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277 lines
7.8 KiB
277 lines
7.8 KiB
/* |
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* Copyright 2008-2012 NVIDIA Corporation |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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#pragma once |
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#include <thrust/detail/config.h> |
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#include <thrust/detail/raw_reference_cast.h> |
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#include <thrust/detail/type_traits.h> |
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#include <thrust/detail/tuple_transform.h> |
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namespace thrust |
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{ |
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namespace detail |
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{ |
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// specialize is_unwrappable |
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// a tuple is_unwrappable if any of its elements is_unwrappable |
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template< |
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typename T0, typename T1, typename T2, |
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typename T3, typename T4, typename T5, |
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typename T6, typename T7, typename T8, |
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typename T9 |
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> |
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struct is_unwrappable< |
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thrust::tuple<T0,T1,T2,T3,T4,T5,T6,T7,T8,T9> |
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> |
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: or_< |
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is_unwrappable<T0>, |
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is_unwrappable<T1>, |
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is_unwrappable<T2>, |
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is_unwrappable<T3>, |
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is_unwrappable<T4>, |
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is_unwrappable<T5>, |
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is_unwrappable<T6>, |
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is_unwrappable<T7>, |
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is_unwrappable<T8>, |
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is_unwrappable<T9> |
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> |
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{}; |
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// specialize is_unwrappable |
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// a tuple_of_iterator_references is_unwrappable if any of its elements is_unwrappable |
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template< |
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typename T0, typename T1, typename T2, |
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typename T3, typename T4, typename T5, |
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typename T6, typename T7, typename T8, |
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typename T9 |
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> |
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struct is_unwrappable< |
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thrust::detail::tuple_of_iterator_references<T0,T1,T2,T3,T4,T5,T6,T7,T8,T9> |
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> |
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: or_< |
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is_unwrappable<T0>, |
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is_unwrappable<T1>, |
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is_unwrappable<T2>, |
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is_unwrappable<T3>, |
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is_unwrappable<T4>, |
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is_unwrappable<T5>, |
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is_unwrappable<T6>, |
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is_unwrappable<T7>, |
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is_unwrappable<T8>, |
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is_unwrappable<T9> |
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> |
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{}; |
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namespace raw_reference_detail |
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{ |
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// unlike raw_reference, |
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// raw_reference_tuple_helper needs to return a value |
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// when it encounters one, rather than a reference |
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// upon encountering tuple, recurse |
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// |
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// we want the following behavior: |
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// 1. T -> T |
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// 2. T& -> T& |
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// 3. null_type -> null_type |
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// 4. reference<T> -> T& |
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// 5. tuple_of_iterator_references<T> -> tuple_of_iterator_references<raw_reference_tuple_helper<T>::type> |
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// wrapped references are unwrapped using raw_reference, otherwise, return T |
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template<typename T> |
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struct raw_reference_tuple_helper |
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: eval_if< |
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is_unwrappable< |
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typename remove_cv<T>::type |
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>::value, |
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raw_reference<T>, |
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identity_<T> |
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> |
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{}; |
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// recurse on tuples |
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template < |
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typename T0, typename T1, typename T2, |
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typename T3, typename T4, typename T5, |
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typename T6, typename T7, typename T8, |
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typename T9 |
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> |
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struct raw_reference_tuple_helper< |
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thrust::tuple<T0,T1,T2,T3,T4,T5,T6,T7,T8,T9> |
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> |
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{ |
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typedef thrust::tuple< |
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typename raw_reference_tuple_helper<T0>::type, |
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typename raw_reference_tuple_helper<T1>::type, |
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typename raw_reference_tuple_helper<T2>::type, |
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typename raw_reference_tuple_helper<T3>::type, |
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typename raw_reference_tuple_helper<T4>::type, |
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typename raw_reference_tuple_helper<T5>::type, |
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typename raw_reference_tuple_helper<T6>::type, |
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typename raw_reference_tuple_helper<T7>::type, |
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typename raw_reference_tuple_helper<T8>::type, |
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typename raw_reference_tuple_helper<T9>::type |
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> type; |
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}; |
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template < |
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typename T0, typename T1, typename T2, |
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typename T3, typename T4, typename T5, |
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typename T6, typename T7, typename T8, |
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typename T9 |
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> |
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struct raw_reference_tuple_helper< |
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thrust::detail::tuple_of_iterator_references<T0,T1,T2,T3,T4,T5,T6,T7,T8,T9> |
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> |
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{ |
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typedef thrust::detail::tuple_of_iterator_references< |
