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279 lines
9.9 KiB
279 lines
9.9 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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* * 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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/*! \file for_each.h
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* \brief Applies a function to each element in a range
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*/
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#pragma once
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#include <thrust/detail/config.h>
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#include <thrust/detail/type_traits.h>
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#include <thrust/detail/execution_policy.h>
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namespace thrust
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{
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/*! \addtogroup modifying
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* \ingroup transformations
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* \{
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*/
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/*! \p for_each applies the function object \p f to each element
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* in the range <tt>[first, last)</tt>; \p f's return value, if any,
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* is ignored. Unlike the C++ Standard Template Library function
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* <tt>std::for_each</tt>, this version offers no guarantee on
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* order of execution. For this reason, this version of \p for_each
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* does not return a copy of the function object.
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*
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* The algorithm's execution is parallelized as determined by \p exec.
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*
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* \param exec The execution policy to use for parallelization.
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* \param first The beginning of the sequence.
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* \param last The end of the sequence.
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* \param f The function object to apply to the range <tt>[first, last)</tt>.
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* \return last
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*
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* \tparam DerivedPolicy The name of the derived execution policy.
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* \tparam InputIterator is a model of <a href="http://www.sgi.com/tech/stl/InputIterator">Input Iterator</a>,
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* and \p InputIterator's \c value_type is convertible to \p UnaryFunction's \c argument_type.
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* \tparam UnaryFunction is a model of <a href="http://www.sgi.com/tech/stl/UnaryFunction">Unary Function</a>,
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* and \p UnaryFunction does not apply any non-constant operation through its argument.
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*
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* The following code snippet demonstrates how to use \p for_each to print the elements
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* of a \p std::device_vector using the \p thrust::device parallelization policy:
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*
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* \code
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* #include <thrust/for_each.h>
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* #include <thrust/device_vector.h>
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* #include <thrust/execution_policy.h>
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* #include <cstdio>
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* ...
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*
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* struct printf_functor
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* {
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* __host__ __device__
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* void operator()(int x)
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* {
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* // note that using printf in a __device__ function requires
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* // code compiled for a GPU with compute capability 2.0 or
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* // higher (nvcc --arch=sm_20)
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* printf("%d\n");
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* }
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* };
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* ...
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* thrust::device_vector<int> d_vec(3);
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* d_vec[0] = 0; d_vec[1] = 1; d_vec[2] = 2;
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*
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* thrust::for_each(thrust::device, d_vec.begin(), d_vec.end(), printf_functor());
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*
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* // 0 1 2 is printed to standard output in some unspecified order
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* \endcode
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*
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* \see for_each_n
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* \see http://www.sgi.com/tech/stl/for_each.html
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*/
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template<typename DerivedPolicy,
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typename InputIterator,
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typename UnaryFunction>
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InputIterator for_each(const thrust::detail::execution_policy_base<DerivedPolicy> &exec,
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InputIterator first,
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InputIterator last,
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UnaryFunction f);
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/*! \p for_each_n applies the function object \p f to each element
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* in the range <tt>[first, first + n)</tt>; \p f's return value, if any,
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* is ignored. Unlike the C++ Standard Template Library function
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* <tt>std::for_each</tt>, this version offers no guarantee on
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* order of execution.
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*
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* The algorithm's execution is parallelized as determined by \p exec.
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*
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* \param exec The execution policy to use for parallelization.
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* \param first The beginning of the sequence.
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* \param n The size of the input sequence.
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* \param f The function object to apply to the range <tt>[first, first + n)</tt>.
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* \return <tt>first + n</tt>
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*
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* \tparam DerivedPolicy The name of the derived execution policy.
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* \tparam InputIterator is a model of <a href="http://www.sgi.com/tech/stl/InputIterator">Input Iterator</a>,
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* and \p InputIterator's \c value_type is convertible to \p UnaryFunction's \c argument_type.
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* \tparam Size is an integral type.
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* \tparam UnaryFunction is a model of <a href="http://www.sgi.com/tech/stl/UnaryFunction">Unary Function</a>,
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* and \p UnaryFunction does not apply any non-constant operation through its argument.
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*
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* The following code snippet demonstrates how to use \p for_each_n to print the elements
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* of a \p device_vector using the \p thrust::device parallelization policy.
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*
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* \code
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* #include <thrust/for_each.h>
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* #include <thrust/device_vector.h>
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* #include <thrust/execution_policy.h>
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* #include <cstdio>
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*
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* struct printf_functor
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* {
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* __host__ __device__
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* void operator()(int x)
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* {
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* // note that using printf in a __device__ function requires
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* // code compiled for a GPU with compute capability 2.0 or
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* // higher (nvcc --arch=sm_20)
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* printf("%d\n");
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* }
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* };
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* ...
