View source code
Display the source code in std/range/package.d from which this
page was generated on github.
Report a bug
If you spot a problem with this page, click here to create a
Bugzilla issue.
Improve this page
Quickly fork, edit online, and submit a pull request for this page.
Requires a signed-in GitHub account. This works well for small changes.
If you'd like to make larger changes you may want to consider using
local clone.
Enum std.range.TransverseOptions
Options for the FrontTransversal
and Transversal
ranges
(below).
enum TransverseOptions
: int { ... }
Enum members
Name | Description |
---|---|
assumeJagged
|
When transversed, the elements of a range of ranges are assumed to have different lengths (e.g. a jagged array). |
assumeNotJagged
|
The transversal assumes, without verifying, that the elements of a range of ranges have all the same length. This option is useful if checking was already done from the outside of the range. |
enforceNotJagged
|
The transversal enforces that the elements of a range of ranges have all the same length (e.g. an array of arrays, all having the same length). Checking is done once upon construction of the transversal range. |
Example
import std .algorithm .comparison : equal;
import std .exception : assertThrown;
auto arr = [[1, 2], [3, 4, 5]];
auto r1 = arr .frontTransversal!(TransverseOptions .assumeJagged);
assert(r1 .equal([1, 3]));
// throws on construction
assertThrown!Exception(arr .frontTransversal!(TransverseOptions .enforceNotJagged));
auto r2 = arr .frontTransversal!(TransverseOptions .assumeNotJagged);
assert(r2 .equal([1, 3]));
// either assuming or checking for equal lengths makes
// the result a random access range
writeln(r2[0]); // 1
static assert(!__traits(compiles, r1[0]));
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
Copyright © 1999-2022 by the D Language Foundation | Page generated by ddox.