1 | /* |
2 | * Copyright 2017-present Facebook, Inc. |
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 | |
27 | TEST_F(AccessTest, size_vector) { |
28 | EXPECT_EQ(3, folly::size(std::vector<int>{1, 2, 3})); |
29 | } |
30 | |
31 | TEST_F(AccessTest, size_array) { |
32 | constexpr auto const a = std::array<int, 3>{{1, 2, 3}}; |
33 | constexpr auto const size = folly::size(a); |
34 | EXPECT_EQ(3, size); |
35 | } |
36 | |
37 | TEST_F(AccessTest, size_carray) { |
38 | constexpr int const a[3] = {1, 2, 3}; |
39 | constexpr auto const size = folly::size(a); |
40 | EXPECT_EQ(3, size); |
41 | } |
42 | |
43 | TEST_F(AccessTest, size_initializer_list) { |
44 | EXPECT_EQ(3, folly::size({1, 2, 3})); |
45 | EXPECT_EQ(3, folly::size(std::initializer_list<int>{1, 2, 3})); |
46 | } |
47 | |
48 | TEST_F(AccessTest, empty_vector) { |
49 | EXPECT_FALSE(folly::empty(std::vector<int>{1, 2, 3})); |
50 | EXPECT_TRUE(folly::empty(std::vector<int>{})); |
51 | } |
52 | |
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::empty(a); |
57 | EXPECT_FALSE(empty); |
58 | } |
59 | { |
60 | constexpr auto const a = std::array<int, 0>{{}}; |
61 | constexpr auto const empty = folly::empty(a); |
62 | EXPECT_TRUE(empty); |
63 | } |
64 | } |
65 | |
66 | TEST_F(AccessTest, empty_carray) { |
67 | constexpr int const a[3] = {1, 2, 3}; |
68 | constexpr auto const empty = folly::empty(a); |
69 | EXPECT_FALSE(empty); |
70 | // zero-length arrays are not allowed in the language |
71 | } |
72 | |
73 | TEST_F(AccessTest, empty_initializer_list) { |
74 | EXPECT_FALSE(folly::empty({1, 2, 3})); |
75 | EXPECT_FALSE(folly::empty(std::initializer_list<int>{1, 2, 3})); |
76 | EXPECT_TRUE(folly::empty(std::initializer_list<int>{})); |
77 | } |
78 | |
79 | TEST_F(AccessTest, data_vector) { |
80 | EXPECT_EQ(1, *folly::data(std::vector<int>{1, 2, 3})); |
81 | auto v = std::vector<int>{1, 2, 3}; |
82 | *folly::data(v) = 4; |
83 | EXPECT_EQ(4, v[0]); |
84 | } |
85 | |
86 | TEST_F(AccessTest, data_array) { |
87 | constexpr auto const a = std::array<int, 3>{{1, 2, 3}}; |
88 | auto const data = folly::data(a); // not constexpr until C++17 |
89 | EXPECT_EQ(1, *data); |
90 | } |
91 | |
92 | TEST_F(AccessTest, data_carray) { |
93 | constexpr int const a[3] = {1, 2, 3}; |
94 | auto const data = folly::data(a); // not constexpr until C++17 |
95 | EXPECT_EQ(1, *data); |
96 | } |
97 | |
98 | TEST_F(AccessTest, data_initializer_list) { |
99 | EXPECT_EQ(1, *folly::data({1, 2, 3})); |
100 | EXPECT_EQ(1, *folly::data(std::initializer_list<int>{1, 2, 3})); |
101 | } |
102 | |