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237 lines
9.5 KiB
237 lines
9.5 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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/*! \file equal.h
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* \brief Equality between ranges
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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/execution_policy.h>
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namespace thrust
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{
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/*! \addtogroup reductions
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* \{
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* \addtogroup comparisons
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* \ingroup reductions
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* \{
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*/
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/*! \p equal returns \c true if the two ranges <tt>[first1, last1)</tt>
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* and <tt>[first2, first2 + (last1 - first1))</tt> are identical when
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* compared element-by-element, and otherwise returns \c false.
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*
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* This version of \p equal returns \c true if and only if for every
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* iterator \c i in <tt>[first1, last1)</tt>, <tt>*i == *(first2 + (i - first1))</tt>.
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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 first1 The beginning of the first sequence.
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* \param last1 The end of the first sequence.
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* \param first2 The beginning of the second sequence.
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* \return \c true, if the sequences are equal; \c false, otherwise.
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*
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* \tparam DerivedPolicy The name of the derived execution policy.
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* \tparam InputIterator1 is a model of <a href="http://www.sgi.com/tech/stl/InputIterator.html">Input Iterator</a>,
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* and \p InputIterator1's \c value_type is a model of <a href="http://www.sgi.com/tech/stl/EqualityComparable.html">Equality Comparable</a>,
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* and \p InputIterator1's \c value_type can be compared for equality with \c InputIterator2's \c value_type.
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* \tparam InputIterator2 is a model of <a href="http://www.sgi.com/tech/stl/InputIterator.html">Input Iterator</a>,
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* and \p InputIterator2's \c value_type is a model of <a href="http://www.sgi.com/tech/stl/EqualityComparable.html">Equality Comparable</a>,
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* and \p InputIterator2's \c value_type can be compared for equality with \c InputIterator1's \c value_type.
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*
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* The following code snippet demonstrates how to use \p equal to test
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* two ranges for equality using the \p thrust::host execution policy:
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*
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* \code
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* #include <thrust/equal.h>
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* #include <thrust/execution_policy.h>
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* ...
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* int A1[7] = {3, 1, 4, 1, 5, 9, 3};
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* int A2[7] = {3, 1, 4, 2, 8, 5, 7};
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* ...
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* bool result = thrust::equal(thrust::host, A1, A1 + 7, A2);
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*
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* // result == false
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* \endcode
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*
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* \see http://www.sgi.com/tech/stl/equal.html
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*/
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template<typename DerivedPolicy, typename InputIterator1, typename InputIterator2>
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bool equal(const thrust::detail::execution_policy_base<DerivedPolicy> &exec, InputIterator1 first1, InputIterator1 last1, InputIterator2 first2);
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/*! \p equal returns \c true if the two ranges <tt>[first1, last1)</tt>
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* and <tt>[first2, first2 + (last1 - first1))</tt> are identical when
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* compared element-by-element, and otherwise returns \c false.
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*
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* This version of \p equal returns \c true if and only if for every
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* iterator \c i in <tt>[first1, last1)</tt>, <tt>*i == *(first2 + (i - first1))</tt>.
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*
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* \param first1 The beginning of the first sequence.
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* \param last1 The end of the first sequence.
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* \param first2 The beginning of the second sequence.
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* \return \c true, if the sequences are equal; \c false, otherwise.
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*
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* \tparam InputIterator1 is a model of <a href="http://www.sgi.com/tech/stl/InputIterator.html">Input Iterator</a>,
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* and \p InputIterator1's \c value_type is a model of <a href="http://www.sgi.com/tech/stl/EqualityComparable.html">Equality Comparable</a>,
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* and \p InputIterator1's \c value_type can be compared for equality with \c InputIterator2's \c value_type.
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* \tparam InputIterator2 is a model of <a href="http://www.sgi.com/tech/stl/InputIterator.html">Input Iterator</a>,
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* and \p InputIterator2's \c value_type is a model of <a href="http://www.sgi.com/tech/stl/EqualityComparable.html">Equality Comparable</a>,
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* and \p InputIterator2's \c value_type can be compared for equality with \c InputIterator1's \c value_type.
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*
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* The following code snippet demonstrates how to use \p equal to test
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* two ranges for equality.
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*
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* \code
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* #include <thrust/equal.h>
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* ...
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* int A1[7] = {3, 1, 4, 1, 5, 9, 3};
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* int A2[7] = {3, 1, 4, 2, 8, 5, 7};
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* ...
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* bool result = thrust::equal(A1, A1 + 7, A2);
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*
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* // result == false
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* \endcode
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*
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* \see http://www.sgi.com/tech/stl/equal.html
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*/
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template <typename InputIterator1, typename InputIterator2>
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bool equal(InputIterator1 first1, InputIterator1 last1,
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InputIterator2 first2);
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/*! \p equal returns \c true if the two ranges <tt>[first1, last1)</tt>
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* and <tt>[first2, first2 + (last1 - first1))</tt> are identical when
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* compared element-by-element, and otherwise returns \c false.
