On 10/13/2011 01:46 PM, Steven Schveighoffer wrote:
On Thu, 13 Oct 2011 06:57:09 -0400, Cheng Wei <riverch...@gmail.com> wrote:

== Quote from Steven Schveighoffer (schvei...@yahoo.com)'s article
On Wed, 12 Oct 2011 09:46:57 -0400, Trass3r <u...@known.com> wrote:
>> I believe that the primary reasoning for allowing the implicit
>> conversion
>> between int and dchar is so that code like this
>>
>> dchar c = 'a' + 7;
>
> That's a '+' though, not a '~'.
Jonathan meant this better example ;)
string s = "hello";
s ~= 'a' + 7;

It's still fine if '~' does not allow implicit casting but '+' does.
'a' + 7 -> 'h' which is already a dchar. So it can be appended to s
without casting.

A + B where the types of A and B are integral goes through integer
promotion rules, inherited from C. Like them or not, they are very
unlikely to change. This means dchar + int promotes to int, not dchar.

Actually uint afaik.


I think requiring a cast to go from int to dchar would be fine. It's not
a very common operation, and it clearly causes novice issues.


Another argument for requiring an explicit cast is that not every int can be converted to a valid dchar.








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