Re: [Swig-user] Multiple interface inheritance C++ and Java

[William S F. <ws...@fu...>]

I mentioned that it is in cvs. You can try it out now:
http://www.swig.org/cvs.html. I put the fixes in place for both Java and
C#, so it looks like you owe me a pint :)

William

Marc Lepage wrote:
> Is this capability (C++ multiple inheritance to Java interfaces) still
> on track for the next release?
> 
> Critically for my use, is it also going to work for C#?
> 
> -----Original Message-----
> From: swi...@li...
> [mailto:swi...@li...] On Behalf Of William S
> Fulton
> Sent: Monday, October 16, 2006 4:19 PM
> To: Dave Ludwig
> Cc: Swig User List
> Subject: Re: [Swig-user] Multiple interface inheritance C++ and Java
> 
> Dave Ludwig wrote:
>>
>> William S Fulton wrote:
>>> Dave Ludwig wrote:
>>>   
>>>> Is it possible for SWIG to correctly interpret C++ classes as 
>>>> interfaces, and thereby allow a class to multiply inherit from them
> in Java?
>>>> In C++ I have the following.  Can I use a certain keyword in SWIG to
> 
>>>> define the first 2 classes as interfaces, allowing the 3rd to
> inherit 
>>>> from both?
>>>>
>>>> class IRemoteSyncIO
>>>>   {
>>>> public:
>>>>   virtual ~IRemoteSyncIO () {}
>>>> protected:
>>>>   IRemoteSyncIO () {}
>>>>    
>>>> private:
>>>>   IRemoteSyncIO (const IRemoteSyncIO&);
>>>>   IRemoteSyncIO& operator= (const IRemoteSyncIO&);
>>>>   };
>>>>
>>>>
>>>> class IRemoteAsyncIO
>>>>   {
>>>> public:
>>>>   virtual ~IRemoteAsyncIO () {}
>>>> protected:
>>>>   IRemoteAsyncIO () {}
>>>>    
>>>> private:
>>>>   IRemoteAsyncIO (const IRemoteAsyncIO&);
>>>>   IRemoteAsyncIO& operator= (const IRemoteAsyncIO&);
>>>>   };
>>>>
>>>> class RemoteMpe : public IRemoteSyncIO, public IRemoteAsyncIO
>>>> {
>>>> ...
>>>> }
>>>>
>>>>     
>>> This should be possible, but hasn't been implemented. Meanwhile you
> can
>>> work around this using the javainterfaces typemap. You can find some
>>> examples in the Examples/test-suite directory and the *_runme.java
> files
>>> in the Examples/test-suite/java subdirectory.
>>>
>>> William
>>>
>>>
>>>   
>> I've been looking through those directories and reading about typemaps
>> for a while.  I don't feel like I'm any closer to working this out.
> The
>> reason probably being I've only been using SWIG for a week or so.  But
> I
>> need to determine if this is possible with SWIG in the short term if
> we
>> are going to move forward with it on this project. 
>> Could someone give a little more detail on how to do this?  Or refer
> me
>> to a good example?
>>
> 
> You really have to jump over hoops right now to get things mapped to a
> Java interface. It might be easier to do some manual wrapping instead.
> However, if you want to know how to do it, I've shown an example below.
> If you have many such classes, you can put some of this code into macros
> for easier re-use. You'll need the cvs version of SWIG which will be the
> basis of the next release (due in a week or two).	
> 
> William
> 
> 
> /* File : example.i */
> %module example
> 
> // Turn the proxy class into an interface
> %typemap(javaclassmodifiers) IRemoteSyncIO "public interface";
> %typemap(javaclassmodifiers) IRemoteAsyncIO "public interface";
> %typemap(javabody) IRemoteSyncIO "";
> %typemap(javabody) IRemoteAsyncIO "";
> %typemap(javafinalize) IRemoteSyncIO "";
> %typemap(javafinalize) IRemoteAsyncIO "";
> %typemap(javadestruct) IRemoteSyncIO "";
> %typemap(javadestruct) IRemoteAsyncIO "";
> 
> // Turn the methods into abstract methods
> %javamethodmodifiers IRemoteSyncIO::syncmethod "abstract public";
> %javamethodmodifiers IRemoteAsyncIO::asyncmethod "abstract public";
> %typemap(javaout) void IRemoteSyncIO::syncmethod ";"
> %typemap(javaout) void IRemoteAsyncIO::asyncmethod ";"
> 
> // Features are inherited by derived classes, so override this
> %javamethodmodifiers RemoteMpe::syncmethod "public"
> %javamethodmodifiers RemoteMpe::asyncmethod "public"
> 
> // Modify multiple inherited base classes into inheriting interfaces
> %typemap(javainterfaces) RemoteMpe "IRemoteSyncIO, IRemoteAsyncIO";
> %typemap(javabase, replace="1") RemoteMpe "";
> 
> 
> %inline %{
> class IRemoteSyncIO
> {
> public:
>   virtual ~IRemoteSyncIO () {}
>   virtual void syncmethod() = 0;
> protected:
>   IRemoteSyncIO () {}
> 
> private:
>   IRemoteSyncIO (const IRemoteSyncIO&);
>   IRemoteSyncIO& operator= (const IRemoteSyncIO&);
> };
> 
> class IRemoteAsyncIO
> {
> public:
>   virtual ~IRemoteAsyncIO () {}
>   virtual void asyncmethod() = 0;
> protected:
>   IRemoteAsyncIO () {}
> 
> private:
>   IRemoteAsyncIO (const IRemoteAsyncIO&);
>   IRemoteAsyncIO& operator= (const IRemoteAsyncIO&);
> };
> 
> class RemoteMpe : public IRemoteSyncIO, public IRemoteAsyncIO
> {
> public:
>   virtual void syncmethod() {}
>   virtual void asyncmethod() {}
> };
> 
> %}
> 
> 
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