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/*
* Copyright 2008-2013 NVIDIA Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*! \file equal.h
* \brief Equality between ranges
*/
#pragma once
#include <thrust/detail/config.h>
#include <thrust/detail/execution_policy.h>
THRUST_NAMESPACE_BEGIN
/*! \addtogroup reductions
* \{
* \addtogroup comparisons
* \ingroup reductions
* \{
*/
/*! \p equal returns \c true if the two ranges <tt>[first1, last1)</tt>
* and <tt>[first2, first2 + (last1 - first1))</tt> are identical when
* compared element-by-element, and otherwise returns \c false.
*
* This version of \p equal returns \c true if and only if for every
* iterator \c i in <tt>[first1, last1)</tt>, <tt>*i == *(first2 + (i - first1))</tt>.
*
* The algorithm's execution is parallelized as determined by \p exec.
*
* \param exec The execution policy to use for parallelization.
* \param first1 The beginning of the first sequence.
* \param last1 The end of the first sequence.
* \param first2 The beginning of the second sequence.
* \return \c true, if the sequences are equal; \c false, otherwise.
*
* \tparam DerivedPolicy The name of the derived execution policy.
* \tparam InputIterator1 is a model of <a href="https://en.cppreference.com/w/cpp/iterator/input_iterator">Input Iterator</a>,
* and \p InputIterator1's \c value_type is a model of <a href="https://en.cppreference.com/w/cpp/concepts/equality_comparable">Equality Comparable</a>,
* and \p InputIterator1's \c value_type can be compared for equality with \c InputIterator2's \c value_type.
* \tparam InputIterator2 is a model of <a href="https://en.cppreference.com/w/cpp/iterator/input_iterator">Input Iterator</a>,
* and \p InputIterator2's \c value_type is a model of <a href="https://en.cppreference.com/w/cpp/concepts/equality_comparable">Equality Comparable</a>,
* and \p InputIterator2's \c value_type can be compared for equality with \c InputIterator1's \c value_type.
*
* The following code snippet demonstrates how to use \p equal to test
* two ranges for equality using the \p thrust::host execution policy:
*
* \code
* #include <thrust/equal.h>
* #include <thrust/execution_policy.h>
* ...
* int A1[7] = {3, 1, 4, 1, 5, 9, 3};
* int A2[7] = {3, 1, 4, 2, 8, 5, 7};
* ...
* bool result = thrust::equal(thrust::host, A1, A1 + 7, A2);
*
* // result == false
* \endcode
*
* \see https://en.cppreference.com/w/cpp/algorithm/equal
*/
template<typename DerivedPolicy, typename InputIterator1, typename InputIterator2>
__host__ __device__
bool equal(const thrust::detail::execution_policy_base<DerivedPolicy> &exec, InputIterator1 first1, InputIterator1 last1, InputIterator2 first2);
/*! \p equal returns \c true if the two ranges <tt>[first1, last1)</tt>
* and <tt>[first2, first2 + (last1 - first1))</tt> are identical when
* compared element-by-element, and otherwise returns \c false.
*
* This version of \p equal returns \c true if and only if for every
* iterator \c i in <tt>[first1, last1)</tt>, <tt>*i == *(first2 + (i - first1))</tt>.
*
* \param first1 The beginning of the first sequence.
* \param last1 The end of the first sequence.
* \param first2 The beginning of the second sequence.
* \return \c true, if the sequences are equal; \c false, otherwise.
*
* \tparam InputIterator1 is a model of <a href="https://en.cppreference.com/w/cpp/iterator/input_iterator">Input Iterator</a>,
* and \p InputIterator1's \c value_type is a model of <a href="https://en.cppreference.com/w/cpp/concepts/equality_comparable">Equality Comparable</a>,
* and \p InputIterator1's \c value_type can be compared for equality with \c InputIterator2's \c value_type.
* \tparam InputIterator2 is a model of <a href="https://en.cppreference.com/w/cpp/iterator/input_iterator">Input Iterator</a>,
* and \p InputIterator2's \c value_type is a model of <a href="https://en.cppreference.com/w/cpp/concepts/equality_comparable">Equality Comparable</a>,
* and \p InputIterator2's \c value_type can be compared for equality with \c InputIterator1's \c value_type.
*
* The following code snippet demonstrates how to use \p equal to test
* two ranges for equality.
*
* \code
* #include <thrust/equal.h>
* ...
* int A1[7] = {3, 1, 4, 1, 5, 9, 3};
* int A2[7] = {3, 1, 4, 2, 8, 5, 7};
* ...
* bool result = thrust::equal(A1, A1 + 7, A2);
*
* // result == false
* \endcode
*
* \see https://en.cppreference.com/w/cpp/algorithm/equal
*/
template <typename InputIterator1, typename InputIterator2>
bool equal(InputIterator1 first1, InputIterator1 last1,
InputIterator2 first2);
/*! \p equal returns \c true if the two ranges <tt>[first1, last1)</tt>
* and <tt>[first2, first2 + (last1 - first1))</tt> are identical when
* compared element-by-element, and otherwise returns \c false.
