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feat: make reseeding of Random at startup configurable (#1161)
* fix: respect quotes in macro expand * feat: make reseeding of Random at startup configurable * refactor: better reseed api
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@ -27,12 +27,28 @@
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(set! s (mod (+ (* s a) c) m))
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(/ s m)))
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(private _)
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(hidden _)
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(doc _ "forces reseeding based on the current time at program start")
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(def _ (do (seed) 0))
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(def _ (do (seed) true))
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(doc gen-seed-at-startup "toggles reseeding the random number generator at startup.")
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(defmacro gen-seed-at-startup [toggle]
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(if toggle
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(eval '(defmodule Random (def _ (do (seed) true))))
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(eval '(defmodule Random (def _ (do false))))))
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(doc gen-seed-at-startup? "checks whether the random number generator was reseeded at startup.
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Use `Dynamic.Random.gen-seed-at-startup?` to check this in dynamic code.")
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(defn gen-seed-at-startup? [] _)
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)
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(defmodule Dynamic
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(defmodule Random
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(doc gen-seed-at-startup? "checks whether the random number generator will be reseeded at startup.")
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(defmacro gen-seed-at-startup? []
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(last (last (s-expr Random._))))))
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(defmodule Int
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(defn random-between [lower upper]
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(let [diff (- upper lower)]
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35
test/random-seed.carp
Normal file
35
test/random-seed.carp
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@ -0,0 +1,35 @@
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(load "Test.carp")
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(use-all Random Test)
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(def reseed-before? (Dynamic.Random.gen-seed-at-startup?))
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(Random.gen-seed-at-startup false)
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(def reseed-after? (Dynamic.Random.gen-seed-at-startup?))
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(Random.gen-seed-at-startup true)
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(def reseed-redo? (Dynamic.Random.gen-seed-at-startup?))
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(Random.gen-seed-at-startup false)
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(deftest test
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(assert-true test
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reseed-before?
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"reseeding is on by default")
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(assert-false test
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reseed-after?
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"reseeding can be disabled")
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(assert-true test
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reseed-redo?
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"reseeding can be re-enabled")
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(assert-op test
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0.658908 ; will always be the initial if not reseeded
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(Random.random)
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"deterministic randomization works as expected"
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Double.approx)
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(assert-false test
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(Random.gen-seed-at-startup?)
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"reseed can be checked statically as well")
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)
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