56b1128c8f
Removed Rand(int low, int high) since that function outputs results that are non-random and/or outside the interval if low is negative. Added new Uniform(uint32_t, uint32_t) function to replace Rand(int low, int high). Changed various unit tests to use the new functions. BUG= Review URL: https://codereview.webrtc.org/1413053002 Cr-Commit-Position: refs/heads/master@{#10541}
72 lines
1.9 KiB
C++
72 lines
1.9 KiB
C++
/*
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* Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef WEBRTC_TEST_RANDOM_H_
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#define WEBRTC_TEST_RANDOM_H_
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#include <limits>
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#include "webrtc/typedefs.h"
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#include "webrtc/base/constructormagic.h"
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namespace webrtc {
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namespace test {
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class Random {
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public:
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explicit Random(uint32_t seed);
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// Return pseudo-random integer of the specified type.
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template <typename T>
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T Rand() {
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static_assert(std::numeric_limits<T>::is_integer &&
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std::numeric_limits<T>::radix == 2 &&
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std::numeric_limits<T>::digits <= 32,
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"Rand is only supported for built-in integer types that are "
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"32 bits or smaller.");
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return static_cast<T>(Rand(std::numeric_limits<uint32_t>::max()));
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}
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// Uniformly distributed pseudo-random number in the interval [0, t].
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uint32_t Rand(uint32_t t);
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// Uniformly distributed pseudo-random number in the interval [low, high].
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uint32_t Rand(uint32_t low, uint32_t high);
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// Normal Distribution.
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int Gaussian(int mean, int standard_deviation);
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// Exponential Distribution.
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int Exponential(float lambda);
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// TODO(solenberg): Random from histogram.
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// template<typename T> int Distribution(const std::vector<T> histogram) {
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private:
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uint32_t a_;
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uint32_t b_;
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RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(Random);
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};
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// Return pseudo-random number in the interval [0.0, 1.0).
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template <>
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float Random::Rand<float>();
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// Return pseudo-random boolean value.
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template <>
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bool Random::Rand<bool>();
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} // namespace test
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} // namespace webrtc
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#endif // WEBRTC_TEST_RANDOM_H_
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