Re: Adding a 3rd party C++ library to ObjectiveC project
Re: Adding a 3rd party C++ library to ObjectiveC project
- Subject: Re: Adding a 3rd party C++ library to ObjectiveC project
- From: Todd Heberlein <email@hidden>
- Date: Fri, 07 Jun 2013 10:08:24 -0700
On Jun 7, 2013, at 8:42 AM, Koen van der Drift <email@hidden> wrote:
> I'd like to use an open source 3rd party C++ library in my Objective C project, but I have no idea how to do this. I pulled the library from github, and it contains the source, docs, and a bunch of cmake files. There is no compiled library and the docs are very scarce.
>
> Any suggestions how I can add and use this in my project? Can I even use C++ within my ObjectiveC project?
The short answer is "Yes, you can use C++ libraries with your Cocoa apps."
The long answer is, well, a bit longer.
(1) You have to build the C++ library first. That is sometimes tricky, especially for many open source projects. Once that is done, you are probably two thirds of the way there.
(2) In your Xcode project, you need to set your target to (a) locate the relevant header files and (b) link against the relevant library (standard stuff).
(3) You need to turn your Objective C source code files that reference any of the C++ objects to Objective-C++ code (basically change the file from a ".m" file to a ".mm" file).
In general, I find I don't include C++ objects in my Objective C objects but instead include pointers to them. Then in the -init method (or appropriate place) I allocate the C++ object. This need may have changed over the years, but it has been what I've been using for several years.
Todd
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