Adding namespace nlsr
diff --git a/src/nlsr_conf_param.hpp b/src/nlsr_conf_param.hpp
index 817bf2e..941dbe7 100644
--- a/src/nlsr_conf_param.hpp
+++ b/src/nlsr_conf_param.hpp
@@ -3,6 +3,8 @@
 
 #include<iostream>
 
+namespace nlsr {
+
 using namespace std;
 
 class ConfParameter{
@@ -206,4 +208,6 @@
 std::ostream&
 operator << (std::ostream &os, ConfParameter &cfp);
 
+} // namespace nlsr
+
 #endif