LWG3364 Initialize data members of ranges and their iterators

Author: Dawn Perchik

source/ranges.tex

@@ -4264,7 +4264,7 @@
     // \ref{range.take.while.sentinel}, class template \tcode{take_while_view::\exposid{sentinel}}
     template<bool> class @\exposid{sentinel}@;                      // \expos
 
-    V @\exposid{base_}@;                                            // \expos
+    V @\exposid{base_}@ = V();                                      // \expos
     @\placeholder{semiregular-box}@<Pred> @\exposid{pred_}@; @\itcorr[-1]@                       // \expos
 
   public:
@@ -4451,8 +4451,8 @@
       return s < c ? 0 : s - c;
     }
   private:
-    V @\exposid{base_}@;                                    // \expos
-    range_difference_t<V> @\exposid{count_}@;               // \expos
+    V @\exposid{base_}@ = V();                              // \expos
+    range_difference_t<V> @\exposid{count_}@ = 0;           // \expos
   };
 
   template<class R>
@@ -4557,7 +4557,7 @@
     { return ranges::end(@\exposid{base_}@); }
 
   private:
-    V @\exposid{base_}@;                                            // \expos
+    V @\exposid{base_}@ = V();                                      // \expos
     @\placeholder{semiregular-box}@<Pred> @\exposid{pred_}@; @\itcorr[-1]@                       // \expos
   };
 
@@ -6047,7 +6047,7 @@
     using @\exposid{base-t}@ = conditional_t<Const, const V, V>;    // \expos
     friend @\exposid{iterator}@<!Const>;
 
-    iterator_t<@\exposid{base-t}@> @\exposid{current_}@;
+    iterator_t<@\exposid{base-t}@> @\exposid{current_}@ = iterator_t<@\exposid{base-t}@>();
   public:
     using iterator_category = typename iterator_traits<iterator_t<@\exposid{base-t}@>>::iterator_category;
     using value_type = remove_cvref_t<tuple_element_t<N, range_value_t<@\exposid{base-t}@>>>;