068random.mu.html « html - mu - Soul of a tiny new machine. More thorough tests → More comprehensible and rewrite-friendly software → More resilient society.

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(require "charterm.rkt")
(provide (all-from-out "charterm.rkt"))

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html> <head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <title>Mu - 068random.mu</title> <meta name="Generator" content="Vim/7.4"> <meta name="plugin-version" content="vim7.4_v2"> <meta name="syntax" content="none"> <meta name="settings" content="use_css,pre_wrap,no_foldcolumn,expand_tabs,prevent_copy="> <meta name="colorscheme" content="minimal"> <style type="text/css">  </style> <script type='text/javascript'>  </script> </head> <body> <pre id='vimCodeElement'> def random generator:&:stream:num -> result:num, fail?:bool, generator:&:stream:num [ local-scope load-ingredients { break-if generator # generator is 0? use real random-number generator result <- real-random reply result, 0/false } result, fail?, generator <- read generator ] # helper for tests def assume-random-numbers -> result:&:stream:num [ local-scope load-ingredients # compute result-len, space to allocate in result result-len:num <- copy 0 { _, arg-received?:bool <- next-ingredient break-unless arg-received? result-len <- add result-len, 1 loop } rewind-ingredients result-data:&:@:num <- new number:type, result-len idx:num <- copy 0 { curr:num, arg-received?:bool <- next-ingredient break-unless arg-received? *result-data <- put-index *result-data, idx, curr idx <- add idx, 1 loop } result <- new-stream result-data ] scenario random-numbers-in-scenario [ local-scope source:&:stream:num <- assume-random-numbers 34, 35, 37 1:num/raw, 2:bool/raw <- random source 3:num/raw, 4:bool/raw <- random source 5:num/raw, 6:bool/raw <- random source 7:num/raw, 8:bool/raw <- random source memory-should-contain [ 1 <- 34 2 <- 0 # everything went well 3 <- 35 4 <- 0 # everything went well 5 <- 37 6 <- 0 # everything went well 7 <- 0 # empty result 8 <- 1 # end of stream ] ] </pre> </body> </html>