[DO NOT MERGE] Lib changes needed

[quinnj]

@Octogonapus, do you happen to know what we need to tweak in the generated bindings to get these examples to work? To spell out the problem as clearly as possible:

• I'm creating a struct like resolver_options = aws_host_resolver_default_options(8, el_group, C_NULL, C_NULL)
• Then trying to call host_resolver = aws_host_resolver_new_default(allocator, resolver_options)

But getting an unsafe_convert error because an instance of aws_host_resolver_default_options can't be convert to Ptr{aws_host_resolver_default_options}. The correct ccall pattern here is to specify the struct pointer type as Ref{aws_host_resolver_default_options} and this fixes my usage.

If you happen to know what we need to tweak in the bindings generation, I can make the changes, just wanted to check since you know the generation process much better than I do.

[Octogonapus]

Your code should be changed to pass resolver_options as a Ref. Complete example:

resolver_options = Ref(aws_host_resolver_default_options(8, el_group, C_NULL, C_NULL))
host_resolver = aws_host_resolver_new_default(allocator, resolver_options)

You'll likely want to do this anyway so that you can properly GC preserve these values as aws_host_resolver_default_options is not mutable.

[quinnj]

Aha! Thanks! Makes sense. I'm trying to switch over code where a lot of the structs were just treated as opaque Ptr{Cvoid}.