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tamaas/src/core/loops/loop_utils.hh
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loop_utils.hh
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/**
* @file
* @section LICENSE
*
* Copyright (©) 2016-2020 EPFL (École Polytechnique Fédérale de Lausanne),
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* 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 __LOOP_UTILS_HH__
#define __LOOP_UTILS_HH__
/* -------------------------------------------------------------------------- */
#include "loop.hh"
#include "tamaas.hh"
#include <thrust/functional.h>
#include <limits>
#include <type_traits>
/* -------------------------------------------------------------------------- */
namespace tamaas {
namespace detail {
template <bool only_points = false, typename... Grids>
UInt loopSize(Grids&&... grids) {
return (only_points)
? std::get<0>(std::forward_as_tuple(grids...)).getNbPoints()
: std::get<0>(std::forward_as_tuple(grids...)).dataSize();
}
template <typename... Sizes>
void areAllEqual(bool, UInt) {}
template <typename... Sizes>
void areAllEqual(bool result, UInt prev, UInt current) {
if (!(result && prev == current))
TAMAAS_EXCEPTION("Cannot loop over ranges that do not have the same size!");
}
template <typename... Sizes>
void areAllEqual(bool result, UInt prev, UInt current, Sizes... rest) {
areAllEqual(result && prev == current, current, rest...);
}
} // namespace detail
template <typename... Ranges>
void checkLoopSize(Ranges&&... ranges) {
detail::areAllEqual(true, (ranges.end() - ranges.begin())...);
}
namespace detail {
template <operation op, typename ReturnType>
struct reduction_helper;
template <typename ReturnType>
struct reduction_helper<operation::plus, ReturnType>
: public thrust::plus<ReturnType> {
ReturnType init() const {
return ReturnType(0);
}
};
template <typename ReturnType>
struct reduction_helper<operation::times, ReturnType>
: public thrust::multiplies<ReturnType> {
ReturnType init() const {
return ReturnType(1);
}
};
template <typename ReturnType>
struct reduction_helper<operation::min, ReturnType>
: public thrust::minimum<ReturnType> {
ReturnType init() const {
return std::numeric_limits<ReturnType>::max();
}
};
template <typename ReturnType>
struct reduction_helper<operation::max, ReturnType>
: public thrust::maximum<ReturnType> {
ReturnType init() const {
return std::numeric_limits<ReturnType>::lowest();
}
};
} // namespace detail
} // namespace tamaas
#endif // __LOOP_UTILS_HH
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