hpx/parallel/container_algorithms/mismatch.hpp#

See Public API for a list of names and headers that are part of the public HPX API.

namespace hpx

Top-level namespace.

namespace ranges

Functions

template<typename ExPolicy, typename Iter1, typename Sent1, typename Iter2, typename Sent2, typename Pred = equal_to, typename Proj1 = hpx::parallel::util::projection_identity, typename Proj2 = hpx::parallel::util::projection_identity>
hpx::parallel::util::detail::algorithm_result<ExPolicy, mismatch_result<Iter1, Iter2>>::type mismatch(ExPolicy &&policy, Iter1 first1, Sent1 last1, Iter2 first2, Sent2 last2, Pred &&op = Pred(), Proj1 &&proj1 = Proj1(), Proj2 &&proj2 = Proj2())#

Returns true if the range [first1, last1) is mismatch to the range [first2, last2), and false otherwise.

The comparison operations in the parallel mismatch algorithm invoked with an execution policy object of type sequenced_policy execute in sequential order in the calling thread.

The comparison operations in the parallel mismatch algorithm invoked with an execution policy object of type parallel_policy or parallel_task_policy are permitted to execute in an unordered fashion in unspecified threads, and indeterminately sequenced within each thread.

Note

Complexity: At most min(last1 - first1, last2 - first2) applications of the predicate f. If FwdIter1 and FwdIter2 meet the requirements of RandomAccessIterator and (last1 - first1) != (last2 - first2) then no applications of the predicate f are made.

Note

The two ranges are considered mismatch if, for every iterator i in the range [first1,last1), *i mismatchs *(first2 + (i - first1)). This overload of mismatch uses operator== to determine if two elements are mismatch.

Template Parameters
  • ExPolicy – The type of the execution policy to use (deduced). It describes the manner in which the execution of the algorithm may be parallelized and the manner in which it executes the assignments.

  • Iter1 – The type of the source iterators used for the first range (deduced). This iterator type must meet the requirements of an forward iterator.

  • Sent1 – The type of the source iterators used for the end of the first range (deduced).

  • Iter2 – The type of the source iterators used for the second range (deduced). This iterator type must meet the requirements of an forward iterator.

  • Sent2 – The type of the source iterators used for the end of the second range (deduced).

  • Pred – The type of an optional function/function object to use. Unlike its sequential form, the parallel overload of mismatch requires Pred to meet the requirements of CopyConstructible. This defaults to std::equal_to<>

  • Proj1 – The type of an optional projection function applied to the first range. This defaults to util::projection_identity

  • Proj2 – The type of an optional projection function applied to the second range. This defaults to util::projection_identity

Parameters
  • policy – The execution policy to use for the scheduling of the iterations.

  • first1 – Refers to the beginning of the sequence of elements of the first range the algorithm will be applied to.

  • last1 – Refers to the end of the sequence of elements of the first range the algorithm will be applied to.

  • first2 – Refers to the beginning of the sequence of elements of the second range the algorithm will be applied to.

  • last2 – Refers to the end of the sequence of elements of the second range the algorithm will be applied to.

  • op – The binary predicate which returns true if the elements should be treated as mismatch. The signature of the predicate function should be equivalent to the following:

    bool pred(const Type1 &a, const Type2 &b);
    
    The signature does not need to have const &, but the function must not modify the objects passed to it. The types Type1 and Type2 must be such that objects of types FwdIter1 and FwdIter2 can be dereferenced and then implicitly converted to Type1 and Type2 respectively

  • proj1 – Specifies the function (or function object) which will be invoked for each of the elements of the first range as a projection operation before the actual predicate is invoked.

  • proj2 – Specifies the function (or function object) which will be invoked for each of the elements of the second range as a projection operation before the actual predicate is invoked.

