int[6] arr1 = [1,2,3,4,5,100]; int[5] arr2 = [6,7,8,9,10]; foreach (ref a, b; lockstep(arr1[], arr2[])) { a += b; } assert(arr1 == [7,9,11,13,15,100]);
Lockstep also supports iterating with an index variable:
int[3] arr1 = [1,2,3]; int[3] arr2 = [4,5,6]; foreach (index, a, b; lockstep(arr1[], arr2[])) { assert(arr1[index] == a); assert(arr2[index] == b); }
Iterate multiple ranges in lockstep using a foreach loop. In contrast to zip it allows reference access to its elements. If only a single range is passed in, the Lockstep aliases itself away. If the ranges are of different lengths and s == StoppingPolicy.shortest stop after the shortest range is empty. If the ranges are of different lengths and s == StoppingPolicy.requireSameLength, throw an exception. s may not be StoppingPolicy.longest, and passing this will throw an exception.
Iterating over Lockstep in reverse and with an index is only possible when s == StoppingPolicy.requireSameLength, in order to preserve indexes. If an attempt is made at iterating in reverse when s == StoppingPolicy.shortest, an exception will be thrown.
By default StoppingPolicy is set to StoppingPolicy.shortest.