* ext/bigdecimal/bigdecimal.c (Init_bigdecimal): add two new constants BigDecimal::INFINITY and BigDecimal::NAN.

* ext/bigdecimal/lib/bigdecimal/math.rb (BigMath.exp): modify the behaviors for infinity arguments as same as Math.exp.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@28533 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

2 files changed, 16 insertions, 0 deletions

diff --git a/test/bigdecimal/test_bigdecimal.rb b/test/bigdecimal/test_bigdecimal.rb
index b622358758..a699d0c488 100644
--- a/test/bigdecimal/test_bigdecimal.rb
+++ b/test/bigdecimal/test_bigdecimal.rb
@@ -709,4 +709,12 @@ class TestBigDecimal < Test::Unit::TestCase
   ensure
     GC.stress = stress
   end
+
+  def test_INFINITY
+    assert(BigDecimal::INFINITY.infinite?, "BigDecimal::INFINITY is not a infinity")
+  end
+
+  def test_NAN
+    assert(BigDecimal::NAN.nan?, "BigDecimal::NAN is not NaN")
+  end
 end
diff --git a/test/bigdecimal/test_bigmath.rb b/test/bigdecimal/test_bigmath.rb
index 453c47ec6b..ae3cb9d5f9 100644
--- a/test/bigdecimal/test_bigmath.rb
+++ b/test/bigdecimal/test_bigmath.rb
@@ -67,6 +67,14 @@ class TestBigMath < Test::Unit::TestCase
     assert_in_epsilon(Math.exp(40), exp(BigDecimal("40"), N))
     assert_in_epsilon(Math.exp(-N), exp(BigDecimal("-20"), N))
     assert_in_epsilon(Math.exp(-40), exp(BigDecimal("-40"), N))
+    begin
+      old_mode = BigDecimal.mode(BigDecimal::EXCEPTION_INFINITY)
+      BigDecimal.mode(BigDecimal::EXCEPTION_INFINITY, false)
+      assert(exp(BigDecimal::INFINITY, N).infinite?, "exp(INFINITY) is not an infinity")
+    ensure
+      #BigDecimal.mode(BigDecimal::EXCEPTION_INFINITY, old_mode)
+    end
+    assert_equal(0.0, exp(-BigDecimal::INFINITY, N))
   end
 
   def test_log