Memory management

[Dukc]

On Tuesday, 29 September 2020 at 10:57:07 UTC, novice3 wrote:
> Naive newbie question:
>
> Can we have (in theory) in D lang memory management like V lang?
>
I don't know V so can't be sure, but doing it the same way as in 
the examples sounds possible.

The first two calls are easy. D string literals are stored in the 
read-only memory that is uploaded together with the machine code 
before execution. So the naive implementation wouldn't allocate 
any more than the V version.

The third one is more difficult. To allocate without using GC or 
RC means using an owning container, that releases memory when 
exiting the scope. While they can be checked against leaking 
referenced using the `-dip1000` feature, it's practical only when 
the memory has a single clear owner and there is no need to store 
references to it elsewhere. The GC and RC are better as a 
general-purpose solution.

On the other hand, D could avoid all allocation in the third 
example by using ranges. That would cause the printing function 
to figure out the message as it prints.