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1079 lines
37 KiB
1079 lines
37 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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/*! \file functional.h |
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* \brief Function objects and tools for manipulating them |
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*/ |
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#pragma once |
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#include <thrust/detail/config.h> |
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#include <functional> |
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#include <thrust/detail/functional/placeholder.h> |
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namespace thrust |
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{ |
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/*! \addtogroup function_objects Function Objects |
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*/ |
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template<typename Operation> struct unary_traits; |
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template<typename Operation> struct binary_traits; |
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/*! \addtogroup function_object_adaptors Function Object Adaptors |
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* \ingroup function_objects |
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* \{ |
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*/ |
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/*! \p unary_function is an empty base class: it contains no member functions |
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* or member variables, but only type information. The only reason it exists |
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* is to make it more convenient to define types that are models of the |
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* concept Adaptable Unary Function. Specifically, any model of Adaptable |
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* Unary Function must define nested \c typedefs. Those \c typedefs are |
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* provided by the base class \p unary_function. |
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* |
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* The following code snippet demonstrates how to construct an |
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* Adaptable Unary Function using \p unary_function. |
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* |
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* \code |
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* struct sine : public thrust::unary_function<float,float> |
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* { |
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* __host__ __device__ |
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* float operator()(float x) { return sinf(x); } |
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* }; |
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* \endcode |
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* |
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* \note unary_function is currently redundant with the C++ STL type |
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* \c std::unary_function. We reserve it here for potential additional |
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* functionality at a later date. |
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* |
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* \see http://www.sgi.com/tech/stl/unary_function.html |
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* \see binary_function |
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*/ |
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template<typename Argument, |
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typename Result> |
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struct unary_function |
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: public std::unary_function<Argument, Result> |
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{ |
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}; // end unary_function |
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/*! \p binary_function is an empty base class: it contains no member functions |
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* or member variables, but only type information. The only reason it exists |
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* is to make it more convenient to define types that are models of the |
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* concept Adaptable Binary Function. Specifically, any model of Adaptable |
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* Binary Function must define nested \c typedefs. Those \c typedefs are |
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* provided by the base class \p binary_function. |
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* |
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* The following code snippet demonstrates how to construct an |
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* Adaptable Binary Function using \p binary_function. |
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* |
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* \code |
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* struct exponentiate : public thrust::binary_function<float,float,float> |
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* { |
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* __host__ __device__ |
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* float operator()(float x, float y) { return powf(x,y); } |
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* }; |
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* \endcode |
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* |
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* \note binary_function is currently redundant with the C++ STL type |
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* \c std::binary_function. We reserve it here for potential additional |
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* functionality at a later date. |
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* |
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* \see http://www.sgi.com/tech/stl/binary_function.html |
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* \see unary_function |
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*/ |
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template<typename Argument1, |
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typename Argument2, |
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typename Result> |
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struct binary_function |
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: public std::binary_function<Argument1, Argument2, Result> |
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{ |
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}; // end binary_function |
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/*! \} |
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*/ |
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/*! \addtogroup predefined_function_objects Predefined Function Objects |
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* \ingroup function_objects |
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*/ |
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/*! \addtogroup arithmetic_operations Arithmetic Operations |
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* \ingroup predefined_function_objects |
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* \{ |
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*/ |
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/*! \p plus is a function object. Specifically, it is an Adaptable Binary Function. |
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* If \c f is an object of class <tt>plus<T></tt>, and \c x and \c y are objects |
