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rAKA/third-party/akantu_iterators/include/aka_tuple_tools.hh
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aka_tuple_tools.hh
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/**
* @file aka_tuple_tools.hh
*
* @author Nicolas Richart <nicolas.richart@epfl.ch>
*
* @date creation: Fri Aug 11 2017
* @date last modification: Mon Jan 29 2018
*
* @brief iterator interfaces
*
* @section LICENSE
*
* Copyright 2019 EPFL (Ecole Polytechnique Fédérale de Lausanne)
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* 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/>.
*
*/
/* -------------------------------------------------------------------------- */
#include <tuple>
/* -------------------------------------------------------------------------- */
#ifndef AKANTU_AKA_TUPLE_TOOLS_HH
#define AKANTU_AKA_TUPLE_TOOLS_HH
#ifndef AKANTU_ITERATOR_NAMESPACE
#define AKANTU_ITERATOR_NAMESPACE akantu
#endif
namespace AKANTU_ITERATOR_NAMESPACE {
namespace tuple {
/* ------------------------------------------------------------------------ */
namespace details {
template <size_t N> struct Foreach {
template <class Tuple>
static inline bool not_equal(Tuple && a, Tuple && b) {
if (std::get<N - 1>(std::forward<Tuple>(a)) ==
std::get<N - 1>(std::forward<Tuple>(b)))
return false;
return Foreach<N - 1>::not_equal(std::forward<Tuple>(a),
std::forward<Tuple>(b));
}
};
/* ---------------------------------------------------------------------- */
template <> struct Foreach<0> {
template <class Tuple>
static inline bool not_equal(Tuple && a, Tuple && b) {
return std::get<0>(std::forward<Tuple>(a)) !=
std::get<0>(std::forward<Tuple>(b));
}
};
template <typename... Ts>
decltype(auto) make_tuple_no_decay(Ts &&... args) {
return std::tuple<Ts...>(std::forward<Ts>(args)...);
}
template <class F, class Tuple, size_t... Is>
void foreach_impl(F && func, Tuple && tuple,
std::index_sequence<Is...> &&) {
(void)std::initializer_list<int>{
(std::forward<F>(func)(std::get<Is>(std::forward<Tuple>(tuple))),
0)...};
}
template <class F, class Tuple, size_t... Is>
decltype(auto) transform_impl(F && func, Tuple && tuple,
std::index_sequence<Is...> &&) {
return make_tuple_no_decay(
std::forward<F>(func)(std::get<Is>(std::forward<Tuple>(tuple)))...);
}
} // namespace details
/* ------------------------------------------------------------------------ */
template <class Tuple> bool are_not_equal(Tuple && a, Tuple && b) {
return details::Foreach<std::tuple_size<std::decay_t<Tuple>>::value>::
not_equal(std::forward<Tuple>(a), std::forward<Tuple>(b));
}
template <class F, class Tuple> void foreach (F && func, Tuple && tuple) {
return details::foreach_impl(
std::forward<F>(func), std::forward<Tuple>(tuple),
std::make_index_sequence<
std::tuple_size<std::decay_t<Tuple>>::value>{});
}
template <class F, class Tuple>
decltype(auto) transform(F && func, Tuple && tuple) {
return details::transform_impl(
std::forward<F>(func), std::forward<Tuple>(tuple),
std::make_index_sequence<
std::tuple_size<std::decay_t<Tuple>>::value>{});
}
namespace details {
template <class Tuple, std::size_t... Is>
decltype(auto) flatten(Tuple && tuples, std::index_sequence<Is...>) {
return std::tuple_cat(std::get<Is>(tuples)...);
}
} // namespace details
template <class Tuple> decltype(auto) flatten(Tuple && tuples) {
return details::flatten(std::forward<Tuple>(tuples),
std::make_index_sequence<
std::tuple_size<std::decay_t<Tuple>>::value>());
}
} // namespace tuple
} // namespace AKANTU_ITERATOR_NAMESPACE
#endif /* AKANTU_AKA_TUPLE_TOOLS_HH */
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