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Function std.range.transposed
Given a range of ranges, returns a range of ranges where the i'th subrange contains the i'th elements of the original subranges.
Prototype
Transposed!RangeOfRanges transposed(RangeOfRanges)( RangeOfRanges rr ) if (isForwardRange!RangeOfRanges && isInputRange!(ElementType!RangeOfRanges) && hasAssignableElements!RangeOfRanges);
Example
import std.algorithm : equal;
int[][] ror = [
[1, 2, 3],
[4, 5, 6]
];
auto xp = transposed(ror);
assert(equal!"a.equal(b)"(xp, [
[1, 4],
[2, 5],
[3, 6]
]));
Example
int[][] x = new int[][2];
x[0] = [1, 2];
x[1] = [3, 4];
auto tr = transposed(x);
int[][] witness = [ [ 1, 3 ], [ 2, 4 ] ];
uint i;
foreach (e; tr)
{
assert(array(e) == witness[i++]);
}
Authors
Andrei Alexandrescu, David Simcha, and Jonathan M Davis. Credit for some of the ideas in building this module goes to Leonardo Maffi.