1 /*
2 * Copyright 2019 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 RTC_BASE_NUMERICS_DIVIDE_ROUND_H_
12 #define RTC_BASE_NUMERICS_DIVIDE_ROUND_H_
13
14 #include <type_traits>
15
16 #include "rtc_base/checks.h"
17 #include "rtc_base/numerics/safe_compare.h"
18
19 namespace webrtc {
20
21 template <typename Dividend, typename Divisor>
DivideRoundUp(Dividend dividend,Divisor divisor)22 inline auto constexpr DivideRoundUp(Dividend dividend, Divisor divisor) {
23 static_assert(std::is_integral<Dividend>(), "");
24 static_assert(std::is_integral<Divisor>(), "");
25 RTC_DCHECK_GE(dividend, 0);
26 RTC_DCHECK_GT(divisor, 0);
27
28 auto quotient = dividend / divisor;
29 auto remainder = dividend % divisor;
30 return quotient + (remainder > 0 ? 1 : 0);
31 }
32
33 template <typename Dividend, typename Divisor>
DivideRoundToNearest(Dividend dividend,Divisor divisor)34 inline auto constexpr DivideRoundToNearest(Dividend dividend, Divisor divisor) {
35 static_assert(std::is_integral<Dividend>(), "");
36 static_assert(std::is_integral<Divisor>(), "");
37 RTC_DCHECK_GE(dividend, 0);
38 RTC_DCHECK_GT(divisor, 0);
39
40 auto half_of_divisor = (divisor - 1) / 2;
41 auto quotient = dividend / divisor;
42 auto remainder = dividend % divisor;
43 return quotient + (rtc::SafeGt(remainder, half_of_divisor) ? 1 : 0);
44 }
45
46 } // namespace webrtc
47
48 #endif // RTC_BASE_NUMERICS_DIVIDE_ROUND_H_
49