HOWTO: Define managed Enum in C++.NET

Question

 

Hi all,

 

I'm developing class library with C++.NET. I'm defining my enum as follows:

 

Code Block

namespace myNameSpace

{

//Enumeration for all Return Codes

public enum class ReturnCodes

{

FUNC_OK,

FUNC_FAIL,

........

};

 

public ref class myAPI

{

public:

ReturnCode^ FUNC1 ();

ReturnCode^ FUNC2 ();

};}

 

These function are compiled to class library.

Then I'm trying to call these functions from C# code:

 

Code Block

usign myNameSpace;

 

namespace CshNameSpace

{

public class User

{

public void CallF1()

{

myAPI api = new myAPI();

ReturnCodes rc = api.FUNC1();

.....

}

}

}

 

 

I'm receiving compilation error:

Cannot implicitly convert type 'System.Enum' to 'myNameSpace.ReturnCode'. An explicit conversion exists (are you missing a cast?)

 

Compiler recognizes that type of value returned by FUNC1() is System.Enum, while it should be myNameSpace.ReturnCode.

 

What is wrong?

 

Thanks in advance,

Michael.

Answer 1

Change the C++/CLI function signature to:

ReturnCode FUNC1 ();  //i.e., remove the 'hat'

 

The 'hat' is not generally used for value types.  Both 'enum class' and 'enum struct' are value types in C++/CLI.

 

Answer 2

Thanks!

It has solved my issue!