[Sync] Move //sync to //components/sync.

sync/internal_api/public/util/immutable_unittest.cc

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "sync/internal_api/public/util/immutable.h"
-
-#include <algorithm>
-#include <cstddef>
-#include <deque>
-#include <list>
-#include <set>
-#include <string>
-#include <vector>
-
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-#include "testing/gtest/include/gtest/gtest.h"
-
-namespace syncer {
-
-// Helper class that keeps track of the token passed in at
-// construction and how many times that token is copied.
-class TokenCore : public base::RefCounted<TokenCore> {
- public:
-  explicit TokenCore(const char* token) : token_(token), copy_count_(0) {}
-
-  const char* GetToken() const { return token_; }
-
-  void RecordCopy() { ++copy_count_; }
-
-  int GetCopyCount() const { return copy_count_; }
-
- private:
-  friend class base::RefCounted<TokenCore>;
-
-  ~TokenCore() {}
-
-  const char* const token_;
-  int copy_count_;
-};
-
-enum SwapBehavior {
-  USE_DEFAULT_SWAP,
-  USE_FAST_SWAP_VIA_ADL,
-  USE_FAST_SWAP_VIA_SPECIALIZATION
-};
-
-const char kEmptyToken[] = "<empty token>";
-
-// Base class for various token classes, differing in swap behavior.
-template <SwapBehavior>
-class TokenBase {
- public:
-  TokenBase() : core_(new TokenCore(kEmptyToken)) {}
-
-  explicit TokenBase(const char* token) : core_(new TokenCore(token)) {}
-
-  TokenBase(const TokenBase& other) : core_(other.core_) {
-    core_->RecordCopy();
-  }
-
-  TokenBase& operator=(const TokenBase& other) {
-    core_ = other.core_;
-    core_->RecordCopy();
-    return *this;
-  }
-
-  const char* GetToken() const {
-    return core_->GetToken();
-  }
-
-  int GetCopyCount() const {
-    return core_->GetCopyCount();
-  }
-
-  // For associative containers.
-  bool operator<(const TokenBase& other) const {
-    return std::string(GetToken()) < std::string(other.GetToken());
-  }
-
-  // STL-style swap.
-  void swap(TokenBase& other) {
-    using std::swap;
-    swap(other.core_, core_);
-  }
-
-  // Google-style swap.
-  void Swap(TokenBase* other) {
-    using std::swap;
-    swap(other->core_, core_);
-  }
-
- private:
-  scoped_refptr<TokenCore> core_;
-};
-
-typedef TokenBase<USE_DEFAULT_SWAP> Token;
-typedef TokenBase<USE_FAST_SWAP_VIA_ADL> ADLToken;
-typedef TokenBase<USE_FAST_SWAP_VIA_SPECIALIZATION> SpecializationToken;
-
-void swap(ADLToken& t1, ADLToken& t2) {
-  t1.Swap(&t2);
-}
-
-}  // namespace syncer
-
-// Allowed by the standard (17.4.3.1/1).
