Mac Apps That Use Garbage Collection Must Move to ARC

[deadalnix via Digitalmars-d]

On Thursday, 26 February 2015 at 04:11:42 UTC, Walter Bright 
wrote:
> On 2/25/2015 6:57 PM, deadalnix wrote:
>> You seems to avoid the important part of my message : write 
>> barrier tend to be
>> very cheap on immutable data. Because, as a matter of fact, 
>> you don't write
>> immutable data (in fact you do to some extent, but the amount 
>> of write is minimal.
>>
>> There is no reason not to leverage this for D, and java 
>> comparison are
>> irrelevant on the subject as java does not have the concept of 
>> immutability.
>>
>> The same way, we can use the fact that TL data are not 
>> supposed to refers to
>> each others.
>
> Of course, you don't pay a write barrier cost when you don't 
> write to data, whether it is immutable or not is irrelevant.

It DOES matter as user tends to write way more mutable data than 
immutable ones. Pretending otherwise is ridiculous.