Julia incorrect with function argument

General Usage
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1

Hi!
Please help me to understand whats wrong with julia logic.
The following code print out:

println(typeof(section))
>> CxxWrap.CxxWrapCore.CxxPtr{Main.CppTypes.ISection}

I wish to write function which take this (and i want to specify its type)
Which also print same (obviously)

function Eg(mat, T::Cdouble)
    println(typeof(mat))
end
>> CxxWrap.CxxWrapCore.CxxPtr{Main.CppTypes.ISection}

But if i add this type - julia will not compile

function Eg(mat :: CxxWrap.CxxWrapCore.CxxPtr{Main.CppTypes.ISection}, T::Cdouble)
    println(typeof(mat))
end

Is it correct? I place a type typed by julia.
I run julia through c++ binding and dont know the exact problem for this.

2

Sorry, im stupid. Found answer when writing this question.
Should add

using CxxWrap

But how to know that from julia embedding?
How to handle julia compile errors with embeddding?