[ruby-core:108276] [Ruby master Bug#18677] BigDecimal#power (**) returns FloatDomainError when passing an infinite parameter
From:
"nobu (Nobuyoshi Nakada)" <noreply@...>
Date:
2022-04-18 08:57:55 UTC
List:
ruby-core #108276
Issue #18677 has been updated by nobu (Nobuyoshi Nakada).
Assignee set to mrkn (Kenta Murata)
Status changed from Open to Assigned
----------------------------------------
Bug #18677: BigDecimal#power (**) returns FloatDomainError when passing an infinite parameter
https://bugs.ruby-lang.org/issues/18677#change-97298
* Author: dorianmariefr (Dorian Mari辿)
* Status: Assigned
* Priority: Normal
* Assignee: mrkn (Kenta Murata)
* ruby -v: ruby 3.1.1p18 (2022-02-18 revision 53f5fc4236) [x86_64-darwin21]
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
----------------------------------------
Example:
```ruby
> BigDecimal(10) ** BigDecimal("Infinity")
FloatDomainError: Computation results in 'Infinity'
```
Maybe:
```ruby
require "bigdecimal/util"
class BigDecimal < Numeric
def **(other)
if other.infinite? == 1
if self > 1
BigDecimal::INFINITY
elsif self == 1
self
elsif self >= 0
BigDecimal(0)
else
power(other)
end
else
power(other)
end
end
end
def puts_and_eval(string)
puts string
p eval(string)
end
puts_and_eval "10 ** BigDecimal::INFINITY"
puts_and_eval "1 ** BigDecimal::INFINITY"
puts_and_eval "0.1 ** BigDecimal::INFINITY"
puts_and_eval "0 ** BigDecimal::INFINITY"
puts_and_eval "-1 ** BigDecimal::INFINITY"
```
Seems like ruby is doing very different things from math though
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