![]() XS subroutine to perform the mergesort algorithm. Accept only one single argument as input. XS subroutine to perform the heapsort algorithm. XS subroutine to perform the quicksort algorithm. String # cmp, do the compare on string ixsortĪlias on xsort method but force type to integer comparison same usage as xsort sxsortĪlias on xsort method but force type to string comparison same usage as xsort quick_sort '' or 'cmp' ) by setting this attribute to one of these two values integer #, is the default operator if not specified You can specify which kind of sort you are expecting ( i.e. Perl # use standard perl sort method instead of c implementation type Xsort( $list ) or xsort( list => $list ) algorithm ĭefault value is quick you can use any of the following choices quick # quicksort ![]() Provide a reference to an array if only one argument is provided can be ommit my $list = ![]() ( view optimization section for tricks ) list Its rather blunt control of the underlying algorithm may not persist into future Perls, but the ability to characterize the input or output in implementation independent ways quite probably will.ĪPI that allow you to use one of the XS subroutines. But benchmarks indicated that for some inputs, on some platforms, the original quicksort was faster.ĥ.8 has a sort pragma for limited control of the sort. In 5.7, the quicksort implementation was replaced with a stable mergesort algorithm whose worst-case behavior is O(NlogN). Although quicksort's run time is O(NlogN) when averaged over all arrays of length N, the time can be O(N**2), quadratic behavior, for some inputs.) (A stable sort preserves the input order of elements that compare equal. That algorithm was not stable, so could go quadratic. Perl 5.6 and earlier used a quicksort algorithm to implement sort. This is not an algorithm by itself, but provides an easy way to disable all XS code by switching back to a regular sort. Provide one implementation of insertion sort, but prefer using either any of the previous algorithm or even the perl internal sort. Read for more informations insertion sort It's still a better choice than the internal perl sort. Stable sort algorithm, that means that in any case the time to compute the result will be similar. In pratice it provides the best results even if in worst case heap sort will be a better choice.Ī little slower in practice than quicksort but provide a better worst case runtime. Quicksort provides an average good solution, even if in some case it will be better to use a different choice. Quicksort has been chosen as the default method ( even if it s not a stable algorithm ), you can also consider to use heapsort which provides a worst case in "n log n".Ĭhoosing the correct algorithm depends on distribution of your values and size of your list. It's goal is not to replace the internal sort subroutines, but to provide a better alternative in some specifics cases : - no need to specify a comparison operator - sorting a mono dimension list ALGORITHMS Sort can only be used on one dimension list of integers or strings. This module provides several common sort algorithms implemented as XS. $sorted = Sort::XS::quick_sort_str( $list ) # use direct XS subroutines to sort array of strings # prefer using directly one of the XS subroutines # if you use very small arrays ( ~ 10 rows ) Or xsort( list => $list, algorithm => 'merge', type => 'string' ) Or xsort( list => $list, algorithm => 'heap', type => 'integer' ) Or xsort( $list, algorithm => 'quick', type => integer ) Or xsort( list => $list, algorithm => 'quick' ) My $sorted = xsort( $list ) or ixsort( $list ) # personalize your xsort with some options Sort::XS - a ( very ) fast XS sort alternative for one dimension list SYNOPSIS use Sort::XS qw/xsort/
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