diff options
| -rw-r--r-- | ChangeLog | 8 | ||||
| -rw-r--r-- | ext/bigdecimal/lib/bigdecimal/util.rb | 4 | ||||
| -rw-r--r-- | test/bigdecimal/test_bigdecimal_util.rb | 13 |
3 files changed, 23 insertions, 2 deletions
@@ -1,3 +1,11 @@ +Wed Jul 27 00:48:00 2011 Kenta Murata <mrkn@mrkn.jp> + + * ext/bigdecimal/lib/bigdecimal/util.rb (Float#to_d): modified for + specifying precision. fixes #5098. [ruby-dev:44210] + + * test/bigdecimal/test_bigdecimal_util.rb: add test for the above + change. + Wed Jul 27 00:45:00 2011 Kenta Murata <mrkn@mrkn.jp> * ext/bigdecimal/lib/bigdecimal/util.rb (Integer#to_d): added diff --git a/ext/bigdecimal/lib/bigdecimal/util.rb b/ext/bigdecimal/lib/bigdecimal/util.rb index 1ec39a30ee..1e4bbbb596 100644 --- a/ext/bigdecimal/lib/bigdecimal/util.rb +++ b/ext/bigdecimal/lib/bigdecimal/util.rb @@ -27,8 +27,8 @@ class Float < Numeric # 0.5.to_d # # => #<BigDecimal:1dc69e0,'0.5E0',9(18)> # - def to_d - BigDecimal(self.to_s) + def to_d(precision=nil) + BigDecimal(self, precision || Float::DIG+1) end end diff --git a/test/bigdecimal/test_bigdecimal_util.rb b/test/bigdecimal/test_bigdecimal_util.rb index 5f03b734cf..87b4f20e99 100644 --- a/test/bigdecimal/test_bigdecimal_util.rb +++ b/test/bigdecimal/test_bigdecimal_util.rb @@ -12,4 +12,17 @@ class TestBigDecimalUtil < Test::Unit::TestCase assert_equal(BigDecimal(1), 1.to_d) assert_equal(BigDecimal(2<<100), (2<<100).to_d) end + + def test_Float_to_d_without_precision + delta = 1.0/10**(Float::DIG + 1) + assert_in_delta(BigDecimal(0.5, Float::DIG+1), 0.5.to_d, delta) + assert_in_delta(BigDecimal(355.0/113.0, Float::DIG+1), (355.0/113.0).to_d, delta) + end + + def test_Float_to_d_with_precision + digits = 5 + delta = 1.0/10**(digits) + assert_in_delta(BigDecimal(0.5, 5), 0.5.to_d(digits), delta) + assert_in_delta(BigDecimal(355.0/113.0, 5), (355.0/113.0).to_d(digits), delta) + end end |