implementing Java's Observable in C/C++?

[Digital Puer]

I have to convert some existing Java code into C/C++. One of the
Java classes implements Observable. Can someone suggest how
I might write this in C/C++? I'm thinking I would need something
like function pointers, but I've never used those... Thanks for
any help.

[Peter Ashford]

Digital Puer wrote:

I have to convert some existing Java code into C/C++. One of the
Java classes implements Observable. Can someone suggest how
I might write this in C/C++? I'm thinking I would need something
like function pointers, but I've never used those... Thanks for
any help.

Why would you need function pointers?

Interfaces and base classes can be translated into C++ fairly directly.
Use std::vector to hold your observables and iterate through them when
doing notification.

I don't see where your issue is - I'd do this in C++ in almost exactly
the same way I'd do it in Java (this is a design pattern, not a language
issue)

Peter.

[Steven T. Hatton]

Digital Puer wrote:

I have to convert some existing Java code into C/C++. One of the
Java classes implements Observable. Can someone suggest how
I might write this in C/C++? I'm thinking I would need something
like function pointers, but I've never used those... Thanks for
any help.

Do you know how to implement the event/listener pairs in Java from scratch?
Do the same with C++. If you aren't threading, then you don't need to
worry about /synchronized/ methods. Use javap on the commandline to get a
clear view of the class's interface.
--
p->m == (*p).m == p[0].m
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