tmp/tmpi_6zo5vi/{from.md → to.md}
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| 1 |
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#### Suffixes for duration literals <a id="time.duration.literals">[[time.duration.literals]]</a>
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This section describes literal suffixes for constructing duration
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literals. The suffixes `h`, `min`, `s`, `ms`, `us`, `ns` denote duration
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values of the corresponding types `hours`, `minutes`, `seconds`,
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`milliseconds`, `microseconds`, and `nanoseconds` respectively if they
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are applied to integral literals.
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If any of these suffixes are applied to a floating point literal the
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result is a `chrono::duration` literal with an unspecified floating
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point representation.
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If any of these suffixes are applied to an integer literal and the
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resulting `chrono::duration` value cannot be represented in the result
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type because of overflow, the program is ill-formed.
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The following code shows some duration literals.
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``` cpp
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using namespace std::chrono_literals;
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auto constexpr aday=24h;
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auto constexpr lesson=45min;
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auto constexpr halfanhour=0.5h;
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```
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``` cpp
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constexpr chrono::hours operator "" h(unsigned long long hours);
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constexpr chrono::duration<unspecified, ratio<3600,1>> operator "" h(long double hours);
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```
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*Returns:* A `duration` literal representing `hours` hours.
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``` cpp
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constexpr chrono::minutes operator "" min(unsigned long long minutes);
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constexpr chrono::duration<unspecified, ratio<60,1>> operator "" min(long double minutes);
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```
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*Returns:* A `duration` literal representing `minutes` minutes.
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``` cpp
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constexpr chrono::seconds operator "" s(unsigned long long sec);
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constexpr chrono::duration<unspecified> operator "" s(long double sec);
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```
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*Returns:* A `duration` literal representing `sec` seconds.
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The same suffix `s` is used for `basic_string` but there is no conflict,
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since duration suffixes apply to numbers and string literal suffixes
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apply to character array literals.
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``` cpp
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constexpr chrono::milliseconds operator "" ms(unsigned long long msec);
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constexpr chrono::duration<unspecified, milli> operator "" ms(long double msec);
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```
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*Returns:* A `duration` literal representing `msec` milliseconds.
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``` cpp
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constexpr chrono::microseconds operator "" us(unsigned long long usec);
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constexpr chrono::duration<unspecified, micro> operator "" us(long double usec);
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```
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*Returns:* A `duration` literal representing `usec` microseconds.
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``` cpp
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constexpr chrono::nanoseconds operator "" ns(unsigned long long nsec);
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constexpr chrono::duration<unspecified, nano> operator "" ns(long double nsec);
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```
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*Returns:* A `duration` literal representing `nsec` nanoseconds.
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