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@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.

On Sunday, 21 September 2014 at 03:00:34 UTC, Charles McAnany wrote:
> writefln("%c", '/U0001F0A1'+1); //

The problem here is just that arithmetic converts everything back to integers and writefln is a bit picky about types. You can print it though by casting it back to dchar:

        writefln("%c", cast(dchar)('\U0001F0A1'+1));

My fonts don't support these chars but it should print out if you do that.

On Sun, 21 Sep 2014 03:00:32 +0000
Charles McAnany via Digitalmars-d-learn
<digitalmars-d-learn@puremagic.com> wrote:

can't this help:

  writefln("%c", cast(dchar)('\U0001F0A1'+1));

arichmetics with dchars automatically coerces to int, so you must cast result back to dchar.

On 09/20/2014 08:14 PM, ketmar via Digitalmars-d-learn wrote:

> arichmetics with dchars automatically coerces to int

My unimportant contribution to this thread: It is actually uint in this case. :)

Ali

On Sat, 20 Sep 2014 22:12:52 -0700
Ali Çehreli via Digitalmars-d-learn <digitalmars-d-learn@puremagic.com>
wrote:

> My unimportant contribution to this thread: It is actually uint in this case. :)
ah, sure. i just lost that 'u' somewhere... gotta find it. ;-)

On Sunday, 21 September 2014 at 03:13:19 UTC, Adam D. Ruppe wrote:
>         writefln("%c", cast(dchar)('\U0001F0A1'+1));

A bit less ugly:

writefln("%c", dchar('\U0001F0A1'+1));

On Mon, 22 Sep 2014 01:02:32 +0000
Vladimir Panteleev via Digitalmars-d-learn
<digitalmars-d-learn@puremagic.com> wrote:

> A bit less ugly:
> writefln("%c", dchar('\U0001F0A1'+1));
this won't work in gdc, though: 2.066 it not landed yet.