core.time.MonoTimeImpl.opBinary
- multiple declarations
Function MonoTimeImpl.opBinary
Subtracting two MonoTimes results in a Duration
representing
the amount of time which elapsed between them.
The primary way that programs should time how long something takes is to do
MonoTime before = MonoTime .currTime;
// do stuff
MonoTime after = MonoTime .currTime;
// How long it took.
Duration timeElapsed = after - before;
or to use a wrapper (such as a stop watch type) which does that.
Warning:
Because Duration
is in hnsecs, whereas MonoTime is in system
ticks, it's usually the case that this assertion will fail
auto before = MonoTime .currTime;
// do stuff
auto after = MonoTime .currTime;
auto timeElapsed = after - before;
assert(before + timeElapsed == after);
This is generally fine, and by its very nature, converting from
system ticks to any type of seconds (hnsecs, nsecs, etc.) will
introduce rounding errors, but if code needs to avoid any of the
small rounding errors introduced by conversion, then it needs to use
MonoTime's ticks
property and keep all calculations in ticks
rather than using Duration
.
Function MonoTimeImpl.opBinary
Adding or subtracting a Duration
to/from a MonoTime results in
a MonoTime which is adjusted by that amount.
MonoTimeImpl opBinary(string op)
(
Duration rhs
) const pure nothrow @nogc
if (op == "+" || op == "-");
Authors
Jonathan M Davis and Kato Shoichi