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Make random.rand work with Ordinal (#20043)

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* Make `random.rand` work with `Ordinal`

* Add changelog entry

* It's fine to cast to char
This commit is contained in:
Amjad Ben Hedhili 2022-07-16 21:51:27 +01:00 • committed by GitHub
commit cf78c02b70
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2 changed files with 10 additions and 6 deletions
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15
lib/pure/random.nim
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@ -353,8 +353,8 @@ proc rand*[T: Ordinal or SomeFloat](x: HSlice[T, T]): T =
result = rand(state, x)
proc rand*[T: SomeInteger](t: typedesc[T]): T =
## Returns a random integer in the range `low(T)..high(T)`.
proc rand*[T: Ordinal](t: typedesc[T]): T =
## Returns a random Ordinal in the range `low(T)..high(T)`.
##
## If `randomize <#randomize>`_ has not been called, the sequence of random
## numbers returned from this proc will always be the same.
@ -368,13 +368,16 @@ proc rand*[T: SomeInteger](t: typedesc[T]): T =
## that accepts a slice
runnableExamples:
randomize(567)
type E = enum a, b, c, d
if false: # implementation defined
assert rand(int8) == -42
assert rand(uint32) == 578980729'u32
assert rand(range[1..16]) == 11
assert rand(E) in a..d
assert rand(char) in low(char)..high(char)
assert rand(int8) in low(int8)..high(int8)
assert rand(uint32) in low(uint32)..high(uint32)
assert rand(range[1..16]) in 1..16
# pending csources >= 1.4.0 or fixing https://github.com/timotheecour/Nim/issues/251#issuecomment-831599772,
# use `runnableExamples("-r:off")` instead of `if false`
when T is range:
when T is range or T is enum or T is bool:
result = rand(state, low(T)..high(T))
else:
result = cast[T](state.next)