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* of class \c T, then <tt>f(x,y)</tt> returns <tt>x+y</tt>. |
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* |
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* \tparam T is a model of <a href="http://www.sgi.com/tech/stl/Assignable.html">Assignable</a>, |
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* and if \c x and \c y are objects of type \p T, then <tt>x+y</tt> must be defined and must have a return type that is convertible to \c T. |
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* |
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* The following code snippet demonstrates how to use <tt>plus</tt> to sum two |
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* device_vectors of \c floats. |
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* |
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* \code |
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* #include <thrust/device_vector.h> |
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* #include <thrust/functional.h> |
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* #include <thrust/sequence.h> |
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* #include <thrust/fill.h> |
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* #include <thrust/transform.h> |
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* ... |
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* const int N = 1000; |
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* thrust::device_vector<float> V1(N); |
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* thrust::device_vector<float> V2(N); |
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* thrust::device_vector<float> V3(N); |
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* |
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* thrust::sequence(V1.begin(), V1.end(), 1); |
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* thrust::fill(V2.begin(), V2.end(), 75); |
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* |
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* thrust::transform(V1.begin(), V1.end(), V2.begin(), V3.begin(), |
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* thrust::plus<float>()); |
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* // V3 is now {76, 77, 78, ..., 1075} |
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* \endcode |
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* |
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* \see http://www.sgi.com/tech/stl/plus.html |
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* \see binary_function |
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*/ |
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template<typename T> |
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struct plus : public binary_function<T,T,T> |
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{ |
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/*! Function call operator. The return value is <tt>lhs + rhs</tt>. |
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*/ |
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__host__ __device__ T operator()(const T &lhs, const T &rhs) const {return lhs + rhs;} |
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}; // end plus |
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/*! \p minus is a function object. Specifically, it is an Adaptable Binary Function. |
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* If \c f is an object of class <tt>minus<T></tt>, and \c x and \c y are objects |
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* of class \c T, then <tt>f(x,y)</tt> returns <tt>x-y</tt>. |
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* |
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* \tparam T is a model of <a href="http://www.sgi.com/tech/stl/Assignable.html">Assignable</a>, |
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* and if \c x and \c y are objects of type \p T, then <tt>x-y</tt> must be defined and must have a return type that is convertible to \c T. |
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* |
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* The following code snippet demonstrates how to use <tt>minus</tt> to subtract |
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* a device_vector of \c floats from another. |
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* |
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* \code |
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* #include <thrust/device_vector.h> |
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* #include <thrust/functional.h> |
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* #include <thrust/sequence.h> |
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* #include <thrust/fill.h> |
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* #include <thrust/transform.h> |
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* ... |
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* const int N = 1000; |
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* thrust::device_vector<float> V1(N); |
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* thrust::device_vector<float> V2(N); |
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* thrust::device_vector<float> V3(N); |
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* |
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* thrust::sequence(V1.begin(), V1.end(), 1); |
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* thrust::fill(V2.begin(), V2.end(), 75); |
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* |
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* thrust::transform(V1.begin(), V1.end(), V2.begin(), V3.begin(), |
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* thrust::minus<float>()); |
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* // V3 is now {-74, -75, -76, ..., -925} |
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* \endcode |
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* |
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* \see http://www.sgi.com/tech/stl/minus.html |
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* \see binary_function |
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*/ |
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template<typename T> |
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struct minus : public binary_function<T,T,T> |
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{ |
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/*! Function call operator. The return value is <tt>lhs - rhs</tt>. |
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*/ |
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__host__ __device__ T operator()(const T &lhs, const T &rhs) const {return lhs - rhs;} |
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}; // end minus |
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/*! \p multiplies is a function object. Specifically, it is an Adaptable Binary Function. |
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* If \c f is an object of class <tt>minus<T></tt>, and \c x and \c y are objects |
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* of class \c T, then <tt>f(x,y)</tt> returns <tt>x*y</tt>. |
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* |
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* \tparam T is a model of <a href="http://www.sgi.com/tech/stl/Assignable.html">Assignable</a>, |
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* and if \c x and \c y are objects of type \p T, then <tt>x*y</tt> must be defined and must have a return type that is convertible to \c T. |
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* |
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* The following code snippet demonstrates how to use <tt>multiplies</tt> to multiply |
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* two device_vectors of \c floats. |
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* |
