diff --git a/libcxx/include/string b/libcxx/include/string
--- a/libcxx/include/string
+++ b/libcxx/include/string
@@ -812,6 +812,14 @@
         std::__debug_db_insert_c(this);
     }
 
+    _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 iterator __make_iterator(pointer __p) {
+        return iterator(this, __p);
+    }
+
+    _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 iterator __make_const_iterator(const_pointer __p) {
+        return const_iterator(this, __p);
+    }
+
 public:
   _LIBCPP_TEMPLATE_DATA_VIS static const size_type npos = -1;
 
@@ -1028,16 +1036,16 @@
 
     _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
     iterator begin() _NOEXCEPT
-        {return iterator(this, __get_pointer());}
+        {return __make_iterator(__get_pointer());}
     _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
     const_iterator begin() const _NOEXCEPT
-        {return const_iterator(this, __get_pointer());}
+        {return __make_const_iterator(__get_pointer());}
     _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
     iterator end() _NOEXCEPT
-        {return iterator(this, __get_pointer() + size());}
+        {return __make_iterator(__get_pointer() + size());}
     _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
     const_iterator end() const _NOEXCEPT
-        {return const_iterator(this, __get_pointer() + size());}
+        {return __make_const_iterator(__get_pointer() + size());}
 
     _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
     reverse_iterator rbegin() _NOEXCEPT
diff --git a/libcxx/include/vector b/libcxx/include/vector
--- a/libcxx/include/vector
+++ b/libcxx/include/vector
@@ -685,9 +685,9 @@
     _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void __append(size_type __n);
     _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void __append(size_type __n, const_reference __x);
     _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI
-    iterator       __make_iter(pointer __p) _NOEXCEPT;
+    iterator       __make_iter(pointer __p) _NOEXCEPT { return iterator(this, __p); }
     _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI
-    const_iterator __make_iter(const_pointer __p) const _NOEXCEPT;
+    const_iterator __make_iter(const_pointer __p) const _NOEXCEPT { return const_iterator(this, __p); }
     _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void __swap_out_circular_buffer(__split_buffer<value_type, allocator_type&>& __v);
     _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI pointer __swap_out_circular_buffer(__split_buffer<value_type, allocator_type&>& __v, pointer __p);
     _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void __move_range(pointer __from_s, pointer __from_e, pointer __to);
@@ -1376,7 +1376,7 @@
 typename vector<_Tp, _Allocator>::iterator
 vector<_Tp, _Allocator>::begin() _NOEXCEPT
 {
-    return iterator(this, this->__begin_);
+    return __make_iter(this->__begin_);
 }
 
 template <class _Tp, class _Allocator>
@@ -1385,7 +1385,7 @@
 typename vector<_Tp, _Allocator>::const_iterator
 vector<_Tp, _Allocator>::begin() const _NOEXCEPT
 {
-    return const_iterator(this, this->__begin_);
+    return __make_iter(this->__begin_);
 }
 
 template <class _Tp, class _Allocator>
@@ -1394,7 +1394,7 @@
 typename vector<_Tp, _Allocator>::iterator
 vector<_Tp, _Allocator>::end() _NOEXCEPT
 {
-    return iterator(this, this->__end_);
+    return __make_iter(this->__end_);
 }
 
 template <class _Tp, class _Allocator>
@@ -1403,7 +1403,7 @@
 typename vector<_Tp, _Allocator>::const_iterator
 vector<_Tp, _Allocator>::end() const _NOEXCEPT
 {
-    return const_iterator(this, this->__end_);
+    return __make_iter(this->__end_);
 }
 
 template <class _Tp, class _Allocator>
@@ -1587,8 +1587,7 @@
     this->__destruct_at_end(std::move(__p + 1, this->__end_, __p));
     if (!__libcpp_is_constant_evaluated())
         this->__invalidate_iterators_past(__p - 1);
-    iterator __r = iterator(this, __p);
-    return __r;
+    return __make_iter(__p);
 }
 
 template <class _Tp, class _Allocator>
@@ -1608,8 +1607,7 @@
         if (!__libcpp_is_constant_evaluated())
             this->__invalidate_iterators_past(__p - 1);
     }
-    iterator __r = iterator(this, __p);
-    return __r;
+    return __make_iter(__p);
 }
 
 template <class _Tp, class _Allocator>
@@ -1663,7 +1661,7 @@
         __v.push_back(__x);
         __p = __swap_out_circular_buffer(__v, __p);
     }
-    return iterator(this, __p);
+    return __make_iter(__p);
 }
 
 template <class _Tp, class _Allocator>
@@ -1693,7 +1691,7 @@
         __v.push_back(std::move(__x));
         __p = __swap_out_circular_buffer(__v, __p);
     }
-    return iterator(this, __p);
+    return __make_iter(__p);
 }
 
 template <class _Tp, class _Allocator>
@@ -1725,7 +1723,7 @@
         __v.emplace_back(std::forward<_Args>(__args)...);
         __p = __swap_out_circular_buffer(__v, __p);
     }
-    return iterator(this, __p);
+    return __make_iter(__p);
 }
 
 template <class _Tp, class _Allocator>
@@ -1766,7 +1764,7 @@
             __p = __swap_out_circular_buffer(__v, __p);
         }
     }
-    return iterator(this, __p);
+    return __make_iter(__p);
 }
 
 template <class _Tp, class _Allocator>
@@ -1803,14 +1801,14 @@
         }
         catch (...)
         {
-            erase(iterator(this, __old_last), end());
+            erase(__make_iter(__old_last), end());
             throw;
         }
 #endif // _LIBCPP_NO_EXCEPTIONS
     }
     __p = std::rotate(__p, __old_last, this->__end_);
-    insert(iterator(this, __p), std::make_move_iterator(__v.begin()),
-                                std::make_move_iterator(__v.end()));
+    insert(__make_iter(__p), std::make_move_iterator(__v.begin()),
+                             std::make_move_iterator(__v.end()));
     return begin() + __off;
 }
 
@@ -1855,7 +1853,7 @@
             __p = __swap_out_circular_buffer(__v, __p);
         }
     }
-    return iterator(this, __p);
+    return __make_iter(__p);
 }
 
 template <class _Tp, class _Allocator>