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158 lines
4.2 KiB
158 lines
4.2 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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#include <thrust/detail/allocator/destroy_range.h> |
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#include <thrust/detail/allocator/allocator_traits.h> |
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#include <thrust/detail/type_traits/pointer_traits.h> |
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#include <thrust/for_each.h> |
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#include <memory> |
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namespace thrust |
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{ |
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namespace detail |
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{ |
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namespace allocator_traits_detail |
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{ |
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// destroy_range has three cases: |
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// if Allocator has an effectful member function destroy: |
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// 1. destroy via the allocator |
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// else |
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// 2. if T has a non-trivial destructor, destroy the range without using the allocator |
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// 3. if T has a trivial destructor, do a no-op |
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template<typename Allocator, typename T> |
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struct has_effectful_member_destroy |
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: has_member_destroy<Allocator,T> |
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{}; |
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// std::allocator::destroy's only effect is to invoke its argument's destructor |
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template<typename U, typename T> |
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struct has_effectful_member_destroy<std::allocator<U>, T> |
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: thrust::detail::false_type |
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{}; |
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// case 1: Allocator has an effectful 1-argument member function "destroy" |
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template<typename Allocator, typename Pointer> |
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struct enable_if_destroy_range_case1 |
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: thrust::detail::enable_if< |
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has_effectful_member_destroy< |
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Allocator, |
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typename pointer_element<Pointer>::type |
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>::value |
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> |
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{}; |
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// case 2: Allocator has no member function "destroy", but T has a non-trivial destructor |
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template<typename Allocator, typename Pointer> |
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struct enable_if_destroy_range_case2 |
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: thrust::detail::enable_if< |
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!has_effectful_member_destroy< |
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Allocator, |
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typename pointer_element<Pointer>::type |
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>::value && |
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!has_trivial_destructor< |
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typename pointer_element<Pointer>::type |
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>::value |
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> |
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{}; |
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// case 3: Allocator has no member function "destroy", and T has a trivial destructor |
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template<typename Allocator, typename Pointer> |
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struct enable_if_destroy_range_case3 |
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: thrust::detail::enable_if< |
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!has_effectful_member_destroy< |
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Allocator, |
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typename pointer_element<Pointer>::type |
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>::value && |
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has_trivial_destructor< |
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typename pointer_element<Pointer>::type |
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>::value |
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> |
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{}; |
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template<typename Allocator> |
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struct destroy_via_allocator |
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{ |
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Allocator &a; |
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destroy_via_allocator(Allocator &a) |
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: a(a) |
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{} |
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template<typename T> |
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inline __host__ __device__ |
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void operator()(T &x) |
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{ |
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allocator_traits<Allocator>::destroy(a, &x); |
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} |
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}; |
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// destroy_range case 1: destroy via allocator |
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template<typename Allocator, typename Pointer, typename Size> |
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typename enable_if_destroy_range_case1<Allocator,Pointer>::type |
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destroy_range(Allocator &a, Pointer p, Size n) |
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{ |
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thrust::for_each_n(allocator_system<Allocator>::get(a), p, n, destroy_via_allocator<Allocator>(a)); |
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} |
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// we must prepare for His coming |
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struct gozer |
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{ |
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template<typename T> |
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inline __host__ __device__ |
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void operator()(T &x) |
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{ |
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x.~T(); |
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} |
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}; |
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// destroy_range case 2: destroy without the allocator |
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template<typename Allocator, typename Pointer, typename Size> |
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typename enable_if_destroy_range_case2<Allocator,Pointer>::type |
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destroy_range(Allocator &a, Pointer p, Size n) |
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{ |
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thrust::for_each_n(allocator_system<Allocator>::get(a), p, n, gozer()); |
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} |
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// destroy_range case 3: no-op |
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template<typename Allocator, typename Pointer, typename Size> |
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typename enable_if_destroy_range_case3<Allocator,Pointer>::type |
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destroy_range(Allocator &, Pointer, Size) |
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{ |
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// no op |
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} |
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} // end allocator_traits_detail |
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template<typename Allocator, typename Pointer, typename Size> |
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void destroy_range(Allocator &a, Pointer p, Size n) |
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{ |
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return allocator_traits_detail::destroy_range(a,p,n); |
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} |
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} // end detail |
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} // end thrust |
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