ARSAPI for C

ARSAPI for C gets special coverage in the mentioned book and is used to implement A++ with a rich set of primitive functions in a version that consists of a compiler and a virtual machine.

In ARSAPI for C three datatypes are of significant importance: `PRIM', `CLAM' and `LAMB'. They define three different categories of functions:

• PRIM: Primitive functions in C. These are normal C functions with a specific argument protocol, so that they can also be used in AVIM, the virtual machine language in ARS++.
• CLAM: Lambda-Abstraktionen in C. They represent the core of the implementation of ARS in C.
  • Like an `object' is an encapsulation of attributes and methods in object oriented technology, so is a `clam' an encapsulation of an abstraction with its total environment, including attributes and methods. Such a `clam' is a so-called `first class' object, that can be treated like any other data item: it can be stored in memory, passed to a function as an argument and returned as a value from a function.
• LAMB: A function of this type is a representation of an AVIM lambda abstraction in C. A lambda abstraction in ARS++ will be translated by the compiler ACOMP into a function in the machine language AVIM. The virtual machine language interpreter has to convert this AVIM function into an instance of type `LAMB'.
  A `lamb' is also a `first class' object.

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