1 // Copyright 2017 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/random/internal/randen.h"
16
17 #include <cstring>
18
19 #include "gtest/gtest.h"
20 #include "absl/meta/type_traits.h"
21
22 namespace {
23
24 using absl::random_internal::Randen;
25
26 // Local state parameters.
27 constexpr size_t kStateSizeT = Randen::kStateBytes / sizeof(uint64_t);
28
TEST(RandenTest,CopyAndMove)29 TEST(RandenTest, CopyAndMove) {
30 static_assert(std::is_copy_constructible<Randen>::value,
31 "Randen must be copy constructible");
32
33 static_assert(absl::is_copy_assignable<Randen>::value,
34 "Randen must be copy assignable");
35
36 static_assert(std::is_move_constructible<Randen>::value,
37 "Randen must be move constructible");
38
39 static_assert(absl::is_move_assignable<Randen>::value,
40 "Randen must be move assignable");
41 }
42
TEST(RandenTest,Default)43 TEST(RandenTest, Default) {
44 constexpr uint64_t kGolden[] = {
45 0x6c6534090ee6d3ee, 0x044e2b9b9d5333c6, 0xc3c14f134e433977,
46 0xdda9f47cd90410ee, 0x887bf3087fd8ca10, 0xf0b780f545c72912,
47 0x15dbb1d37696599f, 0x30ec63baff3c6d59, 0xb29f73606f7f20a6,
48 0x02808a316f49a54c, 0x3b8feaf9d5c8e50e, 0x9cbf605e3fd9de8a,
49 0xc970ae1a78183bbb, 0xd8b2ffd356301ed5, 0xf4b327fe0fc73c37,
50 0xcdfd8d76eb8f9a19, 0xc3a506eb91420c9d, 0xd5af05dd3eff9556,
51 0x48db1bb78f83c4a1, 0x7023920e0d6bfe8c, 0x58d3575834956d42,
52 0xed1ef4c26b87b840, 0x8eef32a23e0b2df3, 0x497cabf3431154fc,
53 0x4e24370570029a8b, 0xd88b5749f090e5ea, 0xc651a582a970692f,
54 0x78fcec2cbb6342f5, 0x463cb745612f55db, 0x352ee4ad1816afe3,
55 0x026ff374c101da7e, 0x811ef0821c3de851,
56 };
57
58 alignas(16) uint64_t state[kStateSizeT];
59 std::memset(state, 0, sizeof(state));
60
61 Randen r;
62 r.Generate(state);
63
64 auto id = std::begin(state);
65 for (const auto& elem : kGolden) {
66 EXPECT_EQ(elem, *id++);
67 }
68 }
69
70 } // namespace
71