How to use Nullable types in c++/cli?

问题

I have the following code, which I thought would work:

property Nullable<double> Angle {
    Nullable<double> get() {
        return nullptr;
        }
}

It doesn't. How can I do it? Does c++/CLI even support nullable types?

回答1:

OK, found it, after a lot of hassle:

to return null, just do

return Nullable<double>();

to return non-null:

return Nullable<double>(12321);

It is important to declare the return value as Nullable<double> and not Nullable<double>^, as if you do it, when using other languages as C# and vb.net, you'll see the type as ValueType instead of double?.

来源：https://stackoverflow.com/questions/1457723/how-to-use-nullable-types-in-c-cli