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version 2.080.0

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Function std.algorithm.iteration.joiner

Lazily joins a range of ranges with a separator. The separator itself is a range. If a separator is not provided, then the ranges are joined directly without anything in between them (often called flatten in other languages).

auto auto joiner(RoR, Separator) (
  RoR r,
  Separator sep
)
if (isInputRange!RoR && isInputRange!(ElementType!RoR) && isForwardRange!Separator && is(ElementType!Separator : ElementType!(ElementType!RoR)));

auto auto joiner(RoR) (
  RoR r
)
if (isInputRange!RoR && isInputRange!(ElementType!RoR));

Parameters

NameDescription
r An input range of input ranges to be joined.
sep A forward range of element(s) to serve as separators in the joined range.

Returns

A range of elements in the joined range. This will be a forward range if both outer and inner ranges of RoR are forward ranges; otherwise it will be only an input range.

See also

std.range.chain, which chains a sequence of ranges with compatible elements into a single range.

Example

import std.algorithm.comparison : equal;
import std.conv : text;

assert(["abc", "def"].joiner.equal("abcdef"));
assert(["Mary", "has", "a", "little", "lamb"]
    .joiner("...")
    .equal("Mary...has...a...little...lamb"));
assert(["", "abc"].joiner("xyz").equal("xyzabc"));
assert([""].joiner("xyz").equal(""));
assert(["", ""].joiner("xyz").equal("xyz"));

Authors

Andrei Alexandrescu

License

Boost License 1.0.