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A foreign function interface (FFI) is a mechanism by which a program written in one programming language can call routines or make use of services written or compiled in another one. An FFI is often used in contexts where calls are made into a binary dynamic-link library.
The Go standard library uses interfaces to provide genericity in several places, including the input/output system that is based on the concepts of Reader and Writer. [74]: 282–283 Besides calling methods via interfaces, Go allows converting interface values to other types with a run-time type check.
Due to the C++ language not having a dedicated keyword to declare interfaces, the following C++ example uses inheritance from a pure abstract base class. For most purposes, this is functionally equivalent to the interfaces provided in other languages, such as Java [4]: 87 and C#. [5]: 144
awk – used for text file manipulation. sed – parses and transforms text SQL – has only a few keywords and not all the constructs needed for a full programming language [ a ] – many database management systems extend SQL with additional constructs as a stored procedure language
int foo; //foo might be defined somewhere in this file extern int bar; //bar must be defined in some other file In Pascal and other Wirth programming languages, it is a general rule that all entities must be declared before use, and thus forward declaration is necessary for mutual recursion, for instance.
An interface description language or interface definition language (IDL) is a generic term for a language that lets a program or object written in one language communicate with another program written in an unknown language.
Interface injection, where the dependency's interface provides an injector method that will inject the dependency into any client passed to it. In some frameworks, clients do not need to actively accept dependency injection at all. In Java, for example, reflection can make private attributes public when testing and inject services directly. [30]
Franca applies model transformation techniques to interoperate with various interface description languages (e.g., D-Bus Introspection language, Apache Thrift IDL, Fibex Services). Franca is a powerful framework for definition and transformation of software interfaces.