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Difference between revisions of "cpp/chrono/file clock/to from sys"

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< cpp‎ | chrono‎ | file clock
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{{cpp/chrono/file_clock/navbar}}
 
{{cpp/chrono/file_clock/navbar}}
 
{{dcl begin}}
 
{{dcl begin}}
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{{dcl|num=1|since=c++20|notes={{mark optional}} |1=
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{{dcl|num=1|since=c++20|notes={{mark tooltip|optional|provided only if to_utc and from_utc are not provided}}|
−
template <class Duration>
+
template< class Duration >
 
static std::chrono::sys_time</*see below*/>
 
static std::chrono::sys_time</*see below*/>
−
     to_sys(const std::chrono::file_time<Duration>& t);
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     to_sys( const std::chrono::file_time<Duration>& t );
 
}}
 
}}
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{{dcl|num=2|since=c++20|notes={{mark optional}} |1=
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{{dcl|num=2|since=c++20|notes={{mark tooltip|optional|provided only if to_utc and from_utc are not provided}}|
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template <class Duration>
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template< class Duration >
 
static std::chrono::file_time</*see below*/>
 
static std::chrono::file_time</*see below*/>
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     from_sys(const std::chrono::sys_time<Duration>& t);
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     from_sys( const std::chrono::sys_time<Duration>& t );
 
}}
 
}}
 
{{dcl end}}
 
{{dcl end}}
  
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@1@ Converts the {{tt|file_time}} {{tt|t}} to a {{tt|sys_time}} representing the same point in time.
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@1@ Converts the {{tt|file_time}} {{c|t}} to a {{tt|sys_time}} representing the same point in time.
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@2@ Converts the {{tt|sys_time}} {{tt|t}} to a {{tt|file_time}} representing the same point in time.
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@2@ Converts the {{tt|sys_time}} {{c|t}} to a {{tt|file_time}} representing the same point in time.
  
 
The duration of the return type is computed from {{tt|Duration}} in an unspecified manner.
 
The duration of the return type is computed from {{tt|Duration}} in an unspecified manner.
  
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These function templates are optional: an implementation may choose to instead provide {{tt|to_utc}} and {{tt|from_utc}}.
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These function templates are optional: an implementation may choose to instead provide {{rlpf|to from utc|to_utc}} and {{rlpf|to from utc|from_utc}}.
  
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=== Return value ===
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===Return value===
 
@1@ A {{tt|sys_time}} representing the same point in time as the argument.
 
@1@ A {{tt|sys_time}} representing the same point in time as the argument.
 
@2@ A {{tt|file_time}} representing the same point in time as the argument.
 
@2@ A {{tt|file_time}} representing the same point in time as the argument.
  
−
=== Notes ===
+
===Notes===
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User code should usually use {{lc|std::chrono::clock_cast}}, which provides a generic interface to convert time points between clocks, rather than call these functions directly.
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User code should usually use {{c/core|std::chrono::clock_cast}}, which provides a generic interface to convert time points between clocks, rather than call these functions directly.
  
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=== See also ===
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===Example===
 +
{{example}}
 +
 
 +
===See also===
 
{{dsc begin}}
 
{{dsc begin}}
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{{dsc inc |cpp/chrono/file clock/dsc to from utc}}
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{{dsc inc|cpp/chrono/file clock/dsc to from utc}}
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{{dsc inc |cpp/chrono/dsc clock_cast}}
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{{dsc inc|cpp/chrono/dsc clock_cast}}
 
{{dsc end}}
 
{{dsc end}}
  
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{{langlinks|ja|zh}}
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{{langlinks|es|ja|ru|zh}}

Latest revision as of 17:22, 1 November 2024

 
C++
 
Utilities library
General utilities
Relational operators (deprecated in C++20)
 
Date and time utilities
Time point
(C++11)
(C++20)
Duration
(C++11)
Clocks
(C++11)
(C++11)
(C++20)
(C++20)
(C++20)
(C++20)
Time of day
(C++20)(C++20)
(C++20)(C++20)
(C++20)

Calendar
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)(C++20)
Time zone
(C++20)
(C++20)
(C++20)(C++20)(C++20)(C++20)  
(C++20)
chrono I/O
(C++20)
C-style date and time
 
std::chrono::file_clock
Member functions

file_clock::to_sysfile_clock::from_sys
(optional*)

(optional*)
Time point I/O
 
template< class Duration >

static std::chrono::sys_time</*see below*/>

    to_sys( const std::chrono::file_time<Duration>& t );
 (1) (since C++20)
(optional*)
template< class Duration >

static std::chrono::file_time</*see below*/>

    from_sys( const std::chrono::sys_time<Duration>& t );
 (2) (since C++20)
(optional*)
1) Converts the file_time t to a sys_time representing the same point in time.
2) Converts the sys_time t to a file_time representing the same point in time.

The duration of the return type is computed from Duration in an unspecified manner.

These function templates are optional: an implementation may choose to instead provide to_utc() and from_utc().

Contents

[edit] Return value

1) A sys_time representing the same point in time as the argument.
2) A file_time representing the same point in time as the argument.

[edit] Notes

User code should usually use std::chrono::clock_cast, which provides a generic interface to convert time points between clocks, rather than call these functions directly.

[edit] Example

This section is incomplete
Reason: no example

[edit] See also

[static] (optional)
 converts between file_time and utc_time
(public static member function) [edit]
(C++20)
 convert time points of one clock to another
(function template) [edit]
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