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[ruby/bigdecimal] Document precision=0 and ndigits=0 for converting from Float

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https://github.com/ruby/bigdecimal/commit/4f0894c6c0
This commit is contained in:
Maciej Rzasa 2022-07-29 11:33:23 +02:00 committed by git
parent a58cbddd57
commit b8e804e410
2 changed files with 8 additions and 1 deletions
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3
ext/bigdecimal/bigdecimal.c
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@ -3500,6 +3500,9 @@ rb_convert_to_BigDecimal(VALUE val, size_t digs, int raise_exception)
* in the value, the result is rounded to that number of digits,
* according to the current rounding mode; see BigDecimal.mode.
*
* When +ndigits+ is 0, the number of digits to correctly represent a float number
* is determined automatically.
*
* Returns +value+ converted to a \BigDecimal, depending on the type of +value+:
*
* - Integer, Float, Rational, Complex, or BigDecimal: converted directly:

6
ext/bigdecimal/lib/bigdecimal/util.rb
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@ -33,12 +33,16 @@ class Float < Numeric
#
# Returns the value of +float+ as a BigDecimal.
# The +precision+ parameter is used to determine the number of
# significant digits for the result (the default is Float::DIG).
# significant digits for the result. When +precision+ is set to +0+,
# the number of digits to represent the float being converted is determined
# automatically.
# The default +precision+ is +0+.
#
# require 'bigdecimal'
# require 'bigdecimal/util'
#
# 0.5.to_d # => 0.5e0
# 1.234.to_d # => 0.1234e1
# 1.234.to_d(2) # => 0.12e1
#
# See also BigDecimal::new.