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typename raw_reference_tuple_helper<T0>::type, |
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typename raw_reference_tuple_helper<T1>::type, |
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typename raw_reference_tuple_helper<T2>::type, |
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typename raw_reference_tuple_helper<T3>::type, |
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typename raw_reference_tuple_helper<T4>::type, |
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typename raw_reference_tuple_helper<T5>::type, |
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typename raw_reference_tuple_helper<T6>::type, |
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typename raw_reference_tuple_helper<T7>::type, |
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typename raw_reference_tuple_helper<T8>::type, |
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typename raw_reference_tuple_helper<T9>::type |
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> type; |
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}; |
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} // end raw_reference_detail |
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// if a tuple "tuple_type" is_unwrappable, |
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// then the raw_reference of tuple_type is a tuple of its members' raw_references |
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// else the raw_reference of tuple_type is tuple_type & |
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template < |
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typename T0, typename T1, typename T2, |
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typename T3, typename T4, typename T5, |
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typename T6, typename T7, typename T8, |
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typename T9 |
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> |
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struct raw_reference< |
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thrust::tuple<T0,T1,T2,T3,T4,T5,T6,T7,T8,T9> |
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> |
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{ |
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private: |
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typedef thrust::tuple<T0,T1,T2,T3,T4,T5,T6,T7,T8,T9> tuple_type; |
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public: |
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typedef typename eval_if< |
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is_unwrappable<tuple_type>::value, |
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raw_reference_detail::raw_reference_tuple_helper<tuple_type>, |
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add_reference<tuple_type> |
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>::type type; |
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}; |
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template < |
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typename T0, typename T1, typename T2, |
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typename T3, typename T4, typename T5, |
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typename T6, typename T7, typename T8, |
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typename T9 |
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> |
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struct raw_reference< |
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thrust::detail::tuple_of_iterator_references<T0,T1,T2,T3,T4,T5,T6,T7,T8,T9> |
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> |
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{ |
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private: |
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typedef detail::tuple_of_iterator_references<T0,T1,T2,T3,T4,T5,T6,T7,T8,T9> tuple_type; |
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public: |
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typedef typename raw_reference_detail::raw_reference_tuple_helper<tuple_type>::type type; |
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// XXX figure out why is_unwrappable seems to be broken for tuple_of_iterator_references |
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//typedef typename eval_if< |
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// is_unwrappable<tuple_type>::value, |
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// raw_reference_detail::raw_reference_tuple_helper<tuple_type>, |
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// add_reference<tuple_type> |
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//>::type type; |
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}; |
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struct raw_reference_caster |
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{ |
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template<typename T> |
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__host__ __device__ |
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typename detail::raw_reference<T>::type operator()(T &ref) |
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{ |
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return thrust::raw_reference_cast(ref); |
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} |
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template<typename T> |
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__host__ __device__ |
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typename detail::raw_reference<const T>::type operator()(const T &ref) |
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{ |
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return thrust::raw_reference_cast(ref); |
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} |
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template< |
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typename T0, typename T1, typename T2, |
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typename T3, typename T4, typename T5, |
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typename T6, typename T7, typename T8, |
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typename T9 |
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> |
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__host__ __device__ |
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typename detail::raw_reference< |
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thrust::detail::tuple_of_iterator_references<T0,T1,T2,T3,T4,T5,T6,T7,T8,T9> |
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>::type |
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operator()(thrust::detail::tuple_of_iterator_references<T0,T1,T2,T3,T4,T5,T6,T7,T8,T9> t, |
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typename enable_if< |
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is_unwrappable<thrust::detail::tuple_of_iterator_references<T0,T1,T2,T3,T4,T5,T6,T7,T8,T9> >::value |
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>::type * = 0) |
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{ |
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return thrust::raw_reference_cast(t); |
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} |
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}; // end raw_reference_caster |
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} // end detail |
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template< |
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typename T0, typename T1, typename T2, |
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typename T3, typename T4, typename T5, |
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typename T6, typename T7, typename T8, |
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typename T9 |
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> |
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__host__ __device__ |
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typename detail::enable_if_unwrappable< |
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thrust::detail::tuple_of_iterator_references<T0,T1,T2,T3,T4,T5,T6,T7,T8,T9>, |
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typename detail::raw_reference< |
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thrust::detail::tuple_of_iterator_references<T0,T1,T2,T3,T4,T5,T6,T7,T8,T9> |
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>::type |
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>::type |
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raw_reference_cast(thrust::detail::tuple_of_iterator_references<T0,T1,T2,T3,T4,T5,T6,T7,T8,T9> t) |
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{ |
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thrust::detail::raw_reference_caster f; |
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// note that we pass raw_reference_tuple_helper, not raw_reference as the unary metafunction |
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// the subtle difference is important |
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return thrust::detail::tuple_host_device_transform<detail::raw_reference_detail::raw_reference_tuple_helper>(t, f); |
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} // end raw_reference_cast |
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} // end thrust |
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