Would you pay for GC?

rikki cattermole rikki at cattermole.co.nz
Tue Jan 25 08:24:22 UTC 2022

On 25/01/2022 8:22 PM, Elronnd wrote:
> On Tuesday, 25 January 2022 at 07:13:41 UTC, Paulo Pinto wrote:
>> ARC will also not compete, unless one goes the extra mile of making 
>> the compiler ARC aware, elide retain/release calls, do cascade 
>> deletions in background threads, take care on cascade deletions to 
>> avoid stack overflows on destructor calls, provide multicore friendly 
>> versions of them,.....
> Indeed.  See Bacon et al, 'Unified Theory of Garbage Collection': 
> increasingly sophisticated RC approaches tracing (and vice versa).  So 
> it's a bit strange to assume we can do one but not the other.  And 
> tracing makes a better starting point due to the generational hypothesis.

RC shines for when deterministic destruction is required.

So that is when you have any external resource bound to a D type.

But it is horrible as a language default. Not all types like say a 
pointer or a slice should be bound to any sort of memory management 
strategy in a native language.

It is very expensive compared to a GC. Due to the constant cache 
invalidations going on.

I want to get RC properly in D without having to rely on a struct 
wrapper. That way the compiler can know that eliding of calls can take 
place. Plus if its in the language, we can get const string type too 
with classes and all!

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