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Language binding

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Title: Language binding  
Author: World Heritage Encyclopedia
Language: English
Subject: ISO/IEC JTC 1/SC 24, Application binary interface, Cocoa (API), Qt (software), Component Object Model
Collection: Compilers, Computer Libraries
Publisher: World Heritage Encyclopedia

Language binding

In computing, a binding from a programming language to a library or operating system service is an application programming interface (API) providing glue code to use that library or service in a particular programming language.

Binding generally refers to a mapping of one thing to another. In the context of software libraries, bindings are wrapper libraries that bridge two programming languages so that a library written for one language can be used in another language.[1] Many software libraries are written in system programming languages such as C or C++; in order to use these libraries from another (usually higher-level) language such as Java, Common Lisp, Python or Lua, a binding to the library must be created in that language, possibly requiring the recompilation of the language's code depending on the amount of modification necessary.[2] However, most languages offer an interface to foreign functions, such as Python's and OCaml's ctypes, and Embeddable Common Lisp's cffi and uffi.[3][4][5]

For example, Python bindings are used when an already existing C library written for some purpose is to be used from Python. Another example is libsvn, which is written in C and provides an API for accessing Subversion; in order to access Subversion from within Java code, libsvnjavahl can be used, which depends on libsvn being installed and acts as a bridge between the Java programming language and libsvn, thus providing an API that invokes functions from libsvn to do the real work.[6]

Software reuse is a major motivation for creating library bindings, rather than reimplementing the library in several languages. Another is the impossibility of implementing certain algorithms efficiently in high-level languages.

See also


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  5. ^
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External links

  • JTC1/SC22/WG11 - Binding Techniques, an ISO standard for language bindings
  • What is a language binding?

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