src/base/iterator_adapter_test.cc

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#include "base/iterator_adapter.h"

#include <algorithm>
#include <vector>

#include "base/port.h"
#include "testing/base/public/gunit.h"

namespace {

using mozc::AdapterBase;
using mozc::MakeIteratorAdapter;

struct TestStruct {
  int field1;
  int field2;
};

struct GetField1 : public AdapterBase<int> {
  int operator()(const TestStruct *test) const {
    return test->field1;
  }
};

struct GetField2 : public AdapterBase<int> {
  int operator()(const TestStruct *test) const {
    return test->field2;
  }
};

TEST(IteratorAdapterTest, LowerBound) {
  const TestStruct kTestData[] = {
    { 0, 10 },
    { 1, 11 },
    { 2, 12 },
    { 3, 13 },
    { 3, 14 },
    { 4, 14 },
  };

  EXPECT_EQ(
      kTestData + 3,
      lower_bound(
          MakeIteratorAdapter(kTestData, GetField1()),
          MakeIteratorAdapter(kTestData + arraysize(kTestData), GetField1()),
          3).base());

  EXPECT_EQ(
      kTestData + arraysize(kTestData),
      lower_bound(
          MakeIteratorAdapter(kTestData, GetField1()),
          MakeIteratorAdapter(kTestData + arraysize(kTestData), GetField1()),
          12).base());

  EXPECT_EQ(
      kTestData + 2,
      lower_bound(
          MakeIteratorAdapter(kTestData, GetField2()),
          MakeIteratorAdapter(kTestData + arraysize(kTestData), GetField2()),
          12).base());
}

TEST(IteratorAdapterTest, Count) {
  const TestStruct kTestData[] = {
    { 1, 10 },
    { 1, 20 },
    { 2, 30 },
    { 2, 40 },
    { 1, 50 },
  };

  EXPECT_EQ(
      3,
      std::count(
          MakeIteratorAdapter(kTestData, GetField1()),
          MakeIteratorAdapter(kTestData + arraysize(kTestData), GetField1()),
          1));
  EXPECT_EQ(
      2,
      std::count(
          MakeIteratorAdapter(kTestData, GetField1()),
          MakeIteratorAdapter(kTestData + arraysize(kTestData), GetField1()),
          2));
}

}  // namespace