Variables with scoped destruction in closures

[Steven Schveighoffer via Digitalmars-d-learn]

On 10/14/16 6:18 AM, Nordlöw wrote:
> The following code
>
>
> import std.algorithm.iteration : filter;
> import std.algorithm.mutation : move;
> import std.range : iota;
>
> static private struct S
> {
>     import core.memory : GC;
>     @disable this(this);
>
>     this(int x)
>     {
>         _ptr = cast(typeof(_ptr))GC.malloc((*_ptr).sizeof);
>         *_ptr = x;
>     }
>
>     ~this() { GC.free(_ptr); }  // scoped destruction

Note: no matter what solution you can come up with, having the GC 
destroy this struct, and the destructor attempting to free the pointer, 
is going to result in errors.

Instead, you should use C malloc/free here.

This is what RefCounted does.

-Steve