remove using std from cpp

src/tree/model.h

@@ -53,7 +53,7 @@ class TreeModel {
     Param(void) {
       max_depth = 0;
       size_leaf_vector = 0;
-      memset(reserved, 0, sizeof(reserved));
+      std::memset(reserved, 0, sizeof(reserved));
     }
     /*! 
      * \brief set parameters from outside 
@@ -61,6 +61,7 @@ class TreeModel {
      * \param val  value of the parameter
      */
     inline void SetParam(const char *name, const char *val) {
+      using namespace std;
       if (!strcmp("num_roots", name)) num_roots = atoi(val);
       if (!strcmp("num_feature", name)) num_feature = atoi(val);
       if (!strcmp("size_leaf_vector", name)) size_leaf_vector = atoi(val);

src/tree/param.h

@@ -62,6 +62,7 @@ struct TrainParam{
    * \param val  value of the parameter
    */            
   inline void SetParam(const char *name, const char *val) {
+    using namespace std;
     // sync-names
     if (!strcmp(name, "gamma")) min_split_loss = static_cast<float>(atof(val));
     if (!strcmp(name, "eta")) learning_rate = static_cast<float>(atof(val));

src/tree/updater.cpp

@@ -1,7 +1,6 @@
 #define _CRT_SECURE_NO_WARNINGS
 #define _CRT_SECURE_NO_DEPRECATE
 #include <cstring>
-using namespace std;
 #include "./updater.h"
 #include "./updater_prune-inl.hpp"
 #include "./updater_refresh-inl.hpp"
@@ -10,6 +9,7 @@ using namespace std;
 namespace xgboost {
 namespace tree {
 IUpdater* CreateUpdater(const char *name) {
+  using namespace std;
   if (!strcmp(name, "prune")) return new TreePruner();
   if (!strcmp(name, "refresh")) return new TreeRefresher<GradStats>();
   if (!strcmp(name, "grow_colmaker")) return new ColMaker<GradStats>();

src/tree/updater_prune-inl.hpp

@@ -17,6 +17,7 @@ class TreePruner: public IUpdater {
   virtual ~TreePruner(void) {}
   // set training parameter
   virtual void SetParam(const char *name, const char *val) {
+    using namespace std;
     param.SetParam(name, val);
     if (!strcmp(name, "silent")) silent = atoi(val);
   }