1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "base/tuple.h" 6 7 #include "base/compiler_specific.h" 8 #include "testing/gtest/include/gtest/gtest.h" 9 10 namespace base { 11 12 namespace { 13 14 void DoAdd(int a, int b, int c, int* res) { 15 *res = a + b + c; 16 } 17 18 struct Addy { 19 Addy() = default; 20 void DoAdd(int a, int b, int c, int d, int* res) { 21 *res = a + b + c + d; 22 } 23 }; 24 25 struct Addz { 26 Addz() = default; 27 void DoAdd(int a, int b, int c, int d, int e, int* res) { 28 *res = a + b + c + d + e; 29 } 30 }; 31 32 } // namespace 33 34 TEST(TupleTest, Basic) { 35 std::tuple<> t0 = std::make_tuple(); 36 ALLOW_UNUSED_LOCAL(t0); 37 std::tuple<int> t1(1); 38 std::tuple<int, const char*> t2 = 39 std::make_tuple(1, static_cast<const char*>("wee")); 40 ALLOW_UNUSED_LOCAL(t2); 41 std::tuple<int, int, int> t3(1, 2, 3); 42 ALLOW_UNUSED_LOCAL(t3); 43 std::tuple<int, int, int, int*> t4(1, 2, 3, &std::get<0>(t1)); 44 std::tuple<int, int, int, int, int*> t5(1, 2, 3, 4, &std::get<0>(t4)); 45 std::tuple<int, int, int, int, int, int*> t6(1, 2, 3, 4, 5, &std::get<0>(t4)); 46 47 EXPECT_EQ(1, std::get<0>(t1)); 48 DispatchToFunction(&DoAdd, t4); 49 EXPECT_EQ(6, std::get<0>(t1)); 50 51 int res = 0; 52 DispatchToFunction(&DoAdd, std::make_tuple(9, 8, 7, &res)); 53 EXPECT_EQ(24, res); 54 55 Addy addy; 56 EXPECT_EQ(1, std::get<0>(t4)); 57 DispatchToMethod(&addy, &Addy::DoAdd, t5); 58 EXPECT_EQ(10, std::get<0>(t4)); 59 60 Addz addz; 61 EXPECT_EQ(10, std::get<0>(t4)); 62 DispatchToMethod(&addz, &Addz::DoAdd, t6); 63 EXPECT_EQ(15, std::get<0>(t4)); 64 } 65 66 namespace { 67 68 struct CopyLogger { 69 CopyLogger() { ++TimesConstructed; } 70 CopyLogger(const CopyLogger& tocopy) { ++TimesConstructed; ++TimesCopied; } 71 ~CopyLogger() = default; 72 73 static int TimesCopied; 74 static int TimesConstructed; 75 }; 76 77 void SomeLoggerMethRef(const CopyLogger& logy, const CopyLogger* ptr, bool* b) { 78 *b = &logy == ptr; 79 } 80 81 void SomeLoggerMethCopy(CopyLogger logy, const CopyLogger* ptr, bool* b) { 82 *b = &logy == ptr; 83 } 84 85 int CopyLogger::TimesCopied = 0; 86 int CopyLogger::TimesConstructed = 0; 87 88 } // namespace 89 90 TEST(TupleTest, Copying) { 91 CopyLogger logger; 92 EXPECT_EQ(0, CopyLogger::TimesCopied); 93 EXPECT_EQ(1, CopyLogger::TimesConstructed); 94 95 bool res = false; 96 97 // Creating the tuple should copy the class to store internally in the tuple. 98 std::tuple<CopyLogger, CopyLogger*, bool*> tuple(logger, &logger, &res); 99 std::get<CopyLogger*>(tuple) = &std::get<CopyLogger>(tuple); 100 EXPECT_EQ(2, CopyLogger::TimesConstructed); 101 EXPECT_EQ(1, CopyLogger::TimesCopied); 102 103 // Our internal Logger and the one passed to the function should be the same. 104 res = false; 105 DispatchToFunction(&SomeLoggerMethRef, tuple); 106 EXPECT_TRUE(res); 107 EXPECT_EQ(2, CopyLogger::TimesConstructed); 108 EXPECT_EQ(1, CopyLogger::TimesCopied); 109 110 // Now they should be different, since the function call will make a copy. 111 res = false; 112 DispatchToFunction(&SomeLoggerMethCopy, tuple); 113 EXPECT_FALSE(res); 114 EXPECT_EQ(3, CopyLogger::TimesConstructed); 115 EXPECT_EQ(2, CopyLogger::TimesCopied); 116 } 117 118 } // namespace base 119
