Declaration for moptimize

[Minch Park]

To implement an ML estimation, I used the moptimize command.
Specifically, the code looks like below:

:function llk (transmorphic M, real rowvector b, real colvector lnf) {
        .
        .
        .
}

:M = moptimize_init()
:moptimize_init_evaluator(M, &llk())
 .
 .
 .
:moptimize(M)

I am now building a Stata command that utilizes the MLE results.
But, I am not sure what type is appropriate for the object "M" above.

For example, in my Mata command, I have to extract a subset of the estimation results as below:

: beta = moptimize_result_coefs(M)[1 .. 3]

When I try to use this command, Mata says that I have to declare the type of M.
But, I cannot find a guide for the object M.
So, what is the object type of M that comes from moptimize_init()?

[Minch Park]

I found that the object M should be transmorphic, and now my command perfectly works with a globally accessible evaluator function llk().