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*
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* This version of \p equal returns \c true if and only if for every
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* iterator \c i in <tt>[first1, last1)</tt>,
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* <tt>binary_pred(*i, *(first2 + (i - first1)))</tt> is \c true.
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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 first1 The beginning of the first sequence.
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* \param last1 The end of the first sequence.
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* \param first2 The beginning of the second sequence.
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* \param binary_pred Binary predicate used to test element equality.
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* \return \c true, if the sequences are equal; \c false, otherwise.
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*
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* \tparam DerivedPolicy The name of the derived execution policy.
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* \tparam InputIterator1 is a model of <a href="http://www.sgi.com/tech/stl/InputIterator.html">Input Iterator</a>,
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* and \p InputIterator1's \c value_type is convertible to \p BinaryPredicate's \c first_argument_type.
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* \tparam InputIterator2 is a model of <a href="http://www.sgi.com/tech/stl/InputIterator.html">Input Iterator</a>,
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* and \p InputIterator2's \c value_type is convertible to \p BinaryPredicate's \c second_argument_type.
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* \tparam BinaryPredicate is a model of <a href="http://www.sgi.com/tech/stl/BinaryPredicate.html">Binary Predicate</a>.
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*
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* The following code snippet demonstrates how to use \p equal to compare the
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* elements in two ranges modulo 2 using the \p thrust::host execution policy.
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*
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* \code
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* #include <thrust/equal.h>
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* #include <thrust/execution_policy.h>
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* ...
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*
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* __host__ __device__
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* struct compare_modulo_two
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* {
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* bool operator()(int x, int y)
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* {
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* return (x % 2) == (y % 2);
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* }
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* };
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* ...
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* int x[5] = {0, 2, 4, 6, 8, 10};
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* int y[5] = {1, 3, 5, 7, 9, 11};
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*
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* bool result = thrust::equal(x, x + 5, y, compare_modulo_two());
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*
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* // result is true
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* \endcode
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*
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* \see http://www.sgi.com/tech/stl/equal.html
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*/
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template<typename DerivedPolicy, typename InputIterator1, typename InputIterator2, typename BinaryPredicate>
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bool equal(const thrust::detail::execution_policy_base<DerivedPolicy> &exec, InputIterator1 first1, InputIterator1 last1, InputIterator2 first2, BinaryPredicate binary_pred);
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/*! \p equal returns \c true if the two ranges <tt>[first1, last1)</tt>
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* and <tt>[first2, first2 + (last1 - first1))</tt> are identical when
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* compared element-by-element, and otherwise returns \c false.
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*
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* This version of \p equal returns \c true if and only if for every
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* iterator \c i in <tt>[first1, last1)</tt>,
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* <tt>binary_pred(*i, *(first2 + (i - first1)))</tt> is \c true.
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*
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* \param first1 The beginning of the first sequence.
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* \param last1 The end of the first sequence.
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* \param first2 The beginning of the second sequence.
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* \param binary_pred Binary predicate used to test element equality.
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* \return \c true, if the sequences are equal; \c false, otherwise.
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*
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* \tparam InputIterator1 is a model of <a href="http://www.sgi.com/tech/stl/InputIterator.html">Input Iterator</a>,
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* and \p InputIterator1's \c value_type is convertible to \p BinaryPredicate's \c first_argument_type.
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* \tparam InputIterator2 is a model of <a href="http://www.sgi.com/tech/stl/InputIterator.html">Input Iterator</a>,
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* and \p InputIterator2's \c value_type is convertible to \p BinaryPredicate's \c second_argument_type.
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* \tparam BinaryPredicate is a model of <a href="http://www.sgi.com/tech/stl/BinaryPredicate.html">Binary Predicate</a>.
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*
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* The following code snippet demonstrates how to use \p equal to compare the
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* elements in two ranges modulo 2.
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*
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* \code
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* #include <thrust/equal.h>
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*
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* __host__ __device__
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* struct compare_modulo_two
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* {
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* bool operator()(int x, int y)
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* {
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* return (x % 2) == (y % 2);
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* }
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* };
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* ...
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* int x[5] = {0, 2, 4, 6, 8, 10};
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* int y[5] = {1, 3, 5, 7, 9, 11};
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*
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* bool result = thrust::equal(x, x + 5, y, compare_modulo_two());
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*
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* // result is true
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* \endcode
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*
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* \see http://www.sgi.com/tech/stl/equal.html
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*/
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template <typename InputIterator1, typename InputIterator2,
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typename BinaryPredicate>
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bool equal(InputIterator1 first1, InputIterator1 last1,
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InputIterator2 first2, BinaryPredicate binary_pred);
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/*! \} // end comparisons
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* \} // end reductions
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*/
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} // end namespace thrust
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#include <thrust/detail/equal.inl>
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