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* \code |
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* #include <thrust/device_vector.h> |
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* #include <thrust/functional.h> |
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* #include <thrust/sequence.h> |
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* #include <thrust/fill.h> |
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* #include <thrust/transform.h> |
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* ... |
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* const int N = 1000; |
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* thrust::device_vector<float> V1(N); |
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* thrust::device_vector<float> V2(N); |
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* thrust::device_vector<float> V3(N); |
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* |
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* thrust::sequence(V1.begin(), V1.end(), 1); |
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* thrust::fill(V2.begin(), V2.end(), 75); |
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* |
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* thrust::transform(V1.begin(), V1.end(), V2.begin(), V3.begin(), |
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* thrust::multiplies<float>()); |
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* // V3 is now {75, 150, 225, ..., 75000} |
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* \endcode |
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* |
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* \see http://www.sgi.com/tech/stl/multiplies.html |
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* \see binary_function |
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*/ |
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template<typename T> |
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struct multiplies : public binary_function<T,T,T> |
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{ |
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/*! Function call operator. The return value is <tt>lhs * rhs</tt>. |
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*/ |
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__host__ __device__ T operator()(const T &lhs, const T &rhs) const {return lhs * rhs;} |
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}; // end multiplies |
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/*! \p divides is a function object. Specifically, it is an Adaptable Binary Function. |
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* If \c f is an object of class <tt>divides<T></tt>, and \c x and \c y are objects |
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* of class \c T, then <tt>f(x,y)</tt> returns <tt>x/y</tt>. |
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* |
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* \tparam T is a model of <a href="http://www.sgi.com/tech/stl/Assignable.html">Assignable</a>, |
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* and if \c x and \c y are objects of type \p T, then <tt>x/y</tt> must be defined and must have a return type that is convertible to \c T. |
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* |
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* The following code snippet demonstrates how to use <tt>divides</tt> to divide |
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* one device_vectors of \c floats by another. |
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* |
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* \code |
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* #include <thrust/device_vector.h> |
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* #include <thrust/functional.h> |
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* #include <thrust/sequence.h> |
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* #include <thrust/fill.h> |
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* #include <thrust/transform.h> |
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* ... |
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* const int N = 1000; |
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* thrust::device_vector<float> V1(N); |
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* thrust::device_vector<float> V2(N); |
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* thrust::device_vector<float> V3(N); |
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* |
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* thrust::sequence(V1.begin(), V1.end(), 1); |
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* thrust::fill(V2.begin(), V2.end(), 75); |
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* |
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* thrust::transform(V1.begin(), V1.end(), V2.begin(), V3.begin(), |
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* thrust::divides<float>()); |
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* // V3 is now {1/75, 2/75, 3/75, ..., 1000/75} |
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* \endcode |
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* |
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* \see http://www.sgi.com/tech/stl/divides.html |
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* \see binary_function |
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*/ |
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template<typename T> |
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struct divides : public binary_function<T,T,T> |
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{ |
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/*! Function call operator. The return value is <tt>lhs / rhs</tt>. |
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*/ |
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__host__ __device__ T operator()(const T &lhs, const T &rhs) const {return lhs / rhs;} |
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}; // end divides |
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/*! \p modulus is a function object. Specifically, it is an Adaptable Binary Function. |
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* If \c f is an object of class <tt>divides<T></tt>, and \c x and \c y are objects |
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* of class \c T, then <tt>f(x,y)</tt> returns <tt>x%y</tt>. |
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* |
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* \tparam T is a model of <a href="http://www.sgi.com/tech/stl/Assignable.html">Assignable</a>, |
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* and if \c x and \c y are objects of type \p T, then <tt>x%y</tt> must be defined and must have a return type that is convertible to \c T. |
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* |
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* The following code snippet demonstrates how to use <tt>modulus</tt> to take |
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* the modulus of one device_vectors of \c floats by another. |
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* |
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* \code |
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* #include <thrust/device_vector.h> |
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* #include <thrust/functional.h> |
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* #include <thrust/sequence.h> |
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* #include <thrust/fill.h> |
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* #include <thrust/transform.h> |
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* ... |
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* const int N = 1000; |
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* thrust::device_vector<float> V1(N); |
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* thrust::device_vector<float> V2(N); |
