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fix mistake in documents

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Fred 2021-08-09 13:57:41 +08:00
parent b702c2f18a
commit cab1bed3f3
1 changed files with 3 additions and 3 deletions
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doc/chrono.qbk
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@ -775,7 +775,7 @@ You can use __duration_cast`<>` to convert the __duration into whatever units yo
// d now holds the number of milliseconds from start to end.
std::cout << ms.count() << "ms\n";
std::cout << d.count() << "ms\n";
We can convert to __nanoseconds, or some integral-based duration which __nanoseconds will always exactly convert to, then __duration_cast`<>` is unnecessary:
@ -808,7 +808,7 @@ If you need to use __duration_cast`<>`, but want to round up, instead of down wh
typedef boost::chrono::__milliseconds ms;
ms d = round_up<ms>(end - start);
// d now holds the number of milliseconds from start to end, rounded up.
std::cout << ms.count() << "ms\n";
std::cout << d.count() << "ms\n";
[endsect]
@ -1199,7 +1199,7 @@ You can use __thread_clock whenever you want to measure the time spent by the cu
typedef boost::chrono::__milliseconds ms;
ms d = boost::chrono::__thread_clock::now() - start;
// d now holds the number of milliseconds from start to end.
std::cout << ms.count() << "ms\n";
std::cout << d.count() << "ms\n";
If you need seconds with a floating-point representation you can do: