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1 /* | |
2 * Copyright (c) 2015 The WebRTC project authors. All Rights Reserved. | |
3 * | |
4 * Use of this source code is governed by a BSD-style license | |
5 * that can be found in the LICENSE file in the root of the source | |
6 * tree. An additional intellectual property rights grant can be found | |
7 * in the file PATENTS. All contributing project authors may | |
8 * be found in the AUTHORS file in the root of the source tree. | |
9 */ | |
10 | |
11 #ifndef WEBRTC_TEST_RANDOM_H_ | |
12 #define WEBRTC_TEST_RANDOM_H_ | |
13 | |
14 #include <limits> | |
15 | |
16 #include "webrtc/typedefs.h" | |
17 #include "webrtc/base/constructormagic.h" | |
18 | |
19 namespace webrtc { | |
20 | |
21 namespace test { | |
22 | |
23 class Random { | |
24 public: | |
25 explicit Random(uint32_t seed); | |
26 | |
27 // Return pseudo-random integer of the specified type. | |
28 template <typename T> | |
29 T Rand() { | |
30 static_assert(std::numeric_limits<T>::is_integer && | |
31 std::numeric_limits<T>::radix == 2 && | |
32 std::numeric_limits<T>::digits <= 32, | |
33 "Rand is only supported for built-in integer types that are " | |
34 "32 bits or smaller."); | |
35 return static_cast<T>(Rand(std::numeric_limits<uint32_t>::max())); | |
36 } | |
37 | |
38 // Uniformly distributed pseudo-random number in the interval [0, t]. | |
39 uint32_t Rand(uint32_t t); | |
40 | |
41 // Uniformly distributed pseudo-random number in the interval [low, high]. | |
42 uint32_t Rand(uint32_t low, uint32_t high); | |
43 | |
44 // Normal Distribution. | |
45 int Gaussian(int mean, int standard_deviation); | |
46 | |
47 // Exponential Distribution. | |
48 int Exponential(float lambda); | |
49 | |
50 // TODO(solenberg): Random from histogram. | |
51 // template<typename T> int Distribution(const std::vector<T> histogram) { | |
52 | |
53 private: | |
54 uint32_t a_; | |
55 uint32_t b_; | |
56 | |
57 RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(Random); | |
58 }; | |
59 | |
60 // Return pseudo-random number in the interval [0.0, 1.0). | |
61 template <> | |
62 float Random::Rand<float>(); | |
63 | |
64 // Return pseudo-random boolean value. | |
65 template <> | |
66 bool Random::Rand<bool>(); | |
67 | |
68 } // namespace test | |
69 } // namespace webrtc | |
70 | |
71 #endif // WEBRTC_TEST_RANDOM_H_ | |
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