C + + Poco library Chinese Programming Reference Guide (6) Poco::timestamp

1 type Alias

Three timestamp-related type aliases, Timediff represents the difference between two timestamps, the second is a timestamp in microseconds, and the third is a timestamp in 100 nanoseconds (0.1 subtle):

typedef Int64 TIMEDIFF; Difference between two timestamps in microseconds

typedef Int64 Timeval; Monotonic UTC time value in microsecond resolution

typedef Int64 Utctimeval; Monotonic UTC time value in nanosecond resolution

2 constructors

Time stamp for current time:

Timestamp ();

Time stamp for the specified time:

Timestamp (Timeval TV);

Copy constructor:

Timestamp (const timestamp& Other);

3 Overloaded Operators

Assignment operator:

timestamp& operator = (const timestamp& other);

timestamp& operator = (timeval TV);

Comparison operators:

BOOL operator = = (CONST timestamp& TS) const;

BOOL operator!= (const timestamp& TS) const;

BOOL operator > (const timestamp& TS) const;

BOOL operator >= (const timestamp& TS) const;

BOOL operator < (const timestamp& TS) const;

BOOL operator <= (const timestamp& TS) const;

Arithmetic operators and arithmetic assignment operators

Timestamp operator + (Timediff d) const;

Timestamp operator-(Timediff d) const;

Timediff operator-(const timestamp& TS) const;

timestamp& operator + = (Timediff d);

timestamp& operator-= (Timediff D);

4 getting the timestamp of different format representations

Gets the timestamp of the std::time_t format:

std::time_t epochtime () const;

Gets the timestamp of the utc-based time format:

Utctimeval utctime () const;

Gets the timestamp of the Timeval format (microseconds):

Timeval epochmicroseconds () const;

5 other member functions

Swap time stamp:

void swap (timestamp& Timestamp);

Update Timestamp is current time:

void Update ();

The difference between the time stamp and the time stamp (TimeStamp ()-*this):

TIMEDIFF elapsed () const;

To determine whether a period of time has passed:

BOOL Iselapsed (Timediff interval) const;

6 Static member functions

Create a timestamp with the std::time_t object:

Static Timestamp Fromepochtime (std::time_t t);

Create a Timestamp with the Utctimeval object:

Static Timestamp Fromutctime (Utctimeval val);

Returns the time resolution, that is, Units per second. Because the minimum resolution of the poco::timestamp is subtle, the function returns 1000000:

Static timeval resolution ();

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