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141 lines
4.3 KiB
141 lines
4.3 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/iterator/counting_iterator.h> |
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#include <thrust/iterator/iterator_traits.h> |
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#include <thrust/detail/numeric_traits.h> |
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#include <thrust/detail/type_traits.h> |
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#include <cstddef> |
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namespace thrust |
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{ |
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// forward declaration of counting_iterator |
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template <typename Incrementable, typename System, typename Traversal, typename Difference> |
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class counting_iterator; |
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namespace detail |
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{ |
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template <typename Incrementable, typename System, typename Traversal, typename Difference> |
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struct counting_iterator_base |
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{ |
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typedef typename thrust::detail::eval_if< |
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// use any_system_tag if we are given use_default |
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thrust::detail::is_same<System,use_default>::value, |
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thrust::detail::identity_<thrust::any_system_tag>, |
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thrust::detail::identity_<System> |
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>::type system; |
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typedef typename thrust::detail::ia_dflt_help< |
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Traversal, |
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thrust::detail::eval_if< |
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thrust::detail::is_numeric<Incrementable>::value, |
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thrust::detail::identity_<random_access_traversal_tag>, |
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thrust::iterator_traversal<Incrementable> |
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> |
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>::type traversal; |
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// unlike Boost, we explicitly use std::ptrdiff_t as the difference type |
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// for floating point counting_iterators |
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typedef typename thrust::detail::ia_dflt_help< |
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Difference, |
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thrust::detail::eval_if< |
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thrust::detail::is_numeric<Incrementable>::value, |
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thrust::detail::eval_if< |
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thrust::detail::is_integral<Incrementable>::value, |
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thrust::detail::numeric_difference<Incrementable>, |
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thrust::detail::identity_<std::ptrdiff_t> |
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>, |
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thrust::iterator_difference<Incrementable> |
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> |
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>::type difference; |
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// our implementation departs from Boost's in that counting_iterator::dereference |
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// returns a copy of its counter, rather than a reference to it. returning a reference |
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// to the internal state of an iterator causes subtle bugs (consider the temporary |
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// iterator created in the expression *(iter + i) ) and has no compelling use case |
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typedef thrust::iterator_adaptor< |
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counting_iterator<Incrementable, System, Traversal, Difference>, // self |
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Incrementable, // Base |
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Incrementable, // XXX we may need to pass const here as Boost does |
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system, |
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traversal, |
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Incrementable, |
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difference |
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> type; |
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}; // end counting_iterator_base |
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template<typename Difference, typename Incrementable1, typename Incrementable2> |
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struct iterator_distance |
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{ |
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__host__ __device__ |
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static Difference distance(Incrementable1 x, Incrementable2 y) |
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{ |
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return y - x; |
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} |
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}; |
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template<typename Difference, typename Incrementable1, typename Incrementable2> |
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struct number_distance |
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{ |
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__host__ __device__ |
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static Difference distance(Incrementable1 x, Incrementable2 y) |
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{ |
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return static_cast<Difference>(numeric_distance(x,y)); |
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} |
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}; |
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template<typename Difference, typename Incrementable1, typename Incrementable2, typename Enable = void> |
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struct counting_iterator_equal |
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{ |
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__host__ __device__ |
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static bool equal(Incrementable1 x, Incrementable2 y) |
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{ |
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return x == y; |
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} |
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}; |
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// specialization for floating point equality |
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template<typename Difference, typename Incrementable1, typename Incrementable2> |
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struct counting_iterator_equal< |
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Difference, |
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Incrementable1, |
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Incrementable2, |
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typename thrust::detail::enable_if< |
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thrust::detail::is_floating_point<Incrementable1>::value || |
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thrust::detail::is_floating_point<Incrementable2>::value |
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>::type |
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> |
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{ |
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__host__ __device__ |
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static bool equal(Incrementable1 x, Incrementable2 y) |
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{ |
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typedef number_distance<Difference,Incrementable1,Incrementable2> d; |
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return d::distance(x,y) == 0; |
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} |
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}; |
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} // end detail |
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} // end thrust |
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