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Struct `core.time.Duration`

Represents a duration of time of weeks or less (kept internally as hnsecs). (e.g. 22 days or 700 seconds).


						
				struct Duration
				;

It is used when representing a duration of time - such as how long to sleep with core.thread.Thread.sleep.

In std.datetime, it is also used as the result of various arithmetic operations on time points.

Use the dur function or one of its non-generic aliases to create Durations.

It's not possible to create a Duration of months or years, because the variable number of days in a month or year makes it impossible to convert between months or years and smaller units without a specific date. So, nothing uses Durations when dealing with months or years. Rather, functions specific to months and years are defined. For instance, std.datetime.Date has add!"years" and add!"months" for adding years and months rather than creating a Duration of years or months and adding that to a std.datetime.Date. But Duration is used when dealing with weeks or smaller.

Properties

Name	Type	Description
`isNegative`[get]	`bool`	Returns whether this `Duration` is negative.
`max`[get]	`Duration`	Largest `Duration` possible.
`min`[get]	`Duration`	Most negative `Duration` possible.
`total`[get]	`long`	Returns the total number of the given units in this `Duration`. So, unlike `split`, it does not strip out the larger units.
`zero`[get]	`Duration`	A `Duration` of `0`. It's shorter than doing something like `dur!"seconds"(0)` and more explicit than `Duration.init`.

Methods

Name	Description
`opBinary`	Adds, subtracts or calculates the modulo of two durations.
`opBinary`	Multiplies or divides the duration by an integer value.
`opBinary`	Divides two durations.
`opBinaryRight`	Adds or subtracts two durations.
`opBinaryRight`	Multiplies an integral value and a `Duration`.
`opCast`	Returns a `TickDuration` with the same number of hnsecs as this `Duration`. Note that the conventional way to convert between `Duration` and `TickDuration` is using `to`, e.g.: `duration.to!TickDuration()`
`opCast`	Allow Duration to be used as a boolean.
`opCmp`	Compares this `Duration` with the given `Duration`.
`opOpAssign`	Adds, subtracts or calculates the modulo of two durations as well as assigning the result to this `Duration`.
`opOpAssign`	Multiplies/Divides the duration by an integer value as well as assigning the result to this `Duration`.
`opUnary`	Returns the negation of this `Duration`.
`toString`	Converts this `Duration` to a `string`.

Templates

Name	Description
`split`	Splits out the Duration into the given units.

Examples

import std.datetime;

assert(dur!"days"(12) == dur!"hnsecs"(10_368_000_000_000L));
assert(dur!"hnsecs"(27) == dur!"hnsecs"(27));
assert(std.datetime.Date(2010, 9, 7) + dur!"days"(5) ==
       std.datetime.Date(2010, 9, 12));

assert(days(-12) == dur!"hnsecs"(-10_368_000_000_000L));
assert(hnsecs(-27) == dur!"hnsecs"(-27));
assert(std.datetime.Date(2010, 9, 7) - std.datetime.Date(2010, 10, 3) ==
       days(-26));

Example

import core.time;

// using the dur template
auto numDays = dur!"days"(12);

// using the days function
numDays = days(12);

// alternatively using UFCS syntax
numDays = 12.days;

auto myTime = 100.msecs + 20_000.usecs + 30_000.hnsecs;
writeln(myTime); // 123.msecs

Authors

Jonathan M Davis and Kato Shoichi

License

Boost License 1.0.