Merging C++ code with objective c

[foslacocoa]

Hi,

I want to know that whether C++ code can be merged with objective c or not ?

[Kalimba]

Originally Posted by foslacocoa

Hi,

I want to know that whether C++ code can be merged with objective c or not ?

To some extent, yes, since C++ and Obj-C share the common ancestor, C. But there are many, many syntactical differences between the languages that would make "merging" difficult and time-consuming.

Xcode can build projects comprised of a mix of C++ and Obj-C source files, so you can use existing C++ code (or continue writing new C++ code) as long as you build an interface layer back to Obj-C wherever needed.

[Mr Jack]

Or if you rename your .cpp files to .mm, they will compile as Obj-C++ and can call both C++ and Obj-C code directly. I suggest a thin layer of Obj-C++ files as interface between the two personally.

[mobileben]

It's relatively easy to intermix C++ and Obj-C. There are a few drawbacks due to syntax. For example if you were to do something like:

int myArray = new int[[objCClass length]];

The compiler doesn't like this. So you end up doing something like:

int count = [objCClass length];
int myArray = new int[count];

Our projects intermix the two, with a heavy bias towards C++. As Mr Jack stated, you can rename the file. The other method is to use Get Info on the files and change the file type to sourcecode.cpp.objcpp. This works for any code file type (like .m).

We prefer this method ourselves mainly because all our code also runs on the PC. So it allows us to use .cpp the majority of time and use .m when we have truly iPhone specific classes or files, like delegates.