minor refactoring

1 files changed, 5 insertions, 8 deletions

diff --git a/src/tools.cc b/src/tools.cc
index 95c28d6..1b6e28a 100644
--- a/src/tools.cc
+++ b/src/tools.cc
@@ -1,42 +1,39 @@
-/**  --------------------------------------------------------------------
+/**
  *  @file  tools.cc
  *  @brief  Implementation of miscellaneous tools.
  *  @author Andreas Aardal Hanssen
  *  @date 2002-2005
- *  ------------------------------------------------------------------ **/
+ */
+
 #include "tools.h"
 
 #include <cstring>
 
 #include <errno.h>
 
-using namespace ::std;
 using namespace Binc;
+using std::string;
 
-//------------------------------------------------------------------------
 Tools::Tools(void) {}
 
-//------------------------------------------------------------------------
 Tools &Tools::getInstance(void)
 {
   static Tools tools;
   return tools;
 }
 
-//------------------------------------------------------------------------
 void Tools::setenv(const string &key, const string &value) const
 {
   char *c = strdup((key + "=" + value).c_str());
   putenv(c);
 }
 
-//------------------------------------------------------------------------
 string Tools::getenv(const string &key) const
 {
   static const string NIL = "";
 
   const char *c = ::getenv((char *)key.c_str());
-  if (c == 0)
+  if (c == nullptr)
     return NIL;
   else
     return string(c);