HPX - High Performance ParalleX

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Function template replace_copy

hpx::parallel::v1::replace_copy

Synopsis

// In header: <hpx/parallel/algorithms/replace.hpp>


template<typename ExPolicy, typename InIter, typename OutIter, typename T> 
  unspecified replace_copy(ExPolicy && policy, InIter first, InIter last, 
                           OutIter dest, T const & old_value, 
                           T const & new_value);

Description

Copies the all elements from the range [first, last) to another range beginning at dest replacing all elements satisfying a specific criteria with new_value.

[Note] Note

Complexity: Performs exactly last - first applications of the predicate.

The assignments in the parallel replace_copy algorithm invoked with an execution policy object of type sequential_execution_policy execute in sequential order in the calling thread.

The assignments in the parallel replace_copy algorithm invoked with an execution policy object of type parallel_execution_policy or parallel_task_execution_policy are permitted to execute in an unordered fashion in unspecified threads, and indeterminately sequenced within each thread.

Parameters:

dest

Refers to the beginning of the destination range.

first

Refers to the beginning of the sequence of elements the algorithm will be applied to.

last

Refers to the end of the sequence of elements the algorithm will be applied to.

new_value

Refers to the new value to use as the replacement.

old_value

Refers to the old value of the elements to replace.

policy

The execution policy to use for the scheduling of the iterations.

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.

InIter

The type of the source iterators used (deduced). This iterator 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.

T

The type of the old and new values to replace (deduced).

Returns:

The replace_copy algorithm returns a hpx::future<OutIter> if the execution policy is of type sequential_task_execution_policy or parallel_task_execution_policy and returns OutIter otherwise. The replace_copy algorithm returns the output iterator to the element in the destination range, one past the last element copied.


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