How to use D without the GC ?

[bachmeier]

On Wednesday, 12 June 2024 at 20:37:36 UTC, drug007 wrote:
> On 12.06.2024 21:57, bachmeier wrote:
>> On Wednesday, 12 June 2024 at 18:36:26 UTC, Vinod K Chandran 
>> wrote:
>>> On Wednesday, 12 June 2024 at 15:33:39 UTC, bachmeier wrote:
>>>> A SafeRefCounted example with main marked @nogc:
>>>>
>>>> ```
>>>> import std;
>>>> import core.stdc.stdlib;
>>>>
>>>> struct Foo {
>>>>   double[] data;
>>>>   double * ptr;
>>>>   alias data this;
>>>>
>>>>   @nogc this(int n) {
>>>>     ptr = cast(double*) malloc(n*double.sizeof);
>>>>     data = ptr[0..n];
>>>>     printf("Data has been allocated\n");
>>>>   }
>>>>  }
>>>>
>>>> ```
>>>>
>>> Why not just use `ptr` ? Why did you `data` with `ptr` ?
>> 
>> Try `foo[10] = 1.5` and `foo.ptr[10] = 1.5`. The first 
>> correctly throws an out of bounds error. The second gives 
>> `Segmentation fault (core dumped)`.
>
> I think you can use data only because data contains data.ptr

Yes, but you get all the benefits of `double[]` for free if you 
do it that way, including the more concise foo[10] syntax.