cs_DayOfWeek.h

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#pragma once
 
#include <util/cs_Math.h>
 
#include <cstdint>
 
enum class DayOfWeek : uint8_t {
    Sunday    = 1 << 0,
    Monday    = 1 << 1,
    Tuesday   = 1 << 2,
    Wednesday = 1 << 3,
    Thursday  = 1 << 4,
    Friday    = 1 << 5,
    Saturday  = 1 << 6,
};
 
typedef uint8_t DayOfWeekBitMask;
 
inline uint8_t dayNumber(DayOfWeek day) {
    for (int i = 0; i < 7; i++) {
        if (day == DayOfWeek(1 << i)) {
            return i;
        }
    }
    return 0xff;
}
 
inline DayOfWeek operator+(DayOfWeek day, int offset) {
    offset               = CsMath::mod(offset, 7);
    uint16_t shifted_day = static_cast<uint8_t>(day) << offset;
 
    if (shifted_day & 0b01111111) {
        // no overflow occured, simply return it.
        return DayOfWeek(static_cast<uint8_t>(shifted_day & 0b01111111));
    }
    else {
        // passed week boundary by shifting so shift it back by 7.
        return DayOfWeek(static_cast<uint8_t>((shifted_day >> 7) & 0b01111111));
    }
}
 
inline DayOfWeek operator-(DayOfWeek day, int offset) {
    return day + -offset;
}