Interface for an object that knows how to swap elements at two positions (a,b).
@see cern.colt.GenericSorting
@author wolfgang.hoschek@cern.ch
@version 1.0, 03-Jul-99
An object that can swap elements whose position is specified by integers
@see Arrays#quickSort(int,int,it.unimi.dsi.fastutil.ints.IntComparator,Swapper)
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