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The Tor Browser
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common_policy_traits_test.cc (4781B)

      1 // Copyright 2022 The Abseil Authors.
      2 //
      3 // Licensed under the Apache License, Version 2.0 (the "License");
      4 // you may not use this file except in compliance with the License.
      5 // You may obtain a copy of the License at
      6 //
      7 //      https://www.apache.org/licenses/LICENSE-2.0
      8 //
      9 // Unless required by applicable law or agreed to in writing, software
     10 // distributed under the License is distributed on an "AS IS" BASIS,
     11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     12 // See the License for the specific language governing permissions and
     13 // limitations under the License.
     14 
     15 #include "absl/container/internal/common_policy_traits.h"
     16 
     17 #include <functional>
     18 #include <memory>
     19 #include <type_traits>
     20 #include <utility>
     21 
     22 #include "gmock/gmock.h"
     23 #include "gtest/gtest.h"
     24 #include "absl/base/config.h"
     25 
     26 namespace absl {
     27 ABSL_NAMESPACE_BEGIN
     28 namespace container_internal {
     29 namespace {
     30 
     31 using ::testing::MockFunction;
     32 using ::testing::AnyNumber;
     33 using ::testing::ReturnRef;
     34 
     35 using Slot = int;
     36 
     37 struct PolicyWithoutOptionalOps {
     38  using slot_type = Slot;
     39  using key_type = Slot;
     40  using init_type = Slot;
     41 
     42  struct PolicyFunctions {
     43    std::function<void(void*, Slot*, Slot)> construct;
     44    std::function<void(void*, Slot*)> destroy;
     45    std::function<Slot&(Slot*)> element;
     46  };
     47 
     48  static PolicyFunctions* functions() {
     49    static PolicyFunctions* functions = new PolicyFunctions();
     50    return functions;
     51  }
     52 
     53  static void construct(void* a, Slot* b, Slot c) {
     54    functions()->construct(a, b, c);
     55  }
     56  static void destroy(void* a, Slot* b) { functions()->destroy(a, b); }
     57  static Slot& element(Slot* b) { return functions()->element(b); }
     58 };
     59 
     60 struct PolicyWithOptionalOps : PolicyWithoutOptionalOps {
     61  struct TransferFunctions {
     62    std::function<void(void*, Slot*, Slot*)> transfer;
     63  };
     64 
     65  static TransferFunctions* transfer_fn() {
     66    static TransferFunctions* transfer_fn = new TransferFunctions();
     67    return transfer_fn;
     68  }
     69  static void transfer(void* a, Slot* b, Slot* c) {
     70    transfer_fn()->transfer(a, b, c);
     71  }
     72 };
     73 
     74 struct PolicyWithMemcpyTransferAndTrivialDestroy : PolicyWithoutOptionalOps {
     75  static std::true_type transfer(void*, Slot*, Slot*) { return {}; }
     76  static std::true_type destroy(void*, Slot*) { return {}; }
     77 };
     78 
     79 struct Test : ::testing::Test {
     80  Test() {
     81    PolicyWithoutOptionalOps::functions()->construct = [&](void* a1, Slot* a2,
     82                                                           Slot a3) {
     83      construct.Call(a1, a2, std::move(a3));
     84    };
     85    PolicyWithoutOptionalOps::functions()->destroy = [&](void* a1, Slot* a2) {
     86      destroy.Call(a1, a2);
     87    };
     88 
     89    PolicyWithoutOptionalOps::functions()->element = [&](Slot* a1) -> Slot& {
     90      return element.Call(a1);
     91    };
     92 
     93    PolicyWithOptionalOps::transfer_fn()->transfer =
     94        [&](void* a1, Slot* a2, Slot* a3) { return transfer.Call(a1, a2, a3); };
     95  }
     96 
     97  std::allocator<Slot> alloc;
     98  int a = 53;
     99 
    100  MockFunction<void(void*, Slot*, Slot)> construct;
    101  MockFunction<void(void*, Slot*)> destroy;
    102 
    103  MockFunction<Slot&(Slot*)> element;
    104 
    105  MockFunction<void(void*, Slot*, Slot*)> transfer;
    106 };
    107 
    108 TEST_F(Test, construct) {
    109  EXPECT_CALL(construct, Call(&alloc, &a, 53));
    110  common_policy_traits<PolicyWithoutOptionalOps>::construct(&alloc, &a, 53);
    111 }
    112 
    113 TEST_F(Test, destroy) {
    114  EXPECT_CALL(destroy, Call(&alloc, &a));
    115  common_policy_traits<PolicyWithoutOptionalOps>::destroy(&alloc, &a);
    116 }
    117 
    118 TEST_F(Test, element) {
    119  int b = 0;
    120  EXPECT_CALL(element, Call(&a)).WillOnce(ReturnRef(b));
    121  EXPECT_EQ(&b, &common_policy_traits<PolicyWithoutOptionalOps>::element(&a));
    122 }
    123 
    124 TEST_F(Test, without_transfer) {
    125  int b = 42;
    126  EXPECT_CALL(element, Call(&a)).Times(AnyNumber()).WillOnce(ReturnRef(a));
    127  EXPECT_CALL(element, Call(&b)).WillOnce(ReturnRef(b));
    128  EXPECT_CALL(construct, Call(&alloc, &a, b)).Times(AnyNumber());
    129  EXPECT_CALL(destroy, Call(&alloc, &b)).Times(AnyNumber());
    130  common_policy_traits<PolicyWithoutOptionalOps>::transfer(&alloc, &a, &b);
    131 }
    132 
    133 TEST_F(Test, with_transfer) {
    134  int b = 42;
    135  EXPECT_CALL(transfer, Call(&alloc, &a, &b));
    136  common_policy_traits<PolicyWithOptionalOps>::transfer(&alloc, &a, &b);
    137 }
    138 
    139 TEST(TransferUsesMemcpy, Basic) {
    140  EXPECT_FALSE(
    141      common_policy_traits<PolicyWithOptionalOps>::transfer_uses_memcpy());
    142  EXPECT_TRUE(
    143      common_policy_traits<
    144          PolicyWithMemcpyTransferAndTrivialDestroy>::transfer_uses_memcpy());
    145 }
    146 
    147 TEST(DestroyIsTrivial, Basic) {
    148  EXPECT_FALSE(common_policy_traits<PolicyWithOptionalOps>::destroy_is_trivial<
    149               std::allocator<char>>());
    150  EXPECT_TRUE(common_policy_traits<PolicyWithMemcpyTransferAndTrivialDestroy>::
    151                  destroy_is_trivial<std::allocator<char>>());
    152 }
    153 
    154 }  // namespace
    155 }  // namespace container_internal
    156 ABSL_NAMESPACE_END
    157 }  // namespace absl