Exposing interfaces

[spen...@gmail.com]

Hi,

I would like to expose a C++ abstract base class as an interface that can be implemented by a C# class and passed back into the C++ library. The C++ header would look something like this:

class IInterface
{
public:
virtual ~IInterface()
{
}

virtual int doSomething() = 0;
};

class Concrete
{
public:
Concrete(IInterface *thing);
};

Is this possible?

Thanks,

Chris

[João Matos]

It's possible but not currently supported by CppSharp. Since the feature seemed easy I spent a couple spare minutes here trying to make it work: https://gist.github.com/tritao/97cda97b65ac31d8e211

That simple attempt almost worked but is missing the Internal definitions in the interface. If you add a GenerateClassInternals(@class) call to GenerateInterface it also errors since interfaces cannot contain inner types.

The solution is to either generate the Internal definitions in the extra "interface abstract implementation" class that we must generate to support methods returning interface types or use the same solution that Dimitar implemented to handle multiple inheritance, see the relevant code here: https://github.com/mono/CppSharp/blob/master/src/Generator/Passes/MultipleInheritancePass.cs#L123

Overall I think the feature is useful and can be added quite easily with some more time.

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João Matos

[spen...@gmail.com]

Thanks João, that sounds promising.

Chris