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Extreme C
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Integration with C++ can be assumed as the easiest. C++ can be thought of as an object-oriented extension to C. A C++ compiler produces similar object files to those that a C compiler produces. Therefore, a C++ program can load and use a C shared object library easier than any other programming language. In other words, it doesn't matter whether a shared object file is the output of a C or C++ project; both can be consumed by a C++ program. The only thing that can be problematic in some cases is the C++ name mangling feature that is described in Chapter 2, Compilation and Linking. As a reminder, we'll briefly review it in the following section.
To elaborate more on this, we should say that symbol names corresponding to functions (both global and member functions in classes) are mangled in C++. Name mangling is mainly there to support namespaces and function overloading, which are missing in C. Name mangling is enabled by default...