diff options
Diffstat (limited to 'ext')
| -rw-r--r-- | ext/bigdecimal/lib/bigdecimal/util.rb | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/ext/bigdecimal/lib/bigdecimal/util.rb b/ext/bigdecimal/lib/bigdecimal/util.rb index b27e64c511..b4b02b191d 100644 --- a/ext/bigdecimal/lib/bigdecimal/util.rb +++ b/ext/bigdecimal/lib/bigdecimal/util.rb @@ -17,7 +17,7 @@ end class Float < Numeric # call-seq: - # flt.to_d -> bigdecimal + # flt.to_d(precision=nil) -> bigdecimal # # Convert +flt+ to a BigDecimal and return it. # @@ -83,11 +83,12 @@ end class Rational < Numeric # 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. + # If a negative precision is given, raise ArgumentError. + # The zero precision and implicit precision is deprecated. # # r = (22/7.0).to_r # # => (7077085128725065/2251799813685248) @@ -95,9 +96,12 @@ class Rational < Numeric # # => #<BigDecimal:1a52bd8,'0.3142857142 8571427937 0154144999 105E1',45(63)> # r.to_d(3) # # => #<BigDecimal:1a44d08,'0.314E1',18(36)> - def to_d(precision) - if precision <= 0 + def to_d(precision=0) + if precision < 0 raise ArgumentError, "negative precision" + elsif precision == 0 + warn "zero and implicit precision is deprecated." + precision = BigDecimal.double_fig*2+1 end num = self.numerator BigDecimal(num).div(self.denominator, precision) |