How to share structure with arrays in a single file between C# and C with arrays?

Question

It is possible to define things so that a file that contains a struct definition can be included in both C# and C programs once the differences are taken into account. Most of these differences can be handled but not all. One of those problems is arrays.
Here's a contrived example of a file that can be imported directly into either a C or a C# project. If '__c__' is defined then the file is being imported into a C++ project. If not then the file is being consumed by a C# project. This simple little
thing allows those things that are different between the two environments to be taken into consideration. The one really knotty problem is how to handle arrays. In C, an array can be given a fixed size in a struct. Not so in C#. C# generates a compile time
error. I've been working around it so far by numbering the elements in the C# branch.
// If '__c__' is defined then the file is being included in a C project.
// If not then the file is being included in a C# project.
#if !__c__
// C# can utilize a namespace. C cannot.
namespace CrossPlatform
// C# wants to include the struct in a class.
public class Structs
#endif
#if __c__
// C defines a struct as a named typedef.
typedef struct _RtInfo
#else
// C# wants a struct object with a name.
public struct RtInfo
#endif
// Simple value types and previously defined structures
// can be shared directly between both C and C#.
float f;
#if __c__
// Arrays cannot be shared. C can use arrays with a size.
int v[4];
#else
// but C# cannot deal with sized arrays at all.
int v0;
int v1;
int v2;
int v3;
#endif
#if __c__
// C optionally gives the struct a name.
} CALDATA;
#else
// C# does not do that here.
#endif
#if !__c__
} // end of class.
} // end of namespace block wrapper.
#endif
Richard Lewis Haggard

Answer 1

Hi
Richard.
Would you mind letting us know the result of the suggestion?
I temporarily mark
Viorel’s last response as an answer. You can unmark
it if they provide no help.
Best regards,
Kristin
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