what's wrong with my class?

[Brian Schott via Digitalmars-d-learn]

On Wednesday, 4 May 2016 at 23:19:08 UTC, Jonathan Villa wrote:
> What I'm doing wrong? :<

All right. D's type system is marking the `Session` constructor 
as `shared`. This makes the check `static if 
(is(typeof(result.__ctor(args))))` in std.conv.emplace fail 
because `result` is a non-shared `Session`. `emplace` is used by 
`make` to actually initialize the memory returned by `malloc`, 
which is why you care about it here. The solution to this is to 
tell `make` that you want it to return a `shared Session`. Once 
you do this the type checks should pass.

tldr: `return Mallocator.instance.make!(shared Session)(_parent, 
id_user);`