5251bf3a
 Steven de Ridder
Initial commit. d...
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
|
#ifndef OSDEV_COMPONENTS_TIMESTAMP_H
#define OSDEV_COMPONENTS_TIMESTAMP_H
#include <limits>
#include <stdexcept>
#include <QString>
namespace osdev {
namespace components {
/**
* @brief Timestamp class that allows formation of a sequence of ordered events.
*/
class Timestamp
{
public:
/**
* @brief Creates an invalid timestamp. This is the oldest possible timestamp.
* @note A timestamp can only become valid by assigning a valid timestamp to it.
*/
Timestamp();
/**
* @brief Creates a timestamp based on miliseconds since the epoch.
* @param msecsSinceEpoch Number of miliseconds since the epoch. Value 0 leads to valid timestamp.
* @note Timestamp with value 0 is larger then the invalid timestamp.
*/
explicit Timestamp(unsigned long long msecsSinceEpoch);
// default constructable and movable.
Timestamp(const Timestamp&) = default;
Timestamp& operator=(const Timestamp&) = default;
Timestamp(Timestamp&&) = default;
Timestamp& operator=(Timestamp&&) = default;
/**
* @return true if this timestamp is valid, false otherwise.
*/
bool valid() const
{
return (m_seqNr > 0);
}
/**
* @return true if this timestamp is smaller (older) then rhs.
*/
bool operator<(const Timestamp& rhs) const;
/**
* @brief Prefix addition operator.
* Increases the Timestamp sequencenumber so that timestamps with the same number of msecs since the epoch can also be ordered.
* @note An invalid timestamp remains invalid.
* @return Reference to this timestamp.
* @throw std::out_of_range exception when seqnr is about to overflow.
*/
Timestamp& operator++();
/**
* @brief Postfix addition operator.
* Increases the Timestamp sequencenumber so that timestamps with the same number of msecs since the epoch can also be ordered.
* @note An invalid timestamp remains invalid.
* @return The timestamp as it was before increment.
* @throw std::out_of_range exception when seqnr is about to overflow.
*/
Timestamp operator++(int);
/**
* @return Stringified timestamp as msecsSinceEpoch:seqNr.
*/
QString toString() const;
private:
unsigned long long m_msecsSinceEpoch; ///< Number of miliseconds since the epoch.
unsigned long long m_seqNr; ///< Sequence number.
};
} /* End namespace components */
} /* End namespace osdev */
#endif /* OSDEV_COMPONENTS_TIMESTAMP_H */
|
