use cmath

* avoid using #include <math.h>
* add std:: namespace prefix when calling <cmath> functions

3 files changed, 3 insertions, 5 deletions

diff --git a/fastos/src/tests/prefetchtest.cpp b/fastos/src/tests/prefetchtest.cpp
index efb68be0362..bd86f091f09 100644
--- a/fastos/src/tests/prefetchtest.cpp
+++ b/fastos/src/tests/prefetchtest.cpp
@@ -15,8 +15,6 @@
 
 
 #include <stdlib.h>
-#include <math.h>
-
 #include <vespa/fastos/fastos.h>
 #include "tests.h"
 
diff --git a/fastos/src/tests/timetest.cpp b/fastos/src/tests/timetest.cpp
index b787914ad89..a8db91ed0c8 100644
--- a/fastos/src/tests/timetest.cpp
+++ b/fastos/src/tests/timetest.cpp
@@ -1,6 +1,6 @@
 // Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
 #include <stdlib.h>
-#include <math.h>
+#include <cmath>
 
 #include <vespa/fastos/fastos.h>
 #include "tests.h"
@@ -236,7 +236,7 @@ public:
          double millis = timing.MilliSecs();
          double correct = i;
 
-         Progress((fabs(millis - correct)/correct) < 0.15,
+         Progress((std::fabs(millis - correct)/correct) < 0.15,
                   "Elapsed time measurement: %d",
                   static_cast<int>(millis));
       }
diff --git a/fastos/src/vespa/fastos/timestamp.cpp b/fastos/src/vespa/fastos/timestamp.cpp
index 3f56a37b4e2..0df3ace288f 100644
--- a/fastos/src/vespa/fastos/timestamp.cpp
+++ b/fastos/src/vespa/fastos/timestamp.cpp
@@ -17,7 +17,7 @@ std::string
 TimeStamp::asString(double timeInSeconds)
 {
     double intpart;
-    double fractpart = modf(timeInSeconds, &intpart);
+    double fractpart = std::modf(timeInSeconds, &intpart);
     time_t timeStamp = (time_t)intpart;
     struct tm timeStruct;
     gmtime_r(&timeStamp, &timeStruct);