string_utils.h updated

zoeprieto · Aug 8, 2024 · 99d867e · 99d867e
1 parent 1a9f2bb
commit 99d867e
Showing 1 changed file with 7 additions and 7 deletions.
diff --git a/include/openmc/string_utils.h b/include/openmc/string_utils.h
@@ -28,14 +28,14 @@ bool starts_with(const std::string& value, const std::string& beginning);
 template<typename T>
 inline std::string concatenate(const T& values, const std::string& del = " ")
 {
-  std::ostringstream oss;
+  if (values.size() == 0)
+    return "";
+
+  std::stringstream oss;
   auto it = values.begin();
-  if (it != values.end()) {
-    oss << *it; // Insert the first element without a delimiter
-    ++it;
-  }
-  for (; it != values.end(); ++it) {
-    oss << del << *it;
+  oss << *it++;
+  while (it != values.end()) {
+    oss << del << *it++;
   }
   return oss.str();
 }