On Sunday, 18 September 2016 at 08:06:54 UTC, Lutger wrote:
I have a tuple of strings generated at compile time, for example:

  alias names = AliasSeq!("Alice", "Bob");

How is it possible to construct a range of strings from this, in order to use it at runtime with other range algorithms?

For example, this

  chain(names, ["Chuck"])

doesn't work as intended because it expands to

  chain("Alice", "Bob", ["Chuck"])

I want some function makeRange that works like this:

assert(chain(makeRange(names), ["Chuck"]).fold!( (x,y) => x ~ " " ~ y) ==
       "Alice Bob Chuck");

What would be a good way to do that?

Use std.range's 'only' function [1], it takes variadic arguments of the same type and constructs a range consisting of them.


    import std.meta : AliasSeq;
    import std.range : only;
    import std.algorithm.comparison : equal;

    alias names = AliasSeq!("Alice", "Bob");

    auto range = only(names, "Chuck");
    assert(range.equal(["Alice", "Bob", "Chuck"]));

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