Added range based loops

include/tadah/mlip/st_descriptors_db.h

@@ -38,5 +38,11 @@ struct StDescriptorsDB {
   /** Add StDescriptors to DB */
   void add(const StDescriptors &st_d);
 
+  // Methods to enable range-based for loop
+  std::vector<StDescriptors>::iterator begin();
+  std::vector<StDescriptors>::iterator end();
+  std::vector<StDescriptors>::const_iterator begin() const;
+  std::vector<StDescriptors>::const_iterator end() const;
+
 };
 #endif

src/st_descriptors_db.cpp

@@ -18,3 +18,18 @@ size_t StDescriptorsDB::size() const {
 void StDescriptorsDB::add(const StDescriptors &st_d) {
   st_descs.push_back(st_d);
 }
+std::vector<StDescriptors>::iterator StDescriptorsDB::begin() { 
+    return st_descs.begin(); 
+}
+
+std::vector<StDescriptors>::iterator StDescriptorsDB::end() { 
+    return st_descs.end(); 
+}
+
+std::vector<StDescriptors>::const_iterator StDescriptorsDB::begin() const { 
+    return st_descs.cbegin(); 
+}
+
+std::vector<StDescriptors>::const_iterator StDescriptorsDB::end() const { 
+    return st_descs.cend(); 
+}