I would like to call the `getDetTime`

function from IBM Docs on a model, in order to get the amount of deterministic ticks that have elapsed during a call to `optimize!`

. I cannot figure out how to use the new CPLEX.jl API to call this C function. This is my current code:

```
# set up the model m in direct mode
optimize!(m)
env = backend(m).env
dettime_P = Ref{Cint}()
CPLEX.CPXgetdettime(env, dettime_P)
```

This returns:

```
MethodError: no method matching unsafe_convert(::Type{Ptr{Float64}}, ::Base.RefValue{Int32})
Closest candidates are:
unsafe_convert(!Matched::Type{Ptr{Nothing}}, ::Base.RefValue{T}) where T at refvalue.jl:30
unsafe_convert(::Type{T}, !Matched::T) where T<:Ptr at essentials.jl:391
unsafe_convert(::Type{Ptr{T}}, !Matched::Ptr{Tuple{Vararg{T,N}}}) where {N, T} at refpointer.jl:136
```

How do I fix this?