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* thrust::device_vector<int> d_vec(3);
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* d_vec[0] = 0; d_vec[1] = 1; d_vec[2] = 2;
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*
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* thrust::for_each_n(thrust::device, d_vec.begin(), d_vec.size(), printf_functor());
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*
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* // 0 1 2 is printed to standard output in some unspecified order
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* \endcode
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*
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* \see for_each
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* \see http://www.sgi.com/tech/stl/for_each.html
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*/
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template<typename DerivedPolicy,
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typename InputIterator,
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typename Size,
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typename UnaryFunction>
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InputIterator for_each_n(const thrust::detail::execution_policy_base<DerivedPolicy> &exec,
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InputIterator first,
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Size n,
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UnaryFunction f);
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/*! \p for_each applies the function object \p f to each element
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* in the range <tt>[first, last)</tt>; \p f's return value, if any,
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* is ignored. Unlike the C++ Standard Template Library function
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* <tt>std::for_each</tt>, this version offers no guarantee on
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* order of execution. For this reason, this version of \p for_each
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* does not return a copy of the function object.
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*
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* \param first The beginning of the sequence.
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* \param last The end of the sequence.
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* \param f The function object to apply to the range <tt>[first, last)</tt>.
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* \return last
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*
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* \tparam InputIterator is a model of <a href="http://www.sgi.com/tech/stl/InputIterator">Input Iterator</a>,
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* and \p InputIterator's \c value_type is convertible to \p UnaryFunction's \c argument_type.
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* \tparam UnaryFunction is a model of <a href="http://www.sgi.com/tech/stl/UnaryFunction">Unary Function</a>,
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* and \p UnaryFunction does not apply any non-constant operation through its argument.
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*
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* The following code snippet demonstrates how to use \p for_each to print the elements
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* of a \p device_vector.
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*
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* \code
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* #include <thrust/for_each.h>
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* #include <thrust/device_vector.h>
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* #include <stdio.h>
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*
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* struct printf_functor
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* {
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* __host__ __device__
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* void operator()(int x)
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* {
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* // note that using printf in a __device__ function requires
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* // code compiled for a GPU with compute capability 2.0 or
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* // higher (nvcc --arch=sm_20)
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* printf("%d\n");
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* }
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* };
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* ...
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* thrust::device_vector<int> d_vec(3);
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* d_vec[0] = 0; d_vec[1] = 1; d_vec[2] = 2;
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*
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* thrust::for_each(d_vec.begin(), d_vec.end(), printf_functor());
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*
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* // 0 1 2 is printed to standard output in some unspecified order
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* \endcode
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*
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* \see for_each_n
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* \see http://www.sgi.com/tech/stl/for_each.html
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*/
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template<typename InputIterator,
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typename UnaryFunction>
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InputIterator for_each(InputIterator first,
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InputIterator last,
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UnaryFunction f);
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/*! \p for_each_n applies the function object \p f to each element
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* in the range <tt>[first, first + n)</tt>; \p f's return value, if any,
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* is ignored. Unlike the C++ Standard Template Library function
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* <tt>std::for_each</tt>, this version offers no guarantee on
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* order of execution.
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*
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* \param first The beginning of the sequence.
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* \param n The size of the input sequence.
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* \param f The function object to apply to the range <tt>[first, first + n)</tt>.
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* \return <tt>first + n</tt>
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*
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* \tparam InputIterator is a model of <a href="http://www.sgi.com/tech/stl/InputIterator">Input Iterator</a>,
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* and \p InputIterator's \c value_type is convertible to \p UnaryFunction's \c argument_type.
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* \tparam Size is an integral type.
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* \tparam UnaryFunction is a model of <a href="http://www.sgi.com/tech/stl/UnaryFunction">Unary Function</a>,
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* and \p UnaryFunction does not apply any non-constant operation through its argument.
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*
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* The following code snippet demonstrates how to use \p for_each_n to print the elements
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* of a \p device_vector.
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*
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* \code
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* #include <thrust/for_each.h>
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* #include <thrust/device_vector.h>
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* #include <stdio.h>
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*
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* struct printf_functor
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* {
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* __host__ __device__
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* void operator()(int x)
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* {
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* // note that using printf in a __device__ function requires
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* // code compiled for a GPU with compute capability 2.0 or
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* // higher (nvcc --arch=sm_20)
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* printf("%d\n");
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* }
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* };
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* ...
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* thrust::device_vector<int> d_vec(3);
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* d_vec[0] = 0; d_vec[1] = 1; d_vec[2] = 2;
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*
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* thrust::for_each_n(d_vec.begin(), d_vec.size(), printf_functor());
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*
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* // 0 1 2 is printed to standard output in some unspecified order
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* \endcode
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*
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* \see for_each
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* \see http://www.sgi.com/tech/stl/for_each.html
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*/
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template<typename InputIterator,
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typename Size,
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typename UnaryFunction>
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InputIterator for_each_n(InputIterator first,
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Size n,
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UnaryFunction f);
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/*! \} // end modifying
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*/
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} // end namespace thrust
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#include <thrust/detail/for_each.inl>
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