[Vala] how to initialize a static struct ?

[picca <picca synchrotron-soleil Fr>]

Hello

I have a struct like this

public struct Lattice {
        public Parameter a;
        public Parameter b;
        public Parameter c;
        public Parameter alpha;
        public Parameter beta;
        public Parameter gamma;
}

the Parameter is also a struct with only a doubles.

So I try to create a default struct for the Lattice

public static Lattice default = {
{1.0}, {1.0}, {1.0}, {90.}, {90.}, {90.}
};

but vala complaine saying hkl-lattice.vala:1.49-1.49: error: syntax
error, expected identifier
public static Lattice default = {
                                ^


how can I create a static Lattice and use it in other classes ?

Thanks

Frederic