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142 lines
4.3 KiB
142 lines
4.3 KiB
![]()
11 years ago
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/*
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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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