How to free memory ater use of "new" to allocate it.

[Steven Schveighoffer]

On 7/16/23 11:58 PM, Alain De Vos wrote:
> Maybe code above works when you enforce an Garbage-collection-run ?
> 
> Code below works fine. So you cannot use "new" but must use malloc?
> 
> ```
> 
> import std.stdio:writefln;
> import object: destroy;
> import core.memory: GC;
> import core.stdc.stdlib: malloc,free;
> 
> 
> void dofun(){
>     auto pa=cast(int *)malloc(1000*int.sizeof);
>     writefln("%12x",pa);
>     auto a=pa[0..1000];
>     free(a.ptr);
> }
> 
> int main(){
>      dofun();
>     auto pb=cast(int *)malloc(1000*int.sizeof);
>     writefln("%12x",pb);
>     auto b=pb[0..1000];
>     free(b.ptr);
>     return 0;
> 
> }
> 
> ```

Notice how you didn't call `destroy(a)` there. If you did, then 
`free(a)` would be equivalent to `free(null)`, which would do nothing.

-Steve