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Side by Side Diff: webrtc/base/mathutils.h

Issue 2877023002: Move webrtc/{base => rtc_base} (Closed)
Patch Set: update presubmit.py and DEPS include rules Created 3 years, 5 months ago
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1 /* 1 /*
2 * Copyright 2005 The WebRTC Project Authors. All rights reserved. 2 * Copyright 2005 The WebRTC Project Authors. All rights reserved.
3 * 3 *
4 * Use of this source code is governed by a BSD-style license 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 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 6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may 7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree. 8 * be found in the AUTHORS file in the root of the source tree.
9 */ 9 */
10 10
11 #ifndef WEBRTC_BASE_MATHUTILS_H_ 11 #ifndef WEBRTC_BASE_MATHUTILS_H_
12 #define WEBRTC_BASE_MATHUTILS_H_ 12 #define WEBRTC_BASE_MATHUTILS_H_
13 13
14 #include <math.h>
15 #include <type_traits>
16 14
17 #include "webrtc/base/checks.h" 15 // This header is deprecated and is just left here temporarily during
18 16 // refactoring. See https://bugs.webrtc.org/7634 for more details.
19 #ifndef M_PI 17 #include "webrtc/rtc_base/mathutils.h"
20 #define M_PI 3.14159265359f
21 #endif
22
23 // Given two numbers |x| and |y| such that x >= y, computes the difference
24 // x - y without causing undefined behavior due to signed overflow.
25 template <typename T>
26 typename std::make_unsigned<T>::type unsigned_difference(T x, T y) {
27 static_assert(
28 std::is_signed<T>::value,
29 "Function unsigned_difference is only meaningful for signed types.");
30 RTC_DCHECK_GE(x, y);
31 typedef typename std::make_unsigned<T>::type unsigned_type;
32 // int -> unsigned conversion repeatedly adds UINT_MAX + 1 until the number
33 // can be represented as an unsigned. Since we know that the actual
34 // difference x - y can be represented as an unsigned, it is sufficient to
35 // compute the difference modulo UINT_MAX + 1, i.e using unsigned arithmetic.
36 return static_cast<unsigned_type>(x) - static_cast<unsigned_type>(y);
37 }
38 18
39 #endif // WEBRTC_BASE_MATHUTILS_H_ 19 #endif // WEBRTC_BASE_MATHUTILS_H_
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