icp: small fix related to namespaces

src/icp.cpp

 #include "icp.h"
 
-namespace laserscanutils{
+using namespace laserscanutils;
 
 ICPWrapper::ICPWrapper()
 {
@@ -14,7 +14,5 @@ ICPWrapper::~ICPWrapper()
 
 icp_output ICPWrapper::matchPC(LaserScan &_last_ls, LaserScan &_origin_ls, Eigen::Vector3s &_last_transf)
 {
-    return icp_output{};
-}
-
+    return icp_output();
 }

src/icp.h

@@ -2,12 +2,15 @@
 #include "laser_scan.h"
 
 // using namespace CSM;
-using namespace laserscanutils;
+
+namespace laserscanutils{
+
 struct icp_output{
     Eigen::Vector3s res_transf;
     int num_points;
     int error_points;
 };
+
 class ICPWrapper
 {
     public:
@@ -16,3 +19,5 @@ class ICPWrapper
 
         icp_output matchPC(LaserScan &_last_ls, LaserScan &_reference_ls, Eigen::Vector3s &_last_transf);
 };
+
+}