Time to kill T() as (sometimes) working T.init alias ?

[Andrei Alexandrescu]

On 12/11/12 2:19 AM, monarch_dodra wrote:
> On Tuesday, 11 December 2012 at 03:09:53 UTC, Dan wrote:
>> On Tuesday, 11 December 2012 at 01:47:38 UTC, Walter Bright wrote:
>>> On 12/10/2012 10:40 AM, Dan wrote:
>>>> For something as simple as this would you introduce COW?
>>>
>>> Yes.
>>
>> Any D examples showing the pattern in action with structs? I did not
>> see anything in the index of TDPL on COW except one reference
>> regarding strings. If it is a better approach I would like to know
>> more about how it is done and the trade-offs. Some of the responses
>> refer to having to check on every access, so is that not tough to manage?
>>
>> Thanks
>> Dan
>
> Here is a example of using COW for a simple object that wraps
> nothing more than an int:
[snip]

Walter and I discussed that it should be possible to automate the 
dupIfNeeded() (I call it ensureUnique()) calls like this:

* If a method is const or immutable, leave as is
* For all other methods, insert a ensureUnique() automatically in the 
prolog code

For this to work, the state must be private and all primitives must be 
implemented via methods (as opposed to free functions).


Andrei