Managing malloced memory

[jfondren]

On Monday, 11 October 2021 at 12:09:07 UTC, Imperatorn wrote:
> On Wednesday, 6 October 2021 at 18:06:38 UTC, anon wrote:
>> I interface to a C library that gives me a malloced object. 
>> How can I manage that pointer so that it gets freed 
>> automatically.
>> What I've thought of so far:
>> * scope(exit): not an option because I want to return that 
>> memory
>
> Explain again why scope exit isn't an option

The explanation is "I want to return that memory".


```d
int* not_an_option() {
     import core.memory : pureMalloc, pureFree;

     int* p = cast(int*) pureMalloc(int.sizeof);
     scope (exit)
         pureFree(p);
     return p;
}

unittest {
     not_an_option()[0] = 1;
}
```

valgrind: Invalid write of size 4