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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?
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You can declare nullable types using Nullable<t> where T is a type. Nullable<int> i = null; A nullable type can represent the correct range of values for its underlying value type, plus an additional null value. For example, Nullable<int> can be assigned any value from -2147483648 to 2147483647, or a null value.
You typically use a nullable value type when you need to represent the undefined value of an underlying value type. For example, a Boolean, or bool , variable can only be either true or false . However, in some applications a variable value can be undefined or missing.
If the HasValue property is true , the value of the current Nullable<T> object can be accessed with the Value property. Otherwise, attempting to access its value throws an InvalidOperationException exception.
The Nullable type allows you to assign a null value to a variable. Nullable types introduced in C#2.0 can only work with Value Type, not with Reference Type. The nullable types for Reference Type is introduced later in C# 8.0 in 2019 so that we can explicitly define if a reference type can or can not hold a null value.
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?.
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