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From Gerrit Binnenmars <gerritbinnenm...@gmail.com>
Subject Re: C++ support
Date Fri, 29 Jul 2016 06:45:44 GMT
Hello Pepijn,

Very interesting and indeed I think Celix can benefit from this. I also
like the fact that the interface between C and C++ is very minimal and
clear in this way.
Looking at the code I noticed you need at least C++11, please state that
explicitly.

Questions that I have:
1. can I (or should I) deploy the C and C++ dependency manager in the same
framework?
2. I notice you use the STL library. Does your code follow the guidelines
for embedded/realtime programming and the use of STL?
    (look on the Internet for discussion using new/delete and memory
fragmentation, std::list<> usage and automatic resizing, no exception
handling, no RTTI)
3. Should the header files not have a distinct extension?

Another point I want to mention to everyone: there has been some activity
to integrate RUST with Celix by Rogier Velting, see
https://github.com/RogierWV/rust-celix


With kind regards,

Gerrit

On Wed, Jul 27, 2016 at 9:51 PM, Pepijn Noltes <pepijnnoltes@gmail.com>
wrote:

> Hi All,
>
> I few day ago I pushed the Apache Celix C++ dependency manager [1] to the
> development branch.
> I have been busy with experimenting how to support other languages to Celix
> for quite some time, but I finally convinced that this is best done with
> use of the dependency manager.
>
> The C++ dependency manager is build on top of the C dependency manager.
> I have chosen to add C++ support using C dependency manager approach
> instead of wrapper the complete Celix API for the following reasons:
>
> 1. The Dependency Manager is arguably the most convenient way to interact
> with services and covers most uses cases.
> 2. It eliminates the necessity to port and maintain the rest of the (large)
> API to C++.
> 3. Because the relatively small codebase needed to build on top of the C
> dependency manager this opens the possibility to support other languages
> (e.g. D, Swift). In my opinion one of the benefits of C as programming
> language it that can act as a common denominator for interoperability
> between a range of languages.
>
> With the C++ dependency manager it is possible to provide C and C++
> services, where C++ services are registered by providing the object
> instance in combination with an interface name (more like in java). It is
> also possible to specify C and/or C++ service dependencies.
> If a service is register as a C++ service the C++ dependency manager will
> ensure that a properties "lang=c++" is added. Also when C++ service
> dependency is specified the C++ dependency manager ensures the filter is
> extended with "(lang=c++)".
>
> I think Celix can benefit, in terms of popularity, from adding C++ as
> supported language. I also still think that Apache Celix should primarily
> focus on providing services in the form of C services (e.g. struct of
> function pointers) as this should be the common denominator.
>
> Any comment or though are welcome. Also feel free to have a more in depth
> look at the C++ dependency manager and let me know what you think.
>
> [1] https://github.com/apache/celix/tree/develop/dependency_manager_cxx
>
> Greetings,
> Pepijn
>

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