*
* This version of \p equal returns \c true if and only if for every
* iterator \c i in <tt>[first1, last1)</tt>,
* <tt>binary_pred(*i, *(first2 + (i - first1)))</tt> is \c true.
*
* The algorithm's execution is parallelized as determined by \p exec.
*
* \param exec The execution policy to use for parallelization.
* \param first1 The beginning of the first sequence.
* \param last1 The end of the first sequence.
* \param first2 The beginning of the second sequence.
* \param binary_pred Binary predicate used to test element equality.
* \return \c true, if the sequences are equal; \c false, otherwise.
*
* \tparam DerivedPolicy The name of the derived execution policy.
* \tparam InputIterator1 is a model of <a href="https://en.cppreference.com/w/cpp/iterator/input_iterator">Input Iterator</a>,
* and \p InputIterator1's \c value_type is convertible to \p BinaryPredicate's \c first_argument_type.
* \tparam InputIterator2 is a model of <a href="https://en.cppreference.com/w/cpp/iterator/input_iterator">Input Iterator</a>,
* and \p InputIterator2's \c value_type is convertible to \p BinaryPredicate's \c second_argument_type.
* \tparam BinaryPredicate is a model of <a href="https://en.cppreference.com/w/cpp/named_req/BinaryPredicate">Binary Predicate</a>.
*
* The following code snippet demonstrates how to use \p equal to compare the
* elements in two ranges modulo 2 using the \p thrust::host execution policy.
*
* \code
* #include <thrust/equal.h>
* #include <thrust/execution_policy.h>
* ...
*
* struct compare_modulo_two
* {
* __host__ __device__
* bool operator()(int x, int y) const
* {
* return (x % 2) == (y % 2);
* }
* };
* ...
* int x[6] = {0, 2, 4, 6, 8, 10};
* int y[6] = {1, 3, 5, 7, 9, 11};
*
* bool result = thrust::equal(x, x + 6, y, compare_modulo_two());
*
* // result is false
* \endcode
*
* \see https://en.cppreference.com/w/cpp/algorithm/equal
*/
template<typename DerivedPolicy, typename InputIterator1, typename InputIterator2, typename BinaryPredicate>
__host__ __device__
bool equal(const thrust::detail::execution_policy_base<DerivedPolicy> &exec, InputIterator1 first1, InputIterator1 last1, InputIterator2 first2, BinaryPredicate binary_pred);
/*! \p equal returns \c true if the two ranges <tt>[first1, last1)</tt>
* and <tt>[first2, first2 + (last1 - first1))</tt> are identical when
* compared element-by-element, and otherwise returns \c false.
*
* This version of \p equal returns \c true if and only if for every
* iterator \c i in <tt>[first1, last1)</tt>,
* <tt>binary_pred(*i, *(first2 + (i - first1)))</tt> is \c true.
*
* \param first1 The beginning of the first sequence.
* \param last1 The end of the first sequence.
* \param first2 The beginning of the second sequence.
* \param binary_pred Binary predicate used to test element equality.
* \return \c true, if the sequences are equal; \c false, otherwise.
*
* \tparam InputIterator1 is a model of <a href="https://en.cppreference.com/w/cpp/iterator/input_iterator">Input Iterator</a>,
* and \p InputIterator1's \c value_type is convertible to \p BinaryPredicate's \c first_argument_type.
* \tparam InputIterator2 is a model of <a href="https://en.cppreference.com/w/cpp/iterator/input_iterator">Input Iterator</a>,
* and \p InputIterator2's \c value_type is convertible to \p BinaryPredicate's \c second_argument_type.
* \tparam BinaryPredicate is a model of <a href="https://en.cppreference.com/w/cpp/named_req/BinaryPredicate">Binary Predicate</a>.
*
* The following code snippet demonstrates how to use \p equal to compare the
* elements in two ranges modulo 2.
*
* \code
* #include <thrust/equal.h>
*
* struct compare_modulo_two
* {
* __host__ __device__
* bool operator()(int x, int y) const
* {
* return (x % 2) == (y % 2);
* }
* };
* ...
* int x[6] = {0, 2, 4, 6, 8, 10};
* int y[6] = {1, 3, 5, 7, 9, 11};
*
* bool result = thrust::equal(x, x + 5, y, compare_modulo_two());
*
* // result is true
* \endcode
*
* \see https://en.cppreference.com/w/cpp/algorithm/equal
*/
template <typename InputIterator1, typename InputIterator2,
typename BinaryPredicate>
bool equal(InputIterator1 first1, InputIterator1 last1,
InputIterator2 first2, BinaryPredicate binary_pred);
/*! \} // end comparisons
* \} // end reductions
*/
THRUST_NAMESPACE_END
#include <thrust/detail/equal.inl>