[ADT] Pass DerivedT from pointe{e,r}_iterator to iterator_adaptor_base

These were passing the wrong type into iterator_adaptor_base if T was
anything but the default.

llvm-svn: 335698

Author: bogner

llvm/include/llvm/ADT/iterator.h

@@ -288,7 +288,7 @@ template <typename WrappedIteratorT,
               decltype(**std::declval<WrappedIteratorT>())>::type>
 struct pointee_iterator
     : iterator_adaptor_base<
-          pointee_iterator<WrappedIteratorT>, WrappedIteratorT,
+          pointee_iterator<WrappedIteratorT, T>, WrappedIteratorT,
           typename std::iterator_traits<WrappedIteratorT>::iterator_category,
           T> {
   pointee_iterator() = default;
@@ -311,7 +311,7 @@ make_pointee_range(RangeT &&Range) {
 template <typename WrappedIteratorT,
           typename T = decltype(&*std::declval<WrappedIteratorT>())>
 class pointer_iterator
-    : public iterator_adaptor_base<pointer_iterator<WrappedIteratorT>,
+    : public iterator_adaptor_base<pointer_iterator<WrappedIteratorT, T>,
                                    WrappedIteratorT, T> {
   mutable T Ptr;
 

llvm/unittests/ADT/IteratorTest.cpp

@@ -128,6 +128,20 @@ TEST(PointeeIteratorTest, Range) {
     EXPECT_EQ(A[I++], II);
 }
 
+TEST(PointeeIteratorTest, PointeeType) {
+  struct S {
+    int X;
+    bool operator==(const S &RHS) const { return X == RHS.X; };
+  };
+  S A[] = {S{0}, S{1}};
+  SmallVector<S *, 2> V{&A[0], &A[1]};
+
+  pointee_iterator<SmallVectorImpl<S *>::const_iterator, const S> I = V.begin();
+  for (int j = 0; j < 2; ++j, ++I) {
+    EXPECT_EQ(*V[j], *I);
+  }
+}
+
 TEST(FilterIteratorTest, Lambda) {
   auto IsOdd = [](int N) { return N % 2 == 1; };
   int A[] = {0, 1, 2, 3, 4, 5, 6};