From 548b5143db2c3d701520671ef1413cf3c39fcedf Mon Sep 17 00:00:00 2001
From: matz <matz@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Mon, 12 Jun 2000 07:48:31 +0000
Subject: 2000-06-12

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@741 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 numeric.c | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

(limited to 'numeric.c')

diff --git a/numeric.c b/numeric.c
index f84bdede1f..589f06bfc0 100644
--- a/numeric.c
+++ b/numeric.c
@@ -679,6 +679,40 @@ flo_zero_p(num)
     return Qfalse;
 }
 
+static VALUE flo_is_nan_p(num)
+     VALUE num;
+{     
+
+  double value = RFLOAT(num)->value;
+
+  return isnan(value) ? Qtrue : Qfalse;
+}
+
+static VALUE flo_is_infinite_p(num)
+     VALUE num;
+{     
+  double value = RFLOAT(num)->value;
+
+  if (isinf(value)) {
+    return INT2FIX( value < 0 ? -1 : +1 );
+  }
+
+  return Qnil;
+}
+
+
+static VALUE flo_is_finite_p(num)
+     VALUE num;
+{     
+  double value = RFLOAT(num)->value;
+
+  if (isinf(value) || isnan(value))
+    return Qfalse;
+  
+  return Qtrue;
+}
+
+
 static VALUE
 to_integer(val)
     VALUE val;
@@ -1570,4 +1604,8 @@ Init_Numeric()
     rb_define_method(rb_cFloat, "floor", flo_floor, 0);
     rb_define_method(rb_cFloat, "ceil", flo_ceil, 0);
     rb_define_method(rb_cFloat, "round", flo_round, 0);
+
+    rb_define_method(rb_cFloat, "nan?",      flo_is_nan_p, 0);
+    rb_define_method(rb_cFloat, "infinite?", flo_is_infinite_p, 0);
+    rb_define_method(rb_cFloat, "finite?",   flo_is_finite_p, 0);
 }
-- 
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