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39
40#ifndef QCALENDARMATH_P_H
41#define QCALENDARMATH_P_H
42
43//
44// W A R N I N G
45// -------------
46//
47// This file is not part of the Qt API. It exists for the convenience
48// of q*calendar.cpp. This header file may change from version to version
49// without notice, or even be removed.
50//
51// We mean it.
52//
53
54#include <QtCore/private/qglobal_p.h>
55
56QT_BEGIN_NAMESPACE
57
58namespace QRoundingDown {
59/*
60 Division, rounding down (rather than towards zero).
61
62 From C++11 onwards, integer division is defined to round towards zero, so we
63 can rely on that when implementing this. This is only used with denominator b
64 > 0, so we only have to treat negative numerator, a, specially.
65*/
66
67template<typename Int> constexpr Int qDiv(Int a, unsigned b)
68{ return (a - (a < 0 ? int(b - 1) : 0)) / int(b); }
69
70template<typename Int> constexpr Int qMod(Int a, unsigned b)
71{ return a - qDiv(a, b) * b; }
72
73} // QRoundingDown
74
75QT_END_NAMESPACE
76
77#endif // QCALENDARMATH_P_H
78

source code of qtbase/src/corelib/time/qcalendarmath_p.h