-namespace std {
-
-template <>
-void swap(syncer::SpecializationToken& t1,
-          syncer::SpecializationToken& t2) {
-  t1.Swap(&t2);
-}
-
-}  // namespace std
-
-namespace syncer {
-namespace {
-
-class ImmutableTest : public ::testing::Test {};
-
-TEST_F(ImmutableTest, Int) {
-  int x = 5;
-  Immutable<int> ix(&x);
-  EXPECT_EQ(5, ix.Get());
-  EXPECT_EQ(0, x);
-}
-
-TEST_F(ImmutableTest, IntCopy) {
-  int x = 5;
-  Immutable<int> ix = Immutable<int>(&x);
-  EXPECT_EQ(5, ix.Get());
-  EXPECT_EQ(0, x);
-}
-
-TEST_F(ImmutableTest, IntAssign) {
-  int x = 5;
-  Immutable<int> ix;
-  EXPECT_EQ(0, ix.Get());
-  ix = Immutable<int>(&x);
-  EXPECT_EQ(5, ix.Get());
-  EXPECT_EQ(0, x);
-}
-
-TEST_F(ImmutableTest, IntMakeImmutable) {
-  int x = 5;
-  Immutable<int> ix = MakeImmutable(&x);
-  EXPECT_EQ(5, ix.Get());
-  EXPECT_EQ(0, x);
-}
-
-template <typename T, typename ImmutableT>
-void RunTokenTest(const char* token, bool expect_copies) {
-  SCOPED_TRACE(token);
-  T t(token);
-  EXPECT_EQ(token, t.GetToken());
-  EXPECT_EQ(0, t.GetCopyCount());
-
-  ImmutableT immutable_t(&t);
-  EXPECT_EQ(token, immutable_t.Get().GetToken());
-  EXPECT_EQ(kEmptyToken, t.GetToken());
-  EXPECT_EQ(expect_copies, immutable_t.Get().GetCopyCount() > 0);
-  EXPECT_EQ(expect_copies, t.GetCopyCount() > 0);
-}
-
-TEST_F(ImmutableTest, Token) {
-  RunTokenTest<Token, Immutable<Token> >("Token", true /* expect_copies */);
-}
-
-TEST_F(ImmutableTest, TokenSwapMemFnByRef) {
-  RunTokenTest<Token, Immutable<Token, HasSwapMemFnByRef<Token> > >(
-      "TokenSwapMemFnByRef", false /* expect_copies */);
-}
-
-TEST_F(ImmutableTest, TokenSwapMemFnByPtr) {
-  RunTokenTest<Token, Immutable<Token, HasSwapMemFnByPtr<Token> > >(
-      "TokenSwapMemFnByPtr", false /* expect_copies */);
-}
-
-TEST_F(ImmutableTest, ADLToken) {
-  RunTokenTest<ADLToken, Immutable<ADLToken> >(
-      "ADLToken", false /* expect_copies */);
-}
-
-TEST_F(ImmutableTest, SpecializationToken) {
-  RunTokenTest<SpecializationToken, Immutable<SpecializationToken> >(
-      "SpecializationToken", false /* expect_copies */);
-}
-
-template <typename C, typename ImmutableC>
-void RunTokenContainerTest(const char* token) {
-  SCOPED_TRACE(token);
-  const Token tokens[] = { Token(), Token(token) };
-  const size_t token_count = arraysize(tokens);
-  C c(tokens, tokens + token_count);
-  const int copy_count = c.begin()->GetCopyCount();
-  EXPECT_GT(copy_count, 0);
-  for (typename C::const_iterator it = c.begin(); it != c.end(); ++it) {
-    EXPECT_EQ(copy_count, it->GetCopyCount());
-  }
-
-  // Make sure that making the container immutable doesn't incur any
-  // copies of the tokens.
-  ImmutableC immutable_c(&c);
-  EXPECT_TRUE(c.empty());
-  ASSERT_EQ(token_count, immutable_c.Get().size());
-  int i = 0;
-  for (typename C::const_iterator it = c.begin(); it != c.end(); ++it) {
-    EXPECT_EQ(tokens[i].GetToken(), it->GetToken());
-    EXPECT_EQ(copy_count, it->GetCopyCount());
-    ++i;
-  }
-}
-
-TEST_F(ImmutableTest, Vector) {
-  RunTokenContainerTest<std::vector<Token>, Immutable<std::vector<Token> > >(
-      "Vector");
-}
-
-TEST_F(ImmutableTest, VectorSwapMemFnByRef) {
-  RunTokenContainerTest<
-    std::vector<Token>,
-    Immutable<std::vector<Token>, HasSwapMemFnByRef<std::vector<Token> > > >(
-        "VectorSwapMemFnByRef");
-}
-
-TEST_F(ImmutableTest, Deque) {
-  RunTokenContainerTest<std::deque<Token>, Immutable<std::deque<Token> > >(
-      "Deque");
-}
-
-TEST_F(ImmutableTest, List) {
-  RunTokenContainerTest<std::list<Token>, Immutable<std::list<Token> > >(
-      "List");
-}
-
-TEST_F(ImmutableTest, Set) {
-  RunTokenContainerTest<std::set<Token>, Immutable<std::set<Token> > >(
-      "Set");
-}
-
-}  // namespace
-}  // namespace syncer