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* thrust::device_vector<float> V3(N); |
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* |
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* thrust::sequence(V1.begin(), V1.end(), 1); |
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* thrust::fill(V2.begin(), V2.end(), 75); |
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* |
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* thrust::transform(V1.begin(), V1.end(), V2.begin(), V3.begin(), |
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* thrust::modulus<int>()); |
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* // V3 is now {1%75, 2%75, 3%75, ..., 1000%75} |
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* \endcode |
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* |
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* \see http://www.sgi.com/tech/stl/modulus.html |
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* \see binary_function |
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*/ |
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template<typename T> |
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struct modulus : public binary_function<T,T,T> |
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{ |
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/*! Function call operator. The return value is <tt>lhs % rhs</tt>. |
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*/ |
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__host__ __device__ T operator()(const T &lhs, const T &rhs) const {return lhs % rhs;} |
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}; // end modulus |
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/*! \p negate is a function object. Specifically, it is an Adaptable Unary Function. |
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* If \c f is an object of class <tt>negate<T></tt>, and \c x is an object |
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* of class \c T, then <tt>f(x)</tt> returns <tt>-x</tt>. |
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* |
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* \tparam T is a model of <a href="http://www.sgi.com/tech/stl/Assignable.html">Assignable</a>, |
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* and if \c x is an object of type \p T, then <tt>-x</tt> must be defined and must have a return type that is convertible to \c T. |
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* |
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* The following code snippet demonstrates how to use <tt>negate</tt> to negate |
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* the element of a device_vector of \c floats. |
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* |
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* \code |
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* #include <thrust/device_vector.h> |
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* #include <thrust/functional.h> |
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* #include <thrust/sequence.h> |
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* #include <thrust/transform.h> |
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* ... |
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* const int N = 1000; |
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* thrust::device_vector<float> V1(N); |
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* thrust::device_vector<float> V2(N); |
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* |
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* thrust::sequence(V1.begin(), V1.end(), 1); |
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* |
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* thrust::transform(V1.begin(), V1.end(), V2.begin(), |
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* thrust::negate<float>()); |
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* // V2 is now {-1, -2, -3, ..., -1000} |
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* \endcode |
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* |
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* \see http://www.sgi.com/tech/stl/negate.html |
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* \see unary_function |
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*/ |
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template<typename T> |
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struct negate : public unary_function<T,T> |
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{ |
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/*! Function call operator. The return value is <tt>-x</tt>. |
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*/ |
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__host__ __device__ T operator()(const T &x) const {return -x;} |
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}; // end negate |
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/*! \} |
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*/ |
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/*! \addtogroup comparison_operations Comparison Operations |
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* \ingroup predefined_function_objects |
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* \{ |
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*/ |
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/*! \p equal_to is a function object. Specifically, it is an Adaptable Binary |
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* Predicate, which means it is a function object that tests the truth or falsehood |
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* of some condition. If \c f is an object of class <tt>equal_to<T></tt> and \c x |
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* and \c y are objects of class \c T, then <tt>f(x,y)</tt> returns \c true if |
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* <tt>x == y</tt> and \c false otherwise. |
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* |
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* \tparam T is a model of <a href="http://www.sgi.com/tech/stl/EqualityComparable.html">Equality Comparable</a>. |
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* |
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* \see http://www.sgi.com/tech/stl/equal_to.html |
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* \see binary_function |
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*/ |
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template<typename T> |
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struct equal_to : public binary_function<T,T,bool> |
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{ |
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/*! Function call operator. The return value is <tt>lhs == rhs</tt>. |
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*/ |
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__host__ __device__ bool operator()(const T &lhs, const T &rhs) const {return lhs == rhs;} |
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}; // end equal_to |
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/*! \p not_equal_to is a function object. Specifically, it is an Adaptable Binary |
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* Predicate, which means it is a function object that tests the truth or falsehood |
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* of some condition. If \c f is an object of class <tt>not_equal_to<T></tt> and \c x |
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* and \c y are objects of class \c T, then <tt>f(x,y)</tt> returns \c true if |
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* <tt>x != y</tt> and \c false otherwise. |
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* |
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* \tparam T is a model of <a href="http://www.sgi.com/tech/stl/EqualityComparable.html">Equality Comparable</a>. |
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* |
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* \see http://www.sgi.com/tech/stl/not_equal_to.html |
