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apply.hh
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Sun, Apr 28, 00:31

apply.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)
*
* 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 APPLY_HH
#define APPLY_HH
/* -------------------------------------------------------------------------- */
#include "tamaas.hh"
#include <cstddef>
#include <thrust/tuple.h>
#include <utility>
/* -------------------------------------------------------------------------- */
namespace tamaas {
namespace detail {
/// Helper function for application of a functor on a thrust::tuple
template <size_t nargs>
struct Apply {
template <typename Functor, typename Tuple, typename... Args>
__host__ __device__ static auto apply(Functor&& func, Tuple&& t,
Args&&... args)
-> decltype(Apply<nargs - 1>::apply(std::forward<Functor>(func),
std::forward<Tuple>(t),
thrust::get<nargs - 1>(t),
std::forward<Args>(args)...)) {
return Apply<nargs - 1>::apply(
std::forward<Functor>(func), std::forward<Tuple>(t),
thrust::get<nargs - 1>(t), std::forward<Args>(args)...);
}
};
template <>
struct Apply<0> {
template <typename Functor, typename Tuple, typename... Args>
__host__ __device__ static auto apply(Functor&& func, Tuple&& /*t*/,
Args&&... args)
-> decltype(func(std::forward<Args>(args)...)) {
return func(std::forward<Args>(args)...);
}
};
/// Helper class for functor application in thrust
template <typename Functor, typename ret_type = void>
class ApplyFunctor {
public:
__host__ __device__ ApplyFunctor(const Functor& functor) : functor(functor) {}
__host__ __device__ ApplyFunctor(const ApplyFunctor& o)
: functor(o.functor) {}
template <typename Tuple>
__host__ __device__ ret_type operator()(Tuple&& t) const {
return Apply<thrust::tuple_size<typename std::remove_reference<
Tuple>::type>::value>::apply(functor, std::forward<Tuple>(t));
}
private:
const Functor& functor;
};
} // namespace detail
} // namespace tamaas
#endif

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