Neat trick - 'with' and unnamed objects + 'with' proposals

[Bill Baxter]

BCS wrote:
> Bill Baxter wrote:
>> BCS wrote:
>>
>>> Bill Baxter wrote:
>>
>>
>>> how about take a trick from "if"
>>>
>>> with(auto name = new someGUIWidget(myParent))
>>> {
>>>    shown = true;
>>>    focusable = false;
>>>    some_global_function(name);
>>> }
>>
>>
>> Yeh, I was actually just thinking that myself, and was disappointed to 
>> find out it doesn't work.  :-(
>>
>> Looking at the spec it seems that's special to 'if'.   It could be 
>> useful for switch(), with() and synchronized(), but it seems it hasn't 
>> been added.
>>
>> --bb
> 
> Ohhh. That would be nice in switch ... and while...

I was thinking 'while' would have issues, because the condition is 
evaluated multiple times.  So I left it off the list.  Maybe it's not a 
problem though.  Just make it equiv to
{
    typeof(condition()) x;
    while(x = condition()) {
        // do stuff
    }
}

--bb