tmp/tmpm4a1c7bu/{from.md → to.md}
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#### Class template `clock_time_conversion` <a id="time.clock.conv">[[time.clock.conv]]</a>
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``` cpp
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namespace std::chrono {
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template<class DestClock, class SourceClock>
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struct clock_time_conversion {};
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}
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```
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`clock_time_conversion` serves as a trait which can be used to specify
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how to convert a source `time_point` of type
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`time_point<SourceClock, Duration>` to a destination `time_point` of
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type `time_point<DestClock, Duration>` via a specialization:
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`clock_time_conversion<DestClock, SourceClock>`. A specialization of
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`clock_time_conversion<DestClock, SourceClock>` shall provide a
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const-qualified `operator()` that takes a parameter of type
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`time_point<SourceClock, Duration>` and returns a
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`time_point<DestClock, OtherDuration>` representing an equivalent point
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in time. `OtherDuration` is a `chrono::duration` whose specialization is
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computed from the input `Duration` in a manner which can vary for each
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`clock_time_conversion` specialization. A program may specialize
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`clock_time_conversion` if at least one of the template parameters is a
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user-defined clock type.
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Several specializations are provided by the implementation, as described
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in [[time.clock.cast.id]], [[time.clock.cast.sys.utc]],
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[[time.clock.cast.sys]], and [[time.clock.cast.utc]].
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