const as default for variables

deadalnix via Digitalmars-d digitalmars-d at
Mon Mar 16 12:51:59 PDT 2015

On Monday, 16 March 2015 at 14:40:51 UTC, Zach the Mystic wrote:
> On Sunday, 15 March 2015 at 20:09:56 UTC, deadalnix wrote:
>> On Sunday, 15 March 2015 at 07:44:50 UTC, Walter Bright wrote:
>>> "const ref" can tell the optimizer that that path for a ref 
>>> counted object cannot alter its ref count.
>> That is not clear why. const ref is supposed to protect 
>> against escaping when ref does not ?
> There are two cases here. One is when the reference is copied 
> to new variable, which would actually break const because the 
> reference count of the original data would have to be 
> incremented (which is a separate issue).

I think we should provide library solution for this kind of 

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