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version 2.079.0

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Function std.range.chain

Spans multiple ranges in sequence. The function chain takes any number of ranges and returns a Chain!(R1, R2,...) object. The ranges may be different, but they must have the same element type. The result is a range that offers the front, popFront, and empty primitives. If all input ranges offer random access and length, Chain offers them as well.

auto auto chain(Ranges...) (
  Ranges rs
)
if (Ranges.length > 0 && allSatisfy!(isInputRange, staticMap!(Unqual, Ranges)) && !is(CommonType!(staticMap!(ElementType, staticMap!(Unqual, Ranges))) == void));

If only one range is offered to Chain or chain, the Chain type exits the picture by aliasing itself directly to that range's type.

Parameters

NameDescription
rs the input ranges to chain together

Returns

An input range at minimum. If all of the ranges in rs provide a range primitive, the returned range will also provide that range primitive.

See Also

only to chain values to a range

Example

import std.algorithm.comparison : equal;

int[] arr1 = [ 1, 2, 3, 4 ];
int[] arr2 = [ 5, 6 ];
int[] arr3 = [ 7 ];
auto s = chain(arr1, arr2, arr3);
writeln(s.length); // 7
writeln(s[5]); // 6
assert(equal(s, [1, 2, 3, 4, 5, 6, 7][]));

Example

Range primitives are carried over to the returned range if all of the ranges provide them 

import std.algorithm.comparison : equal;
import std.algorithm.sorting : sort;

int[] arr1 = [5, 2, 8];
int[] arr2 = [3, 7, 9];
int[] arr3 = [1, 4, 6];

// in-place sorting across all of the arrays
auto s = arr1.chain(arr2, arr3).sort;

assert(s.equal([1, 2, 3, 4, 5, 6, 7, 8, 9]));
assert(arr1.equal([1, 2, 3]));
assert(arr2.equal([4, 5, 6]));
assert(arr3.equal([7, 8, 9]));

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.