facts-db/cl-compare/README.md

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• Hash : 18f406af
  Author : Thomas de Grivel
  Date : 2023-07-11T13:20:42
  

  README.md

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(compare 'a 'b)
=> -1

(compare 'a "a")
=> -1

(compare '(a b 1) '(a b 2))
=> -1

(defstruct fruit weight price)

(defmethod compare ((a fruit) (b fruit))
  (compare (* (fruit-price a) (fruit-weight a))
           (* (fruit-price b) (fruit-weight b))))

(let ((apple (make-fruit :price 0.3 :weight 100))
      (orange (make-fruit :price 4.5 :weight 1000)))
  (compare apple orange))

=> -1

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• README.md

• cl-compare
  ==========
  
  Compare anything
  ----------------
  
  ```common-lisp
  (compare 'a 'b)
  => -1
  
  (compare 'a "a")
  => -1
  
  (compare '(a b 1) '(a b 2))
  => -1
  ```
  
  ---
  
  Your own order
  --------------
  
  ```common-lisp
  (defstruct fruit weight price)
  
  (defmethod compare ((a fruit) (b fruit))
    (compare (* (fruit-price a) (fruit-weight a))
             (* (fruit-price b) (fruit-weight b))))
  
  (let ((apple (make-fruit :price 0.3 :weight 100))
        (orange (make-fruit :price 4.5 :weight 1000)))
    (compare apple orange))
  
  => -1
  ```
  
  ---
  
  Contribute
  ----------
  
  This project welcomes COMPARE methods for types that have an
  [atomic type specifier][1], with an emphasis on speed and functional
  correctness.
  
  [1]: http://www.lispworks.com/documentation/lw51/CLHS/Body/04_bc.htm
  
  To submit contributions, just fork the project and submit a pull
  request.
  

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