1 files changed, 42 insertions, 0 deletions
diff --git a/src/mongo/platform/float_utils.h b/src/mongo/platform/float_utils.h
new file mode 100644
index 00000000000..64f9a5df231
--- /dev/null
+++ b/src/mongo/platform/float_utils.h
@@ -0,0 +1,42 @@
+/*
+ *    Copyright 2009 10gen Inc.
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+#pragma once
+
+namespace mongo {
+
+    inline bool isNaN(double d) { 
+        return d != d;
+    }
+
+    inline bool isInf(double d, int* sign = 0) {
+        volatile double tmp = d;
+
+        if ((tmp == d) && ((tmp - d) != 0.0)) {
+            if ( sign ) {
+                *sign = (d < 0.0 ? -1 : 1);
+            }
+            return true;
+        }
+        
+        if ( sign ) {
+            *sign = 0;
+        }
+
+        return false;
+    }
+
+}