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Function std.range.only

Assemble values into a range that carries all its elements in-situ.

Useful when a single value or multiple disconnected values must be passed to an algorithm expecting a range, without having to perform dynamic memory allocation.

As copying the range means copying all elements, it can be safely returned from functions. For the same reason, copying the returned range may be expensive for a large number of arguments.

Prototype

auto only(Values...)(
  Values values
)
if (!is(CommonType!Values == void) || Values.length == 0);

Example

import std.algorithm;
import std.uni;

assert(equal(only('♡'), "♡"));
assert([1, 2, 3, 4].findSplitBefore(only(3))[0] == [1, 2]);

assert(only("one", "two", "three").joiner(" ").equal("one two three"));

string title = "The D Programming Language";
assert(filter!isUpper(title).map!only().join(".") == "T.D.P.L");

Authors

Andrei Alexandrescu, David Simcha, and Jonathan M Davis. Credit for some of the ideas in building this module goes to Leonardo Maffi.

License

Boost License 1.0.

Comments