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* \see binary_function |
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*/ |
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template<typename T> |
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struct not_equal_to : public binary_function<T,T,bool> |
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{ |
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/*! Function call operator. The return value is <tt>lhs != rhs</tt>. |
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*/ |
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__host__ __device__ bool operator()(const T &lhs, const T &rhs) const {return lhs != rhs;} |
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}; // end not_equal_to |
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|
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/*! \p greater is a function object. Specifically, it is an Adaptable Binary |
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* Predicate, which means it is a function object that tests the truth or falsehood |
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* of some condition. If \c f is an object of class <tt>greater<T></tt> and \c x |
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* and \c y are objects of class \c T, then <tt>f(x,y)</tt> returns \c true if |
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* <tt>x > y</tt> and \c false otherwise. |
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* |
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* \tparam T is a model of <a href="http://www.sgi.com/tech/stl/LessThanComparable.html">LessThan Comparable</a>. |
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* |
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* \see http://www.sgi.com/tech/stl/greater.html |
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* \see binary_function |
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*/ |
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template<typename T> |
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struct greater : public binary_function<T,T,bool> |
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{ |
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/*! Function call operator. The return value is <tt>lhs > rhs</tt>. |
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*/ |
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__host__ __device__ bool operator()(const T &lhs, const T &rhs) const {return lhs > rhs;} |
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}; // end greater |
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|
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/*! \p less is a function object. Specifically, it is an Adaptable Binary |
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* Predicate, which means it is a function object that tests the truth or falsehood |
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* of some condition. If \c f is an object of class <tt>less<T></tt> and \c x |
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* and \c y are objects of class \c T, then <tt>f(x,y)</tt> returns \c true if |
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* <tt>x < y</tt> and \c false otherwise. |
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* |
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* \tparam T is a model of <a href="http://www.sgi.com/tech/stl/LessThanComparable.html">LessThan Comparable</a>. |
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* |
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* \see http://www.sgi.com/tech/stl/less.html |
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* \see binary_function |
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*/ |
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template<typename T> |
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struct less : public binary_function<T,T,bool> |
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{ |
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/*! Function call operator. The return value is <tt>lhs < rhs</tt>. |
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*/ |
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__host__ __device__ bool operator()(const T &lhs, const T &rhs) const {return lhs < rhs;} |
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}; // end less |
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|
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/*! \p greater_equal is a function object. Specifically, it is an Adaptable Binary |
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* Predicate, which means it is a function object that tests the truth or falsehood |
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* of some condition. If \c f is an object of class <tt>greater_equal<T></tt> and \c x |
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* and \c y are objects of class \c T, then <tt>f(x,y)</tt> returns \c true if |
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* <tt>x >= y</tt> and \c false otherwise. |
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* |
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* \tparam T is a model of <a href="http://www.sgi.com/tech/stl/LessThanComparable.html">LessThan Comparable</a>. |
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* |
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* \see http://www.sgi.com/tech/stl/greater_equal.html |
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* \see binary_function |
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*/ |
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template<typename T> |
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struct greater_equal : public binary_function<T,T,bool> |
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{ |
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/*! Function call operator. The return value is <tt>lhs >= rhs</tt>. |
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*/ |
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__host__ __device__ bool operator()(const T &lhs, const T &rhs) const {return lhs >= rhs;} |
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}; // end greater_equal |
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|
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/*! \p less_equal is a function object. Specifically, it is an Adaptable Binary |
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* Predicate, which means it is a function object that tests the truth or falsehood |
|
* of some condition. If \c f is an object of class <tt>less_equal<T></tt> and \c x |
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* and \c y are objects of class \c T, then <tt>f(x,y)</tt> returns \c true if |
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* <tt>x <= y</tt> and \c false otherwise. |
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* |
|
* \tparam T is a model of <a href="http://www.sgi.com/tech/stl/LessThanComparable.html">LessThan Comparable</a>. |
|
* |
|
* \see http://www.sgi.com/tech/stl/less_equal.html |
|
* \see binary_function |
|
*/ |
|
template<typename T> |
|
struct less_equal : public binary_function<T,T,bool> |
|
{ |
|
/*! Function call operator. The return value is <tt>lhs <= rhs</tt>. |
|
*/ |
|
__host__ __device__ bool operator()(const T &lhs, const T &rhs) const {return lhs <= rhs;} |
|
}; // end less_equal |
|
|
|
/*! \} |
|
*/ |
|
|
|
|
|
/*! \addtogroup logical_operations Logical Operations |
|
* \ingroup predefined_function_objects |
|
* \{ |
|
*/ |
|
|
|
/*! \p logical_and is a function object. Specifically, it is an Adaptable Binary Predicate, |
|
* which means it is a function object that tests the truth or falsehood of some condition. |
|
* If \c f is an object of class <tt>logical_and<T></tt> and \c x and \c y are objects of |
|
* class \c T (where \c T is convertible to \c bool) then <tt>f(x,y)</tt> returns \c true |
|
* if and only if both \c x and \c y are \c true. |
|
* |
|
* \tparam T must be convertible to \c bool. |
