Scheme In One Defun (or Scheme In One Day) is a small-footprint implementation of the Scheme programming language, written in C and designed to be embedded inside C programs. It was originally written by Professor George J. Carrette at Boston University as a demonstration in a laboratory.

Features [link]

• SIOD implements the original version of Scheme from the Lambda Papers, but it does not implement any of the modern language standards.
• SIOD represents a very early use of conservative garbage collection in a Lisp interpreter, a technique which was later copied by SCM and Guile.
• Compilation is implemented by emitting a fixed machine code prologue followed by a fast-loading binary representation of the parse tree to be interpreted.

Applications [link]

• GIMP used SIOD as its primary extension language, Script-Fu, until version 2.4 was released.^[1]
• SIAG (Scheme in a grid) is a spreadsheet application using SIOD as a base.

References [link]

1. ^ "GIMP - Script-Fu Migration Guide". gimp.org. https://www.gimp.org/docs/script-fu-update.html. Retrieved November 12, 2011. 

External links [link]

• The SIOD home page
• SIOD CodePlex page

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