Returns

The mismatch algorithm returns a hpx::future<bool> if the execution policy is of type sequenced_task_policy or parallel_task_policy and returns bool otherwise. The mismatch algorithm returns true if the elements in the two ranges are mismatch, otherwise it returns false. If the length of the range [first1, last1) does not mismatch the length of the range [first2, last2), it returns false.

template<typename ExPolicy, typename Rng1, typename Rng2, typename Pred = equal_to, typename Proj1 = hpx::parallel::util::projection_identity, typename Proj2 = hpx::parallel::util::projection_identity>
hpx::parallel::util::detail::algorithm_result<ExPolicy, mismatch_result<typename hpx::traits::range_traits<Rng1>::iterator_type, typename hpx::traits::range_traits<Rng2>::iterator_type>>::type mismatch(ExPolicy &&policy, Rng1 &&rng1, Rng2 &&rng2, Pred &&op = Pred(), Proj1 &&proj1 = Proj1(), Proj2 &&proj2 = Proj2())#

Returns std::pair with iterators to the first two non-equivalent elements.

The comparison operations in the parallel mismatch algorithm invoked with an execution policy object of type sequenced_policy execute in sequential order in the calling thread.

The comparison operations in the parallel mismatch algorithm invoked with an execution policy object of type parallel_policy or parallel_task_policy are permitted to execute in an unordered fashion in unspecified threads, and indeterminately sequenced within each thread.

Note

Complexity: At most last1 - first1 applications of the predicate f.

Template Parameters
  • ExPolicy – The type of the execution policy to use (deduced). It describes the manner in which the execution of the algorithm may be parallelized and the manner in which it executes the assignments.

  • Rng1 – The type of the first source range used (deduced). The iterators extracted from this range type must meet the requirements of an forward iterator.

  • Rng2 – The type of the second source range used (deduced). The iterators extracted from this range type must meet the requirements of an forward iterator.

  • Pred – The type of an optional function/function object to use. Unlike its sequential form, the parallel overload of mismatch requires Pred to meet the requirements of CopyConstructible. This defaults to std::equal_to<>

  • Proj1 – The type of an optional projection function applied to the first range. This defaults to util::projection_identity

  • Proj2 – The type of an optional projection function applied to the second range. This defaults to util::projection_identity

Parameters
  • policy – The execution policy to use for the scheduling of the iterations.

  • rng1 – Refers to the first sequence of elements the algorithm will be applied to.

  • rng2 – Refers to the second sequence of elements the algorithm will be applied to.

  • op – The binary predicate which returns true if the elements should be treated as mismatch. The signature of the predicate function should be equivalent to the following:

    bool pred(const Type1 &a, const Type2 &b);
    
    The signature does not need to have const &, but the function must not modify the objects passed to it. The types Type1 and Type2 must be such that objects of types FwdIter1 and FwdIter2 can be dereferenced and then implicitly converted to Type1 and Type2 respectively

  • proj1 – Specifies the function (or function object) which will be invoked for each of the elements of the first range as a projection operation before the actual predicate is invoked.

  • proj2 – Specifies the function (or function object) which will be invoked for each of the elements of the second range as a projection operation before the actual predicate is invoked.

Returns

The mismatch algorithm returns a hpx::future<std::pair<FwdIter1, FwdIter2> > if the execution policy is of type sequenced_task_policy or parallel_task_policy and returns std::pair<FwdIter1, FwdIter2> otherwise. The mismatch algorithm returns the first mismatching pair of elements from two ranges: one defined by [first1, last1) and another defined by [first2, last2).

template<typename Iter1, typename Sent1, typename Iter2, typename Sent2, typename Pred = equal_to, typename Proj1 = hpx::parallel::util::projection_identity, typename Proj2 = hpx::parallel::util::projection_identity>
mismatch_result<Iter1, Iter2> mismatch(Iter1 first1, Sent1 last1, Iter2 first2, Sent2 last2, Pred &&op = Pred(), Proj1 &&proj1 = Proj1(), Proj2 &&proj2 = Proj2())#

Returns true if the range [first1, last1) is mismatch to the range [first2, last2), and false otherwise.

Note

Complexity: At most min(last1 - first1, last2 - first2) applications of the predicate f. If FwdIter1 and FwdIter2 meet the requirements of RandomAccessIterator and (last1 - first1) != (last2 - first2) then no applications of the predicate f are made.

Note

The two ranges are considered mismatch if, for every iterator i in the range [first1,last1), *i mismatchs *(first2 + (i - first1)). This overload of mismatch uses operator== to determine if two elements are mismatch.

Template Parameters
  • Iter1 – The type of the source iterators used for the first range (deduced). This iterator type must meet the requirements of an forward iterator.

  • Sent1 – The type of the source iterators used for the end of the first range (deduced).