|
* |
|
* \see http://www.sgi.com/tech/stl/logical_and.html |
|
* \see binary_function |
|
*/ |
|
template<typename T> |
|
struct logical_and : public binary_function<T,T,bool> |
|
{ |
|
/*! Function call operator. The return value is <tt>lhs && rhs</tt>. |
|
*/ |
|
__host__ __device__ bool operator()(const T &lhs, const T &rhs) const {return lhs && rhs;} |
|
}; // end logical_and |
|
|
|
/*! \p logical_or is a function object. Specifically, it is an Adaptable Binary Predicate, |
|
* which means it is a function object that tests the truth or falsehood of some condition. |
|
* If \c f is an object of class <tt>logical_or<T></tt> and \c x and \c y are objects of |
|
* class \c T (where \c T is convertible to \c bool) then <tt>f(x,y)</tt> returns \c true |
|
* if and only if either \c x or \c y are \c true. |
|
* |
|
* \tparam T must be convertible to \c bool. |
|
* |
|
* \see http://www.sgi.com/tech/stl/logical_or.html |
|
* \see binary_function |
|
*/ |
|
template<typename T> |
|
struct logical_or : public binary_function<T,T,bool> |
|
{ |
|
/*! Function call operator. The return value is <tt>lhs || rhs</tt>. |
|
*/ |
|
__host__ __device__ bool operator()(const T &lhs, const T &rhs) const {return lhs || rhs;} |
|
}; // end logical_or |
|
|
|
/*! \p logical_not is a function object. Specifically, it is an Adaptable Predicate, |
|
* which means it is a function object that tests the truth or falsehood of some condition. |
|
* If \c f is an object of class <tt>logical_not<T></tt> and \c x is an object of |
|
* class \c T (where \c T is convertible to \c bool) then <tt>f(x)</tt> returns \c true |
|
* if and only if \c x is \c false. |
|
* |
|
* \tparam T must be convertible to \c bool. |
|
* |
|
* The following code snippet demonstrates how to use \p logical_not to transform |
|
* a device_vector of \c bools into its logical complement. |
|
* |
|
* \code |
|
* #include <thrust/device_vector.h> |
|
* #include <thrust/transform.h> |
|
* #include <thrust/functional.h> |
|
* ... |
|
* thrust::device_vector<bool> V; |
|
* ... |
|
* thrust::transform(V.begin(), V.end(), V.begin(), thrust::logical_not<bool>()); |
|
* // The elements of V are now the logical complement of what they were prior |
|
* \endcode |
|
* |
|
* \see http://www.sgi.com/tech/stl/logical_not.html |
|
* \see unary_function |
|
*/ |
|
template<typename T> |
|
struct logical_not : public unary_function<T,bool> |
|
{ |
|
/*! Function call operator. The return value is <tt>!x</tt>. |
|
*/ |
|
__host__ __device__ bool operator()(const T &x) const {return !x;} |
|
}; // end logical_not |
|
|
|
/*! \} |
|
*/ |
|
|
|
/*! \addtogroup bitwise_operations Bitwise Operations |
|
* \ingroup predefined_function_objects |
|
* \{ |
|
*/ |
|
|
|
/*! \p bit_and is a function object. Specifically, it is an Adaptable Binary Function. |
|
* If \c f is an object of class <tt>bit_and<T></tt>, and \c x and \c y are objects |
|
* of class \c T, then <tt>f(x,y)</tt> returns <tt>x&y</tt>. |
|
* |
|
* \tparam T is a model of <a href="http://www.sgi.com/tech/stl/Assignable.html">Assignable</a>, |
|
* and if \c x and \c y are objects of type \p T, then <tt>x&y</tt> must be defined and must have a return type that is convertible to \c T. |
|
* |
|
* The following code snippet demonstrates how to use <tt>bit_and</tt> to take |
|
* the bitwise AND of one device_vector of \c ints by another. |
|
* |
|
* \code |
|
* #include <thrust/device_vector.h> |
|
* #include <thrust/functional.h> |
|
* #include <thrust/sequence.h> |
|
* #include <thrust/fill.h> |
|
* #include <thrust/transform.h> |
|
* ... |
|
* const int N = 1000; |
|
* thrust::device_vector<int> V1(N); |
|
* thrust::device_vector<int> V2(N); |
|
* thrust::device_vector<int> V3(N); |
|
* |
|
* thrust::sequence(V1.begin(), V1.end(), 1); |
|
* thrust::fill(V2.begin(), V2.end(), 13); |
|
* |
|
* thrust::transform(V1.begin(), V1.end(), V2.begin(), V3.begin(), |
|
* thrust::bit_and<int>()); |
|
* // V3 is now {1&13, 2&13, 3&13, ..., 1000%13} |
|
* \endcode |
|
* |
|
* \see binary_function |
|
*/ |
|
template<typename T> |
|
struct bit_and : public binary_function<T,T,T> |
|
{ |
|
/*! Function call operator. The return value is <tt>lhs & rhs</tt>. |
|
*/ |
|
__host__ __device__ T operator()(const T &lhs, const T &rhs) const {return lhs & rhs;} |
|
}; // end bit_and |
|
|
|
/*! \p bit_or is a function object. Specifically, it is an Adaptable Binary Function. |
|
* If \c f is an object of class <tt>bit_and<T></tt>, and \c x and \c y are objects |
|
* of class \c T, then <tt>f(x,y)</tt> returns <tt>x|y</tt>. |
|
* |
|
* \tparam T is a model of <a href="http://www.sgi.com/tech/stl/Assignable.html">Assignable</a>, |
|
* and if \c x and \c y are objects of type \p T, then <tt>x|y</tt> must be defined and must have a return type that is convertible to \c T. |
|
* |
|
* The following code snippet demonstrates how to use <tt>bit_or</tt> to take |
|
* the bitwise OR of one device_vector of \c ints by another. |
|
* |
|
* \code |
|
* #include <thrust/device_vector.h> |
|
* #include <thrust/functional.h> |
|
* #include <thrust/sequence.h> |
|
* #include <thrust/fill.h> |
|
* #include <thrust/transform.h> |
|
* ... |
|
* const int N = 1000; |
|
* thrust::device_vector<int> V1(N); |
|
* thrust::device_vector<int> V2(N); |
|
* thrust::device_vector<int> V3(N); |
|
* |
|
* thrust::sequence(V1.begin(), V1.end(), 1); |
|
* thrust::fill(V2.begin(), V2.end(), 13); |
|
* |
|
* thrust::transform(V1.begin(), V1.end(), V2.begin(), V3.begin(), |
|
* thrust::bit_or<int>()); |
|
* // V3 is now {1|13, 2|13, 3|13, ..., 1000|13} |
|
* \endcode |
|
* |
|
* \see binary_function |
|
*/ |
|
template<typename T> |
|
struct bit_or : public binary_function<T,T,T> |
|
{ |
|
/*! Function call operator. The return value is <tt>lhs | rhs</tt>. |
|
*/ |
|
__host__ __device__ T operator()(const T &lhs, const T &rhs) const {return lhs | rhs;} |
|
}; // end bit_or |
|
|
|
/*! \p bit_xor is a function object. Specifically, it is an Adaptable Binary Function. |
|
* If \c f is an object of class <tt>bit_and<T></tt>, and \c x and \c y are objects |
|
* of class \c T, then <tt>f(x,y)</tt> returns <tt>x^y</tt>. |
|
* |
|
* \tparam T is a model of <a href="http://www.sgi.com/tech/stl/Assignable.html">Assignable</a>, |
|
* and if \c x and \c y are objects of type \p T, then <tt>x^y</tt> must be defined and must have a return type that is convertible to \c T. |
|
* |
|
* The following code snippet demonstrates how to use <tt>bit_xor</tt> to take |
|
* the bitwise XOR of one device_vector of \c ints by another. |
|
* |
|
* \code |
|
* #include <thrust/device_vector.h> |
|
* #include <thrust/functional.h> |
|
* #include <thrust/sequence.h> |
|
* #include <thrust/fill.h> |
|
* #include <thrust/transform.h> |
|
* ... |
|
* const int N = 1000; |
|
* thrust::device_vector<int> V1(N); |
|
* thrust::device_vector<int> V2(N); |
|
* thrust::device_vector<int> V3(N); |
|
* |
|
* thrust::sequence(V1.begin(), V1.end(), 1); |
|
* thrust::fill(V2.begin(), V2.end(), 13); |
|
* |
|
* thrust::transform(V1.begin(), V1.end(), V2.begin(), V3.begin(), |
|
* thrust::bit_xor<int>()); |
|
* // V3 is now {1^13, 2^13, 3^13, ..., 1000^13} |
|
* \endcode |
|
* |
|
* \see binary_function |
|
*/ |
|
template<typename T> |
|
struct bit_xor : public binary_function<T,T,T> |
|
{ |
|
/*! Function call operator. The return value is <tt>lhs ^ rhs</tt>. |
|
*/ |
|
__host__ __device__ T operator()(const T &lhs, const T &rhs) const {return lhs ^ rhs;} |
|
}; // end bit_xor |
|
|
|
/*! \} |
|
*/ |
|
|
|
/*! \addtogroup generalized_identity_operations Generalized Identity Operations |
|
* \ingroup predefined_function_objects |
|
* \{ |
|
*/ |
|
|
|
/*! \p identity is a Unary Function that represents the identity function: it takes |
|
* a single argument \c x, and returns \c x. |
|
* |
|
* \tparam T No requirements on \p T. |
|
* |
|
* The following code snippet demonstrates that \p identity returns its |
|
* argument. |
|
* |
|
* \code |
|
* #include <thrust/functional.h> |
|
* #include <assert.h> |
|
* ... |
|
* int x = 137; |
|
* thrust::identity<int> id; |
|
* assert(x == id(x)); |
|
* \endcode |
|
* |
|
* \see http://www.sgi.com/tech/stl/identity.html |
