public static T?OrNull <T>(this Opt <T> opt, T?otherVal) where T : struct
{
if (opt.IsSome)
{
return(opt.Val);
}
return(otherVal);
}
public static Opt <V> Ap <T, U, V>(Func <T, U, V> f, Opt <T> v1, Opt <U> v2)
{
if (v1.IsNone)
{
return(Opt <V> .None());
}
if (v2.IsNone)
{
return(Opt <V> .None());
}
return(Opt <V> .Some(f(v1.Val, v2.Val)));
}
public static Opt <T> Some(T val)
{
if (val == null)
{
throw new ArgumentNullException(nameof(val), "Cannot supply a NULL value to the Opt.Some() constructor.");
}
var opt = new Opt <T> {
IsSome = true, _val = val
};
return(opt);
}
public static Opt <T> Some <T>(T val)
{
return(Opt <T> .Some(val));
}
public static Opt <T> None <T>()
{
return(Opt <T> .None());
}