[Issue 8851] std.string.join should allow 'char' as joiner

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=8851



--- Comment #3 from monarchdodra at gmail.com 2012-10-19 02:39:28 PDT ---
(In reply to comment #1)
> I expect that this stems from the stupidity of character literals defaulting to
> char rather than dchar, and when you couple that with the fact that templates
> always use the _exact_ type of what you give them, it's going to try and
> instantiate join with a separator of char, which doesn't work with ranges of
> dchar. I'm not sure how you'd go about fixing that.

I investigated, and that's not it.

It's *just* that std.array.join, like std.algorithm.joiner, expects the
separator to be a range.

The enhancement request here would be for both "std.array.join"
std.algorithm.joiner" to accept a single element as a separator.

In the meantime, of course, a simple workaround is to just "join([sep])".

I think this needlessly allocates a 1 element array though, no?

--------
On a side note, the current restrictions in join are overly restrictive,
requiring an *exact* ElementType match, making this illegal:

   int[] sep = [1];
   double[] z = [[0.1], [0.2]].join(sep);

The implementation actually perfectly supports it. As a matter of fact, joiner
supports it. I'll see into relaxing the restraints for now, and taking the
opportunity to investigate using an element as a separator.

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