> On Oct 15, 2019, at 9:40 AM, Richard Charles via Cocoa-dev 
> <cocoa-dev@lists.apple.com> wrote:
> 
> 2. Another option is Swift but it has zero integration with C++. So this is 
> really not a choice at all.

Swift integrates with C. So you can declare C APIs to your C++ codebase, and 
call those from Swift. This does mean writing a lot of C++ wrapper code in the 
form of extern "C" functions that call your C++ methods. Which is admittedly 
extra work, but hardly rocket science.

For context: I work on a database library[1] implemented in C++ that provides 
exactly such a C API, which is then used by higher-layer frameworks written in 
Objective-C, Swift, Java, and C#. So I know this works and is not an 
unreasonable amount of work. Here [2] is an example source file if you want to 
see what it looks like. (Note that some of the boilerplate is to catch 
exceptions thrown by the C++ layer; if your C++ doesn't use exceptions, you 
don't need that.)

—Jens

[1]: https://github.com/couchbase/couchbase-lite-core
[2]: 
https://github.com/couchbase/couchbase-lite-core/blob/master/C/c4DocExpiration.cc
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