unittests/ADT/DepthFirstIteratorTest.cpp

   1 //=== llvm/unittest/ADT/DepthFirstIteratorTest.cpp - DFS iterator tests ---===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "llvm/ADT/DepthFirstIterator.h"
  10 #include "TestGraph.h"
  11 #include "gtest/gtest.h"
  12
  13 using namespace llvm;
  14
  15 namespace llvm {
  16
  17 template <typename T> struct CountedSet {
  18   typedef typename SmallPtrSet<T, 4>::iterator iterator;
  19
  20   SmallPtrSet<T, 4> S;
  21   int InsertVisited = 0;
  22
  23   std::pair<iterator, bool> insert(const T &Item) {
  24     InsertVisited++;
  25     return S.insert(Item);
  26   }
  27
  28   size_t count(const T &Item) const { return S.count(Item); }
  29
  30   void completed(T) { }
  31 };
  32
  33 template <typename T> class df_iterator_storage<CountedSet<T>, true> {
  34 public:
  35   df_iterator_storage(CountedSet<T> &VSet) : Visited(VSet) {}
  36
  37   CountedSet<T> &Visited;
  38 };
  39
  40 TEST(DepthFirstIteratorTest, ActuallyUpdateIterator) {
  41   typedef CountedSet<Graph<3>::NodeType *> StorageT;
  42   typedef df_iterator<Graph<3>, StorageT, true> DFIter;
  43
  44   Graph<3> G;
  45   G.AddEdge(0, 1);
  46   G.AddEdge(0, 2);
  47   StorageT S;
  48   for (auto N : make_range(DFIter::begin(G, S), DFIter::end(G, S)))
  49     (void)N;
  50
  51   EXPECT_EQ(3, S.InsertVisited);
  52 }
  53 }