  • Iter2 – The type of the source iterators used for the second range (deduced). This iterator type must meet the requirements of an forward iterator.

  • Sent2 – The type of the source iterators used for the end of the second range (deduced).

  • Pred – The type of an optional function/function object to use. Unlike its sequential form, the parallel overload of mismatch requires Pred to meet the requirements of CopyConstructible. This defaults to std::equal_to<>

  • Proj1 – The type of an optional projection function applied to the first range. This defaults to util::projection_identity

  • Proj2 – The type of an optional projection function applied to the second range. This defaults to util::projection_identity

Parameters
  • first1 – Refers to the beginning of the sequence of elements of the first range the algorithm will be applied to.

  • last1 – Refers to the end of the sequence of elements of the first range the algorithm will be applied to.

  • first2 – Refers to the beginning of the sequence of elements of the second range the algorithm will be applied to.

  • last2 – Refers to the end of the sequence of elements of the second range the algorithm will be applied to.

  • op – The binary predicate which returns true if the elements should be treated as mismatch. The signature of the predicate function should be equivalent to the following:

    bool pred(const Type1 &a, const Type2 &b);
    
    The signature does not need to have const &, but the function must not modify the objects passed to it. The types Type1 and Type2 must be such that objects of types FwdIter1 and FwdIter2 can be dereferenced and then implicitly converted to Type1 and Type2 respectively

  • proj1 – Specifies the function (or function object) which will be invoked for each of the elements of the first range as a projection operation before the actual predicate is invoked.

  • proj2 – Specifies the function (or function object) which will be invoked for each of the elements of the second range as a projection operation before the actual predicate is invoked.

Returns

The mismatch algorithm returns bool. The mismatch algorithm returns true if the elements in the two ranges are mismatch, otherwise it returns false. If the length of the range [first1, last1) does not mismatch the length of the range [first2, last2), it returns false.

template<typename Rng1, typename Rng2, typename Pred = equal_to, typename Proj1 = hpx::parallel::util::projection_identity, typename Proj2 = hpx::parallel::util::projection_identity>
mismatch_result<typename hpx::traits::range_traits<Rng1>::iterator_type, typename hpx::traits::range_traits<Rng2>::iterator_type> mismatch(Rng1 &&rng1, Rng2 &&rng2, Pred &&op = Pred(), Proj1 &&proj1 = Proj1(), Proj2 &&proj2 = Proj2())#

Returns std::pair with iterators to the first two non-equivalent elements.

Note

Complexity: At most last1 - first1 applications of the predicate f.

Template Parameters
  • Rng1 – The type of the first source range used (deduced). The iterators extracted from this range type must meet the requirements of an forward iterator.

  • Rng2 – The type of the second source range used (deduced). The iterators extracted from this range type must meet the requirements of an forward iterator.

  • Pred – The type of an optional function/function object to use. Unlike its sequential form, the parallel overload of mismatch requires Pred to meet the requirements of CopyConstructible. This defaults to std::equal_to<>

  • Proj1 – The type of an optional projection function applied to the first range. This defaults to util::projection_identity

  • Proj2 – The type of an optional projection function applied to the second range. This defaults to util::projection_identity

Parameters
  • rng1 – Refers to the first sequence of elements the algorithm will be applied to.

  • rng2 – Refers to the second sequence of elements the algorithm will be applied to.

  • op – The binary predicate which returns true if the elements should be treated as mismatch. The signature of the predicate function should be equivalent to the following:

    bool pred(const Type1 &a, const Type2 &b);
    
    The signature does not need to have const &, but the function must not modify the objects passed to it. The types Type1 and Type2 must be such that objects of types FwdIter1 and FwdIter2 can be dereferenced and then implicitly converted to Type1 and Type2 respectively

  • proj1 – Specifies the function (or function object) which will be invoked for each of the elements of the first range as a projection operation before the actual predicate is invoked.

  • proj2 – Specifies the function (or function object) which will be invoked for each of the elements of the second range as a projection operation before the actual predicate is invoked.

Returns

The mismatch algorithm returns std::pair<FwdIter1, FwdIter2>. The mismatch algorithm returns the first mismatching pair of elements from two ranges: one defined by [first1, last1) and another defined by [first2, last2).