Garbage Collection for Systems Programmers

[Ogi]

On Monday, 8 April 2024 at 20:21:35 UTC, Walter Bright wrote:
> The sad thing is if you don't want the GC in your program, 
> don't use 'new'. I can never get this point across.

Also don’t use exceptions, don’t use `lazy`, don’t use built-in 
dynamic and associative arrays, be careful to not accidentally 
allocate with an array literal:
```D
if (arr[0..3] == [0, 1, 2]) { /*…*/ } // bad

int[3] arr2 = [0, 1, 2];
if (arr[0..3] == arr2) { /*…*/ }  // good
```
…be careful to not accidentally create a closure:

```D
int x;
auto r = arr[].map!(e = e*x); // bad

auto r = arr[].zip(x.repeat).map!(t = t[0]*t[1]); // good
```
…and don’t use a huge bulk of Phobos.

Writing no-GC code feels like walking through a minefield. Even 
seemingly innocent things like `DateTime` can use GC internally.