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Fix Issue 6004 - std.range.unzip()

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RazvanN7 2017-08-24 10:05:30 +03:00
parent e2a16ccd4d
commit c7dbebe0df
1 changed files with 13 additions and 2 deletions
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15
std/range/package.d
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@ -6282,7 +6282,8 @@ FrontTransversal!(RangeOfRanges, opt) frontTransversal(
/** /**
Given a range of ranges, iterate transversally through the Given a range of ranges, iterate transversally through the
`n`th element of each of the enclosed ranges. `n`th element of each of the enclosed ranges. This function
is similar to `unzip` in other languages.
Params: Params:
opt = Controls the assumptions the function makes about the lengths opt = Controls the assumptions the function makes about the lengths
@ -6518,7 +6519,17 @@ Transversal!(RangeOfRanges, opt) transversal
x[0] = [1, 2]; x[0] = [1, 2];
x[1] = [3, 4]; x[1] = [3, 4];
auto ror = transversal(x, 1); auto ror = transversal(x, 1);
assert(equal(ror, [ 2, 4 ][])); assert(equal(ror, [ 2, 4 ]));
}
/// The following code does a full unzip
@safe unittest
{
import std.algorithm.comparison : equal;
import std.algorithm.iteration : map;
int[][] y = [[1, 2, 3], [4, 5, 6]];
auto z = y.front.walkLength.iota.map!(i => transversal(y, i));
assert(equal!equal(z, [[1, 4], [2, 5], [3, 6]]));
} }
@safe unittest @safe unittest