this->data); }
};
public:
// useful type trait
template <typename Container>
struct is_valid_container
: std::is_same<
std::remove_cv_t<typename std::decay_t<Container>::value_type>,
std::remove_cv_t<ValueType>> {};
public:
using value_type = LocalType;
using reference = value_type&&;
/// Construct from a container
template <class Container>
Range(Container&& cont) : _begin(cont.begin()), _end(cont.end()) {
if (cont.getNbComponents() != local_size)
TAMAAS_EXCEPTION(
"Number of components does not match local tensor type size ("
<< cont.getNbComponents() << ", expected " << local_size << ")");
_begin.setStep(local_size);
_end.setStep(local_size);
}
/// Construct from two iterators
Range(iterator _begin, iterator _end)
: _begin(std::move(_begin)), _end(std::move(_end)) {}
iterator begin() { return _begin; }
iterator end() { return _end; }
Range headless() const {
iterator shift(_begin);
if (mpi::rank() == 0)
++shift;
return Range{shift, _end};
}
private:
iterator _begin, _end;
};
/// Make range with proxy type
template <typename LocalType, class Container>
std::enable_if_t<
is_proxy<LocalType>::value,
Range<LocalType, typename LocalType::value_type, LocalType::size>>
range(Container&& cont) {
using RangeClass =
Range<LocalType, typename LocalType::value_type, LocalType::size>;
static_assert(
RangeClass::template is_valid_container<Container>::value,
"Mismatch between range's value type and container's value type");
return RangeClass(std::forward<Container>(cont));
}
/// Make range with standard type
template <typename LocalType, class Container>
std::enable_if_t<not is_proxy<LocalType>::value, Range<LocalType, LocalType, 1>>
range(Container&& cont) {
using RangeClass = Range<LocalType, LocalType, 1>;
static_assert(
RangeClass::template is_valid_container<Container>::value,
"Mismatch between range's value type and container's value type");
return RangeClass(std::forward<Container>(cont));
}
/* -------------------------------------------------------------------------- */
} // namespace tamaas
#endif

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