As the title says... are they considered different languages? For example if you've written an application using a combination of C++ and Objective-C++ would you consider it to have been written in C++ and Objective-C, C++ and Objective-C++ or all three?
Obviously C and C++ are different languages even though C++ and C are directly compatible, how is the situation with Objective-C++ and Objective-C?
From: https://en.wikipedia.org/wiki/Objective-C#Objective-C.2B.2B
Objective-C++ is a front-end to the GNU Compiler Collection, which can compile source files which use a combination of C++ and Objective-C syntax. Objective-C++ adds to C++ the extensions Objective-C adds to C. As nothing is done to unify the semantics behind the various language features, certain restrictions apply:
- A C++ class cannot derive from an Objective-C class and vice versa.
- C++ namespaces cannot be declared inside an Objective-C declaration.
- Objective-C classes cannot have instance variables of C++ classes which do not have a default constructor or which have one or more virtual methods, but pointers to C++ objects can be used as instance variables without restriction (allocate them with new in the -init method).
- C++ "by value" semantics cannot be applied to Objective-C objects, which are only accessible through pointers.
- An Objective-C declaration cannot be within a C++ template declaration and vice versa. However, Objective-C types, (e.g., Classname *) can be used as C++ template parameters.
Objective-C and C++ exception handling is distinct; the handlers of each cannot handle exceptions of the other type.
- Care must be taken since the destructor calling conventions of Objective-C and C++’s exception run-time models do not match (i.e., a C++ destructor will not be called when an Objective-C exception exits the C++ object’s scope). The new 64-bit runtime resolves this by introducing interoperability with C++ exceptions in this sense
Objective-C++ simply allows Objective-C and C++ code to be mixed (with caveats). It's not really a language on its own so much as a mechanism for allowing the two languages to intermix.
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