|
* \see unary_function |
|
*/ |
|
template<typename T> |
|
struct identity : public unary_function<T,T> |
|
{ |
|
/*! Function call operator. The return value is <tt>x</tt>. |
|
*/ |
|
__host__ __device__ const T &operator()(const T &x) const {return x;} |
|
}; // end identity |
|
|
|
/*! \p maximum is a function object that takes two arguments and returns the greater |
|
* of the two. Specifically, it is an Adaptable Binary Function. If \c f is an |
|
* object of class <tt>maximum<T></tt> and \c x and \c y are objects of class \c T |
|
* <tt>f(x,y)</tt> returns \c x if <tt>x > y</tt> and \c y, otherwise. |
|
* |
|
* \tparam T is a model of <a href="http://www.sgi.com/tech/stl/LessThanComparable.html">LessThan Comparable</a>. |
|
* |
|
* The following code snippet demonstrates that \p maximum returns its |
|
* greater argument. |
|
* |
|
* \code |
|
* #include <thrust/functional.h> |
|
* #include <assert.h> |
|
* ... |
|
* int x = 137; |
|
* int y = -137; |
|
* thrust::maximum<int> mx; |
|
* assert(x == mx(x,y)); |
|
* \endcode |
|
* |
|
* \see minimum |
|
* \see min |
|
* \see binary_function |
|
*/ |
|
template<typename T> |
|
struct maximum : public binary_function<T,T,T> |
|
{ |
|
/*! Function call operator. The return value is <tt>rhs < lhs ? lhs : rhs</tt>. |
|
*/ |
|
__host__ __device__ T operator()(const T &lhs, const T &rhs) const {return lhs < rhs ? rhs : lhs;} |
|
}; // end maximum |
|
|
|
/*! \p minimum is a function object that takes two arguments and returns the lesser |
|
* of the two. Specifically, it is an Adaptable Binary Function. If \c f is an |
|
* object of class <tt>minimum<T></tt> and \c x and \c y are objects of class \c T |
|
* <tt>f(x,y)</tt> returns \c x if <tt>x < y</tt> and \c y, otherwise. |
|
* |
|
* \tparam T is a model of <a href="http://www.sgi.com/tech/stl/LessThanComparable.html">LessThan Comparable</a>. |
|
* |
|
* The following code snippet demonstrates that \p minimum returns its |
|
* lesser argument. |
|
* |
|
* \code |
|
* #include <thrust/functional.h> |
|
* #include <assert.h> |
|
* ... |
|
* int x = 137; |
|
* int y = -137; |
|
* thrust::minimum<int> mn; |
|
* assert(y == mn(x,y)); |
|
* \endcode |
|
* |
|
* \see maximum |
|
* \see max |
|
* \see binary_function |
|
*/ |
|
template<typename T> |
|
struct minimum : public binary_function<T,T,T> |
|
{ |
|
/*! Function call operator. The return value is <tt>lhs < rhs ? lhs : rhs</tt>. |
|
*/ |
|
__host__ __device__ T operator()(const T &lhs, const T &rhs) const {return lhs < rhs ? lhs : rhs;} |
|
}; // end minimum |
|
|
|
/*! \p project1st is a function object that takes two arguments and returns |
|
* its first argument; the second argument is unused. It is essentially a |
|
* generalization of identity to the case of a Binary Function. |
|
* |
|
* \code |
|
* #include <thrust/functional.h> |
|
* #include <assert.h> |
|
* ... |
|
* int x = 137; |
|
* int y = -137; |
|
* thrust::project1st<int> pj1; |
|
* assert(x == pj1(x,y)); |
|
* \endcode |
|
* |
|
* \see identity |
|
* \see project2nd |
|
* \see binary_function |
|
*/ |
|
template<typename T1, typename T2> |
|
struct project1st : public binary_function<T1,T2,T1> |
|
{ |
|
/*! Function call operator. The return value is <tt>lhs</tt>. |
|
*/ |
|
__host__ __device__ const T1 &operator()(const T1 &lhs, const T2 &rhs) const {return lhs;} |
|
}; // end project1st |
|
|
|
/*! \p project2nd is a function object that takes two arguments and returns |
|
* its second argument; the first argument is unused. It is essentially a |
|
* generalization of identity to the case of a Binary Function. |
|
* |
|
* \code |
|
* #include <thrust/functional.h> |
|
* #include <assert.h> |
|
* ... |
|
* int x = 137; |
|
* int y = -137; |
|
* thrust::project2nd<int> pj2; |
|
* assert(y == pj2(x,y)); |
|
* \endcode |
|
* |
|
* \see identity |
|
* \see project1st |
|
* \see binary_function |
|
*/ |
|
template<typename T1, typename T2> |
|
struct project2nd : public binary_function<T1,T2,T2> |
|
{ |
|
/*! Function call operator. The return value is <tt>rhs</tt>. |
|
*/ |
|
__host__ __device__ const T2 &operator()(const T1 &lhs, const T2 &rhs) const {return rhs;} |
|
}; // end project2nd |
|
|
|
/*! \} |
|
*/ |
|
|
|
|
|
// odds and ends |
|
|
|
/*! \addtogroup function_object_adaptors |
|
* \{ |
|
*/ |
|
|
|
/*! \p unary_negate is a function object adaptor: it is an Adaptable Predicate |
|
* that represents the logical negation of some other Adaptable Predicate. |
|
* That is: if \c f is an object of class <tt>unary_negate<AdaptablePredicate></tt>, |
|
* then there exists an object \c pred of class \c AdaptablePredicate such |
|
* that <tt>f(x)</tt> always returns the same value as <tt>!pred(x)</tt>. |
|
* There is rarely any reason to construct a <tt>unary_negate</tt> directly; |
|
* it is almost always easier to use the helper function not1. |
|
* |
|
* \see http://www.sgi.com/tech/stl/unary_negate.html |
|
* \see not1 |
|
*/ |
|
template<typename Predicate> |
|
struct unary_negate |
|
: public thrust::unary_function<typename Predicate::argument_type, bool> |
|
{ |
|
/*! Constructor takes a \p Predicate object to negate. |
|
* \param p The \p Predicate object to negate. |
|
*/ |
|
__host__ __device__ |
|
explicit unary_negate(Predicate p) : pred(p){} |
|
|
|
/*! Function call operator. The return value is <tt>!pred(x)</tt>. |
|
*/ |
|
__host__ __device__ |
|
bool operator()(const typename Predicate::argument_type& x) { return !pred(x); } |
|
|
|
/*! \cond */ |
|
Predicate pred; |
|
/*! \endcond */ |
|
}; // end unary_negate |
|
|
|
/*! \p not1 is a helper function to simplify the creation of Adaptable Predicates: |
|
* it takes an Adaptable Predicate \p pred as an argument and returns a new Adaptable |
|
* Predicate that represents the negation of \p pred. That is: if \c pred is an object |
|
* of a type which models Adaptable Predicate, then the the type of the result |
|
* \c npred of <tt>not1(pred)</tt> is also a model of Adaptable Predicate and |
|
* <tt>npred(x)</tt> always returns the same value as <tt>!pred(x)</tt>. |
|
* |
|
* \param pred The Adaptable Predicate to negate. |
|
* \return A new object, <tt>npred</tt> such that <tt>npred(x)</tt> always returns |
|
* the same value as <tt>!pred(x)</tt>. |
|
* |
|
* \tparam Predicate is a model of <a href="http://www.sgi.com/tech/stl/AdaptablePredicate.html">Adaptable Predicate</a>. |
|
* |
|
* \see unary_negate |
|
* \see not2 |
|
*/ |
|
template<typename Predicate> |
|
__host__ __device__ |
|
unary_negate<Predicate> not1(const Predicate &pred); |
|
|
|
/*! \p binary_negate is a function object adaptor: it is an Adaptable Binary |
|
* Predicate that represents the logical negation of some other Adaptable |
|
* Binary Predicate. That is: if \c f is an object of class <tt>binary_negate<AdaptablePredicate></tt>, |
|
* then there exists an object \c pred of class \c AdaptableBinaryPredicate |
|
* such that <tt>f(x,y)</tt> always returns the same value as <tt>!pred(x,y)</tt>. |
|
* There is rarely any reason to construct a <tt>binary_negate</tt> directly; |
|
* it is almost always easier to use the helper function not2. |
|
* |
|
* \see http://www.sgi.com/tech/stl/binary_negate.html |
|
*/ |
|
template<typename Predicate> |
|
struct binary_negate |
|
: public thrust::binary_function<typename Predicate::first_argument_type, |
|
typename Predicate::second_argument_type, |
|
bool> |
|
{ |
|
/*! Constructor takes a \p Predicate object to negate. |
|
* \param p The \p Predicate object to negate. |
|
*/ |
|
__host__ __device__ |
|
explicit binary_negate(Predicate p) : pred(p){} |
|
|
|
/*! Function call operator. The return value is <tt>!pred(x,y)</tt>. |
|
*/ |
|
__host__ __device__ |
|
bool operator()(const typename Predicate::first_argument_type& x, const typename Predicate::second_argument_type& y) |
|
{ |
|
return !pred(x,y); |
|
} |
|
|
|
/*! \cond */ |
|
Predicate pred; |
|
/*! \endcond */ |
|
}; // end binary_negate |
|
|
|
/*! \p not2 is a helper function to simplify the creation of Adaptable Binary Predicates: |
|
* it takes an Adaptable Binary Predicate \p pred as an argument and returns a new Adaptable |
|
* Binary Predicate that represents the negation of \p pred. That is: if \c pred is an object |
