Unicode arithmetic at run-time

[kiran kumari via Digitalmars-d-learn]

On Sunday, 21 September 2014 at 03:00:34 UTC, Charles McAnany
wrote:
> Friends,
> I note that there are playing cards in unicode:
> http://en.wikipedia.org/wiki/Playing_cards_in_Unicode
>
> They follow a nice pattern, so I can quickly convert from a 
> rank and suit to the appropriate escape sequence in D. I'd like 
> to automate this, but I can't seem to do arithmetic on unicode 
> characters as I could in ascii.
>
> writefln("%c", '/U0001F0A1'); //works fine, ace of spades. 
> Backslash replaced with / for displayability.
> //So logically, this would be the two of spades:
> writefln("%c", '/U0001F0A1'+1); // 
> std.format.FormatException at format.d(1325): integral
>
> Would this be solvable with a mixin (return "//U00001F0A" ~ 
> rank;), or are escape sequences impossible to generate after 
> the source has been lexed by dmd?
>
> I looked in std.uni and std.utf, but they don't seem to want to 
> generate a unicode character from an int, they're more 
> concerned about switching between encodings.
>
> Cheers,
> Charles.

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