copy.hpp¶

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

namespace hpx

namespace ranges

Functions

template<typename ExPolicy, typename Iter1, typename Sent1, typename FwdIter> hpx::parallel::util::detail::algorithm_result<ExPolicy, hpx::ranges::copy_result<Iter1, Iter>>::type copy(ExPolicy &&policy, Iter1 iter, Sent1 sent, FwdIter dest)¶

Copies the elements in the range, defined by [first, last), to another range beginning at dest.

The assignments in the parallel

copy algorithm invoked with an execution policy object of type sequenced_policy execute in sequential order in the calling thread.

Note

Complexity: Performs exactly last - first assignments.

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 begin source iterators used (deduced). This iterator type must meet the requirements of an forward iterator.
Sent1: The type of the end source iterators used (deduced). This iterator type must meet the requirements of an sentinel for Iter1.
FwdIter: The type of the iterator representing the destination range (deduced). This iterator type must meet the requirements of an forward iterator.

Parameters

policy: The execution policy to use for the scheduling of the iterations.
iter: Refers to the beginning of the sequence of elements the algorithm will be applied to.
sent: Refers to the end of the sequence of elements the algorithm will be applied to.
dest: Refers to the beginning of the destination range.

The assignments in the parallel copy 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.

Return: The copy algorithm returns a hpx::future<ranges::copy_result<FwdIter1, FwdIter> > if the execution policy is of type sequenced_task_policy or parallel_task_policy and returns ranges::copy_result<FwdIter1, FwdIter> otherwise. The copy algorithm returns the pair of the input iterator last and the output iterator to the element in the destination range, one past the last element copied.

template<typename ExPolicy, typename Rng, typename FwdIter> hpx::parallel::util::detail::algorithm_result<ExPolicy, hpx::ranges::copy_result<typename hpx::traits::range_traits<Rng>::iterator_type, FwdIter>>::type copy(ExPolicy &&policy, Rng &&rng, FwdIter dest)¶

Copies the elements in the range rng to another range beginning at dest.

The assignments in the parallel

copy algorithm invoked with an execution policy object of type sequenced_policy execute in sequential order in the calling thread.

Note

Complexity: Performs exactly std::distance(begin(rng), end(rng)) assignments.

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.
Rng: The type of the source range used (deduced). The iterators extracted from this range type must meet the requirements of an input iterator.
FwdIter: The type of the iterator representing the destination range (deduced). This iterator type must meet the requirements of an forward iterator.

Parameters

policy: The execution policy to use for the scheduling of the iterations.
rng: Refers to the sequence of elements the algorithm will be applied to.
dest: Refers to the beginning of the destination range.

The assignments in the parallel copy 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.

Return: The copy algorithm returns a hpx::future<ranges::copy_result<iterator_t<Rng>, FwdIter2>> if the execution policy is of type sequenced_task_policy or parallel_task_policy and returns ranges::copy_result<iterator_t<Rng>, FwdIter2> otherwise. The copy algorithm returns the pair of the input iterator last and the output iterator to the element in the destination range, one past the last element copied.

template<typename ExPolicy, typename FwdIter1, typename Size, typename FwdIter2> hpx::parallel::util::detail::algorithm_result<ExPolicy, hpx::ranges::copy_n_result<FwdIter1, FwdIter2>>::type copy_n(ExPolicy &&policy, FwdIter1 first, Size count, FwdIter2 dest)¶

Copies the elements in the range [first, first + count), starting from first and proceeding to first + count - 1., to another range beginning at dest.

The assignments in the parallel

copy_n algorithm invoked with an execution policy object of type sequenced_policy execute in sequential order in the calling thread.

Note

Complexity: Performs exactly count assignments, if count > 0, no assignments otherwise.

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.
FwdIter1: The type of the source iterators used (deduced). This iterator type must meet the requirements of an forward iterator.
Size: The type of the argument specifying the number of elements to apply f to.
FwdIter2: The type of the iterator representing the destination range (deduced). This iterator type must meet the requirements of an forward iterator.

Parameters

policy: The execution policy to use for the scheduling of the iterations.
first: Refers to the beginning of the sequence of elements the algorithm will be applied to.
count: Refers to the number of elements starting at first the algorithm will be applied to.
dest: Refers to the beginning of the destination range.

The assignments in the parallel copy_n 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.

Return: The copy_n algorithm returns a hpx::future<ranges::copy_n_result<FwdIter1, FwdIter2> > if the execution policy is of type sequenced_task_policy or parallel_task_policy and returns ranges::copy_n_result<FwdIter1, FwdIter2> otherwise. The copy algorithm returns the pair of the input iterator forwarded to the first element after the last in the input sequence and the output iterator to the element in the destination range, one past the last element copied.

template<typename ExPolicy, typename FwdIter1, typename Sent1, typename FwdIter, typename F, typename Proj = hpx::parallel::util::projection_identity> hpx::parallel::util::detail::algorithm_result<ExPolicy, hpx::ranges::copy_if_result<typename hpx::traits::range_traits<Rng>::iterator_type, OutIter>>::type copy_if(ExPolicy &&policy, FwdIter1 iter, Sent1 sent, FwdIter dest, F &&f, Proj &&proj = Proj())¶

Copies the elements in the range, defined by [first, last) to another range beginning at dest. Copies only the elements for which the predicate f returns true. The order of the elements that are not removed is preserved.

