1IMMUTABLE-STRUCT

Simple library that encourage the use of functional programming + pattern matching.

• defstruct --- provides truely nondestructive structure + integrateswell to the pattern matchers (either optima or trivia).
• ftype --- shorthand expression of declaim ftype

1.1macro defstruct (name-and-options &rest slots)

A variation of defstruct, with read-only slots and automatically defined constructor.

Read-only, Noninterned Slot Name

Standard :read-only feature in cldoes not prohibit the use of slot-value.

Constructor Function with the Same Syntax as that of Pattern Matcher

(<name>&optional <slots...>). No keyword argument.

1.2macro ftype (name-or-names &rest types)

Abbreviation of (declaim (ftype (function (<types...>) <type>) <name-or-names...>)). In a smart implementation like sbcl, using ftype declaration is preferred over the and (declare (type ...)).

Besides, defun and ftype both have 5 characters and gives cleaner code.

(ftype my+ fixnum fixnum fixnum)
(defun my+ (a b) (+ a b))

1.3Dependencies

This library is at least tested on implementation listed below:

• SBCL 1.2.8 on X86-64 Linux 3.13.0-45-generic (author's environment)

Also, it depends on the following libraries:

Trivia by me

alexandria

Alexandria is a collection of portable public domain utilities.

2Copyright

Copyright (c) 2015 Masataro Asai (guicho2.71828@gmail.com)

3License

Licensed under the LLGPL License.