|
* of a type which models Adaptable Binary Predicate, then the the type of the result |
|
* \c npred of <tt>not2(pred)</tt> is also a model of Adaptable Binary Predicate and |
|
* <tt>npred(x,y)</tt> always returns the same value as <tt>!pred(x,y)</tt>. |
|
* |
|
* \param pred The Adaptable Binary Predicate to negate. |
|
* \return A new object, <tt>npred</tt> such that <tt>npred(x,y)</tt> always returns |
|
* the same value as <tt>!pred(x,y)</tt>. |
|
* |
|
* \tparam Binary Predicate is a model of <a href="http://www.sgi.com/tech/stl/AdaptableBinaryPredicate.html">Adaptable Binary Predicate</a>. |
|
* |
|
* \see binary_negate |
|
* \see not1 |
|
*/ |
|
template<typename BinaryPredicate> |
|
__host__ __device__ |
|
binary_negate<BinaryPredicate> not2(const BinaryPredicate &pred); |
|
|
|
/*! \} |
|
*/ |
|
|
|
|
|
/*! \addtogroup placeholder_objects Placeholder Objects |
|
* \ingroup function_objects |
|
* \{ |
|
*/ |
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/*! \namespace placeholders |
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* \brief Facilities for constructing simple functions inline. |
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* |
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* Objects in the \p thrust::placeholders namespace may be used to create simple arithmetic functions inline |
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* in an algorithm invocation. Combining placeholders such as \p _1 and \p _2 with arithmetic operations such as \c + |
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* creates an unnamed function object which applies the operation to their arguments. |
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* |
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* The type of placeholder objects is implementation-defined. |
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* |
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* The following code snippet demonstrates how to use the placeholders \p _1 and \p _2 with \p thrust::transform |
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* to implement the SAXPY computation: |
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* |
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* \code |
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* #include <thrust/device_vector.h> |
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* #include <thrust/transform.h> |
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* #include <thrust/functional.h> |
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* |
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* int main() |
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* { |
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* thrust::device_vector<float> x(4), y(4); |
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* x[0] = 1; |
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* x[1] = 2; |
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* x[2] = 3; |
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* x[3] = 4; |
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* |
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* y[0] = 1; |
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* y[1] = 1; |
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* y[2] = 1; |
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* y[3] = 1; |
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* |
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* float a = 2.0f; |
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* |
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* using namespace thrust::placeholders; |
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* |
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* thrust::transform(x.begin(), x.end(), y.begin(), y.begin(), |
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* a * _1 + 2 |
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* ); |
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* |
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* // y is now {3, 5, 7, 9} |
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* } |
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* \endcode |
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*/ |
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namespace placeholders |
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{ |
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/*! \p thrust::placeholders::_1 is the placeholder for the first function parameter. |
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*/ |
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static const thrust::detail::functional::placeholder<0>::type _1; |
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/*! \p thrust::placeholders::_2 is the placeholder for the second function parameter. |
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*/ |
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static const thrust::detail::functional::placeholder<1>::type _2; |
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/*! \p thrust::placeholders::_3 is the placeholder for the third function parameter. |
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*/ |
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static const thrust::detail::functional::placeholder<2>::type _3; |
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/*! \p thrust::placeholders::_4 is the placeholder for the fourth function parameter. |
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*/ |
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static const thrust::detail::functional::placeholder<3>::type _4; |
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/*! \p thrust::placeholders::_5 is the placeholder for the fifth function parameter. |
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*/ |
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static const thrust::detail::functional::placeholder<4>::type _5; |
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/*! \p thrust::placeholders::_6 is the placeholder for the sixth function parameter. |
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*/ |
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static const thrust::detail::functional::placeholder<5>::type _6; |
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/*! \p thrust::placeholders::_7 is the placeholder for the seventh function parameter. |
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*/ |
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static const thrust::detail::functional::placeholder<6>::type _7; |
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/*! \p thrust::placeholders::_8 is the placeholder for the eighth function parameter. |
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*/ |
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static const thrust::detail::functional::placeholder<7>::type _8; |
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/*! \p thrust::placeholders::_9 is the placeholder for the ninth function parameter. |
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*/ |
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static const thrust::detail::functional::placeholder<8>::type _9; |
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/*! \p thrust::placeholders::_10 is the placeholder for the tenth function parameter. |
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*/ |
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static const thrust::detail::functional::placeholder<9>::type _10; |
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} // end placeholders |
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/*! \} // placeholder_objects |
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*/ |
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} // end thrust |
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#include <thrust/detail/functional.inl> |
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#include <thrust/detail/functional/operators.h> |
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