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76 lines
1.6 KiB
76 lines
1.6 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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// Portions of this code are derived from
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//
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// Manjunath Kudlur's Carbon library
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//
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// and
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//
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// Based on Boost.Phoenix v1.2
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// Copyright (c) 2001-2002 Joel de Guzman
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#pragma once
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#include <thrust/detail/config.h>
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#include <thrust/tuple.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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namespace functional
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{
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template<unsigned int i, typename Env>
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struct argument_helper
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{
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typedef typename thrust::tuple_element<i,Env>::type type;
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};
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template<unsigned int i>
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struct argument_helper<i,thrust::null_type>
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{
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typedef thrust::null_type type;
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};
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template<unsigned int i>
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class argument
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{
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public:
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template<typename Env>
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struct result
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: argument_helper<i,Env>
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{
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};
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__host__ __device__
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argument(void){}
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template<typename Env>
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__host__ __device__
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typename result<Env>::type eval(const Env &e) const
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{
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return thrust::get<i>(e);
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} // end eval()
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}; // end argument
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} // end functional
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} // end detail
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} // end thrust
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