The assignments in the parallel

copy_if algorithm invoked with an execution policy object of type sequenced_policy execute in sequential order in the calling thread.

Note

Complexity: Performs not more than std::distance(begin(rng), end(rng)) assignments, exactly std::distance(begin(rng), end(rng)) 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.
FwdIter1: The type of the begin source iterators used (deduced). This iterator type must meet the requirements of an forward iterator.
Sent1: The type of the end source iterators used (deduced). This iterator type must meet the requirements of an sentinel for FwdIter1.
FwdIter: The type of the iterator representing the destination range (deduced). This iterator type must meet the requirements of an output iterator.
F: The type of the function/function object to use (deduced). Unlike its sequential form, the parallel overload of copy_if requires F to meet the requirements of CopyConstructible.
Proj: The type of an optional projection function. This defaults to util::projection_identity

Parameters

policy: The execution policy to use for the scheduling of the iterations.
iter: Refers to the beginning of the sequence of elements the algorithm will be applied to.
sent: Refers to the end of the sequence of elements the algorithm will be applied to.
dest: Refers to the beginning of the destination range.
f: Specifies the function (or function object) which will be invoked for each of the elements in the sequence specified by [first, last).This is an unary predicate which returns true for the required elements. The signature of this predicate should be equivalent to:
```
bool pred(const Type &a);
```
The signature does not need to have const&, but the function must not modify the objects passed to it. The type
Type must be such that an object of type InIter can be dereferenced and then implicitly converted to Type.
proj: Specifies the function (or function object) which will be invoked for each of the elements as a projection operation before the actual predicate is invoked.

The assignments in the parallel copy_if 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.

Return: The copy_if algorithm returns a hpx::future<ranges::copy_if_result<iterator_t<Rng>, FwdIter2>> if the execution policy is of type sequenced_task_policy or parallel_task_policy and returns ranges::copy_if_result<iterator_t<Rng>, FwdIter2> otherwise. The copy_if algorithm returns the pair of the input iterator last and the output iterator to the element in the destination range, one past the last element copied.

template<typename ExPolicy, typename Rng, typename OutIter, typename F, typename Proj = hpx::parallel::util::projection_identity> hpx::parallel::util::detail::algorithm_result<ExPolicy, hpx::ranges::copy_if_result<typename hpx::traits::range_traits<Rng>::iterator_type, OutIter>>::type copy_if(ExPolicy &&policy, Rng &&rng, OutIter dest, F &&f, Proj &&proj = Proj())¶

Copies the elements in the range rng to another range beginning at dest. Copies only the elements for which the predicate f returns true. The order of the elements that are not removed is preserved.

The assignments in the parallel

copy_if algorithm invoked with an execution policy object of type sequenced_policy execute in sequential order in the calling thread.

Note

Complexity: Performs not more than std::distance(begin(rng), end(rng)) assignments, exactly std::distance(begin(rng), end(rng)) 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.
Rng: The type of the source range used (deduced). The iterators extracted from this range type must meet the requirements of an input iterator.
OutIter: The type of the iterator representing the destination range (deduced). This iterator type must meet the requirements of an output iterator.
F: The type of the function/function object to use (deduced). Unlike its sequential form, the parallel overload of copy_if requires F to meet the requirements of CopyConstructible.
Proj: The type of an optional projection function. This defaults to util::projection_identity

Parameters

policy: The execution policy to use for the scheduling of the iterations.
rng: Refers to the sequence of elements the algorithm will be applied to.
dest: Refers to the beginning of the destination range.
f: Specifies the function (or function object) which will be invoked for each of the elements in the sequence specified by [first, last).This is an unary predicate which returns true for the required elements. The signature of this predicate should be equivalent to:
```
bool pred(const Type &a);
```
The signature does not need to have const&, but the function must not modify the objects passed to it. The type
Type must be such that an object of type InIter can be dereferenced and then implicitly converted to Type.
proj: Specifies the function (or function object) which will be invoked for each of the elements as a projection operation before the actual predicate is invoked.

The assignments in the parallel copy_if 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.

Return: The copy_if algorithm returns a hpx::future<ranges::copy_if_result<iterator_t<Rng>, FwdIter2>> if the execution policy is of type sequenced_task_policy or parallel_task_policy and returns ranges::copy_if_result<iterator_t<Rng>, FwdIter2> otherwise. The copy_if algorithm returns the pair of the input iterator last and the output iterator to the element in the destination range, one past the last element copied.