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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

Boost License 1.0.