1 /*
2 * Copyright (c) Facebook, Inc. and its affiliates.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <folly/container/Access.h>
18
19 #include <array>
20 #include <initializer_list>
21 #include <vector>
22
23 #include <folly/portability/GTest.h>
24
25 class AccessTest : public testing::Test {};
26
TEST_F(AccessTest,size_vector)27 TEST_F(AccessTest, size_vector) {
28 EXPECT_EQ(3, folly::access::size(std::vector<int>{1, 2, 3}));
29 }
30
TEST_F(AccessTest,size_array)31 TEST_F(AccessTest, size_array) {
32 constexpr auto const a = std::array<int, 3>{{1, 2, 3}};
33 constexpr auto const size = folly::access::size(a);
34 EXPECT_EQ(3, size);
35 }
36
TEST_F(AccessTest,size_carray)37 TEST_F(AccessTest, size_carray) {
38 constexpr int const a[3] = {1, 2, 3};
39 constexpr auto const size = folly::access::size(a);
40 EXPECT_EQ(3, size);
41 }
42
TEST_F(AccessTest,size_initializer_list)43 TEST_F(AccessTest, size_initializer_list) {
44 EXPECT_EQ(3, folly::access::size({1, 2, 3}));
45 EXPECT_EQ(3, folly::access::size(std::initializer_list<int>{1, 2, 3}));
46 }
47
TEST_F(AccessTest,empty_vector)48 TEST_F(AccessTest, empty_vector) {
49 EXPECT_FALSE(folly::access::empty(std::vector<int>{1, 2, 3}));
50 EXPECT_TRUE(folly::access::empty(std::vector<int>{}));
51 }
52
TEST_F(AccessTest,empty_array)53 TEST_F(AccessTest, empty_array) {
54 {
55 constexpr auto const a = std::array<int, 3>{{1, 2, 3}};
56 constexpr auto const empty = folly::access::empty(a);
57 EXPECT_FALSE(empty);
58 }
59 {
60 constexpr auto const a = std::array<int, 0>{{}};
61 constexpr auto const empty = folly::access::empty(a);
62 EXPECT_TRUE(empty);
63 }
64 }
65
TEST_F(AccessTest,empty_carray)66 TEST_F(AccessTest, empty_carray) {
67 constexpr int const a[3] = {1, 2, 3};
68 constexpr auto const empty = folly::access::empty(a);
69 EXPECT_FALSE(empty);
70 // zero-length arrays are not allowed in the language
71 }
72
TEST_F(AccessTest,empty_initializer_list)73 TEST_F(AccessTest, empty_initializer_list) {
74 EXPECT_FALSE(folly::access::empty({1, 2, 3}));
75 EXPECT_FALSE(folly::access::empty(std::initializer_list<int>{1, 2, 3}));
76 EXPECT_TRUE(folly::access::empty(std::initializer_list<int>{}));
77 }
78
TEST_F(AccessTest,data_vector)79 TEST_F(AccessTest, data_vector) {
80 EXPECT_EQ(1, *folly::access::data(std::vector<int>{1, 2, 3}));
81 auto v = std::vector<int>{1, 2, 3};
82 *folly::access::data(v) = 4;
83 EXPECT_EQ(4, v[0]);
84 }
85
TEST_F(AccessTest,data_array)86 TEST_F(AccessTest, data_array) {
87 constexpr auto const a = std::array<int, 3>{{1, 2, 3}};
88 auto const data = folly::access::data(a); // not constexpr until C++17
89 EXPECT_EQ(1, *data);
90 }
91
TEST_F(AccessTest,data_carray)92 TEST_F(AccessTest, data_carray) {
93 constexpr int const a[3] = {1, 2, 3};
94 auto const data = folly::access::data(a); // not constexpr until C++17
95 EXPECT_EQ(1, *data);
96 }
97
TEST_F(AccessTest,data_initializer_list)98 TEST_F(AccessTest, data_initializer_list) {
99 EXPECT_EQ(1, *folly::access::data({1, 2, 3}));
100 EXPECT_EQ(1, *folly::access::data(std::initializer_list<int>{1, 2, 3}));
101 }
102
TEST_F(AccessTest,begin_vector)103 TEST_F(AccessTest, begin_vector) {
104 auto v = std::vector<int>{1, 2, 3};
105 EXPECT_EQ(v.begin(), folly::access::begin(v));
106 }
107
TEST_F(AccessTest,begin_array)108 TEST_F(AccessTest, begin_array) {
109 constexpr auto const a = std::array<int, 3>{{1, 2, 3}};
110 EXPECT_EQ(a.begin(), folly::access::begin(a));
111 }
112
TEST_F(AccessTest,begin_carray)113 TEST_F(AccessTest, begin_carray) {
114 constexpr int const a[3] = {1, 2, 3};
115 EXPECT_EQ(a + 0, folly::access::begin(a));
116 }
117
TEST_F(AccessTest,begin_initializer_list)118 TEST_F(AccessTest, begin_initializer_list) {
119 auto i = std::initializer_list<int>{1, 2, 3};
120 EXPECT_EQ(i.begin(), folly::access::begin(i));
121 }
122
TEST_F(AccessTest,end_vector)123 TEST_F(AccessTest, end_vector) {
124 auto v = std::vector<int>{1, 2, 3};
125 EXPECT_EQ(v.end(), folly::access::end(v));
126 }
127
TEST_F(AccessTest,end_array)128 TEST_F(AccessTest, end_array) {
129 constexpr auto const a = std::array<int, 3>{{1, 2, 3}};
130 EXPECT_EQ(a.end(), folly::access::end(a));
131 }
132
TEST_F(AccessTest,end_carray)133 TEST_F(AccessTest, end_carray) {
134 constexpr int const a[3] = {1, 2, 3};
135 EXPECT_EQ(a + 3, folly::access::end(a));
136 }
137
TEST_F(AccessTest,end_initializer_list)138 TEST_F(AccessTest, end_initializer_list) {
139 auto i = std::initializer_list<int>{1, 2, 3};
140 EXPECT_EQ(i.end(), folly::access::end(i));
141 }
142