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* ext/bigdecimal/lib/bigdecimal/util.rb: Improve documentation. Patch

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by Pete Higgins.  [Ruby 1.9 - Bug #4746]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@31653 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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drbrain 2011-05-20 17:51:16 +00:00
parent 18d29d79a2
commit 5bae5b4ae2
2 changed files with 50 additions and 18 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
Sat May 21 02:51:01 2011 Eric Hodel <drbrain@segment7.net>
* ext/bigdecimal/lib/bigdecimal/util.rb: Improve documentation. Patch
by Pete Higgins. [Ruby 1.9 - Bug #4746]
Sat May 21 02:44:10 2011 Eric Hodel <drbrain@segment7.net>
* ext/bigdecimal/lib/bigdecimal/jacobian.rb: Document isEqual. Patch

63
ext/bigdecimal/lib/bigdecimal/util.rb
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@ -1,35 +1,50 @@
#
# BigDecimal utility library.
#
# To use these functions, require 'bigdecimal/util'
#
# The following methods are provided to convert other types to BigDecimals:
#
# String#to_d -> BigDecimal
# Float#to_d -> BigDecimal
# Rational#to_d -> BigDecimal
#
# The following method is provided to convert BigDecimals to other types:
#
# BigDecimal#to_r -> Rational
#
# ----------------------------------------------------------------------
#
class Float < Numeric
# call-seq:
# flt.to_d -> bigdecimal
#
# Convert +flt+ to a BigDecimal and return it.
#
# require 'bigdecimal'
# require 'bigdecimal/util'
#
# 0.5.to_d
# # => #<BigDecimal:1dc69e0,'0.5E0',9(18)>
#
def to_d
BigDecimal(self.to_s)
end
end
class String
# call-seq:
# string.to_d -> bigdecimal
#
# Convert +string+ to a BigDecimal and return it.
#
# require 'bigdecimal'
# require 'bigdecimal/util'
#
# "0.5".to_d
# # => #<BigDecimal:1dc69e0,'0.5E0',9(18)>
#
def to_d
BigDecimal(self)
end
end
class BigDecimal < Numeric
# call-seq:
# a.to_digits -> string
#
# Converts a BigDecimal to a String of the form "nnnnnn.mmm".
# This method is deprecated; use BigDecimal#to_s("F") instead.
#
# require 'bigdecimal'
# require 'bigdecimal/util'
#
# d = BigDecimal.new("3.14")
# d.to_digits
# # => "3.14"
def to_digits
if self.nan? || self.infinite? || self.zero?
self.to_s
@ -42,7 +57,19 @@ class BigDecimal < Numeric
end
class Rational < Numeric
# Converts a Rational to a BigDecimal
# call-seq:
# r.to_d -> bigdecimal
# r.to_d(sig) -> bigdecimal
#
# Converts a Rational to a BigDecimal. Takes an optional parameter +sig+ to
# limit the amount of significant digits.
#
# r = (22/7.0).to_r
# # => (7077085128725065/2251799813685248)
# r.to_d
# # => #<BigDecimal:1a52bd8,'0.3142857142 8571427937 0154144999 105E1',45(63)>
# r.to_d(3)
# # => #<BigDecimal:1a44d08,'0.314E1',18(36)>
def to_d(nFig=0)
num = self.numerator.to_s
if nFig<=0