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version 2.096.0

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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.

Transposed!(RangeOfRanges,opt) transposed(TransverseOptions opt = TransverseOptions.assumeJagged, RangeOfRanges) (
  RangeOfRanges rr
)
if (isForwardRange!RangeOfRanges && isInputRange!(ElementType!RangeOfRanges) && hasAssignableElements!RangeOfRanges);

Transposed currently defines save, but does not work as a forward range. Consuming a copy made with save will consume all copies, even the original sub-ranges fed into Transposed.

Parameters

NameDescription
opt Controls the assumptions the function makes about the lengths of the ranges (i.e. jagged or not)
rr Range of ranges

Example

import std.algorithm.comparison : 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)
{
    writeln(array(e)); // witness[i++]
}

Authors

Andrei Alexandrescu, David Simcha, Jonathan M Davis, and Jack Stouffer. Credit for some of the ideas in building this module goes to Leonardo Maffi.

License

Boost License 1.0.