range_init 使用distance判断迭代器之间距离

ccjimmy777 · Jan 7, 2023 · b56bbbf · b56bbbf
1 parent e64c1cc
commit b56bbbf
Showing 1 changed file with 3 additions and 3 deletions.
diff --git a/MyTinySTL/vector.h b/MyTinySTL/vector.h
@@ -603,9 +603,9 @@ template <class Iter>
 void vector<T>::
 range_init(Iter first, Iter last)
 {
-  const size_type init_size = mystl::max(static_cast<size_type>(last - first),
-                                         static_cast<size_type>(16));
-  init_space(static_cast<size_type>(last - first), init_size);
+  const size_type len = mystl::distance(first, last);
+  const size_type init_size = mystl::max(len, static_cast<size_type>(16));
+  init_space(len, init_size);
   mystl::uninitialized_copy(first, last, begin_);
 }