1// Copyright 2005 Google Inc.
2// All rights reserved.
3//
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17//
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29
30// ----
31// Author: lar@google.com (Laramie Leavitt)
32//
33// These tests are really compile time tests.
34// If you try to step through this in a debugger
35// you will not see any evaluations, merely that
36// value is assigned true or false sequentially.
37
38#include <google/protobuf/stubs/template_util.h>
39
40#include <google/protobuf/testing/googletest.h>
41#include <gtest/gtest.h>
42
43namespace GOOGLE_NAMESPACE = google::protobuf::internal;
44
45namespace google {
46namespace protobuf {
47namespace internal {
48namespace {
49
50TEST(TemplateUtilTest, TestSize) {
51  EXPECT_GT(sizeof(GOOGLE_NAMESPACE::big_), sizeof(GOOGLE_NAMESPACE::small_));
52}
53
54TEST(TemplateUtilTest, TestIntegralConstants) {
55  // test the built-in types.
56  EXPECT_TRUE(true_type::value);
57  EXPECT_FALSE(false_type::value);
58
59  typedef integral_constant<int, 1> one_type;
60  EXPECT_EQ(1, one_type::value);
61}
62
63TEST(TemplateUtilTest, TestTemplateIf) {
64  typedef if_<true, true_type, false_type>::type if_true;
65  EXPECT_TRUE(if_true::value);
66
67  typedef if_<false, true_type, false_type>::type if_false;
68  EXPECT_FALSE(if_false::value);
69}
70
71TEST(TemplateUtilTest, TestTemplateTypeEquals) {
72  // Check that the TemplateTypeEquals works correctly.
73  bool value = false;
74
75  // Test the same type is true.
76  value = type_equals_<int, int>::value;
77  EXPECT_TRUE(value);
78
79  // Test different types are false.
80  value = type_equals_<float, int>::value;
81  EXPECT_FALSE(value);
82
83  // Test type aliasing.
84  typedef const int foo;
85  value = type_equals_<const foo, const int>::value;
86  EXPECT_TRUE(value);
87}
88
89TEST(TemplateUtilTest, TestTemplateAndOr) {
90  // Check that the TemplateTypeEquals works correctly.
91  bool value = false;
92
93  // Yes && Yes == true.
94  value = and_<true_, true_>::value;
95  EXPECT_TRUE(value);
96  // Yes && No == false.
97  value = and_<true_, false_>::value;
98  EXPECT_FALSE(value);
99  // No && Yes == false.
100  value = and_<false_, true_>::value;
101  EXPECT_FALSE(value);
102  // No && No == false.
103  value = and_<false_, false_>::value;
104  EXPECT_FALSE(value);
105
106  // Yes || Yes == true.
107  value = or_<true_, true_>::value;
108  EXPECT_TRUE(value);
109  // Yes || No == true.
110  value = or_<true_, false_>::value;
111  EXPECT_TRUE(value);
112  // No || Yes == true.
113  value = or_<false_, true_>::value;
114  EXPECT_TRUE(value);
115  // No || No == false.
116  value = or_<false_, false_>::value;
117  EXPECT_FALSE(value);
118}
119
120TEST(TemplateUtilTest, TestIdentity) {
121  EXPECT_TRUE(
122      (type_equals_<GOOGLE_NAMESPACE::identity_<int>::type, int>::value));
123  EXPECT_TRUE(
124      (type_equals_<GOOGLE_NAMESPACE::identity_<void>::type, void>::value));
125}
126
127}  // anonymous namespace
128}  // namespace internal
129}  // namespace protobuf
130}  // namespace google
131