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57 lines
1.6 KiB
57 lines
1.6 KiB
8 years ago
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/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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#pragma once
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#ifndef __NVCC__
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#error device_ptr_cast must be include by .cu file
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#endif
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#include <thrust/device_ptr.h>
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namespace paddle {
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namespace platform {
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namespace details {
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template <typename T, bool is_ptr>
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struct DevicePtrCast;
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template <typename T>
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struct DevicePtrCast<T, true> {
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using ELEM = typename std::remove_pointer<T>::type;
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using RTYPE = thrust::device_ptr<ELEM>;
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inline thrust::device_ptr<ELEM> operator()(ELEM* ele) const {
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return thrust::device_pointer_cast(ele);
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}
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};
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template <typename T>
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struct DevicePtrCast<T, false> {
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using RTYPE = T;
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inline RTYPE operator()(RTYPE it) const { return it; }
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};
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// Cast T to thrust::device_ptr if T is a pointer.
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// Otherwise, e.g., T is a iterator, return T itself.
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template <typename T>
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auto DevPtrCast(T t) ->
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typename DevicePtrCast<T, std::is_pointer<T>::value>::RTYPE {
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DevicePtrCast<T, std::is_pointer<T>::value> cast;
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return cast(t);
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}
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} // namespace details
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} // namespace platform
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} // namespace paddle
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