std::chrono::ambiguous_local_time

 

C++

Compiler support

Freestanding and hosted

Language

Standard library

Standard library headers

Named requirements

Feature test macros(C++20)

Language support library

Concepts library(C++20)

Diagnostics library

Memory management library

Metaprogramming library(C++11)

General utilities library

Containers library

Iterators library

Ranges library(C++20)

Algorithms library

Strings library

Text processing library

Numerics library

Date and time library

Input/output library

Filesystem library(C++17)

Concurrency support library(C++11)

Execution control library(C++26)

Technical specifications

Symbols index

External libraries

 

Date and time library

Time point time_point (C++11) clock_time_conversion (C++20)   clock_cast (C++20) Duration duration (C++11) Clocks system_clock (C++11) steady_clock (C++11) is_clock (C++20) utc_clock (C++20) tai_clock (C++20) high_resolution_clock (C++11) gps_clock (C++20) file_clock (C++20) local_t (C++20) Time of day is_amis_pm (C++20)(C++20) make12make24 (C++20)(C++20) hh_mm_ss (C++20)

Calendar day (C++20) month (C++20) year (C++20) weekday (C++20) operator/ (C++20) year_month_day (C++20) year_month_day_last (C++20) year_month_weekday (C++20) year_month_weekday_last (C++20)   weekday_indexed (C++20) weekday_last (C++20) month_day (C++20) month_day_last (C++20) month_weekday (C++20) month_weekday_last (C++20) year_month (C++20) last_speclast (C++20)(C++20) chrono I/O parse (C++20)

Time zone tzdb (C++20) tzdb_list (C++20) get_tzdbget_tzdb_listreload_tzdbremote_version (C++20)(C++20)(C++20)(C++20) sys_info (C++20) local_info (C++20) nonexistent_local_time (C++20) ambiguous_local_time (C++20) locate_zone (C++20) current_zone (C++20) time_zone (C++20) choose (C++20) zoned_traits (C++20) zoned_time (C++20) time_zone_link (C++20) leap_second (C++20) leap_second_info (C++20) get_leap_second_info (C++20) C-style date and time

 

Defined in header <chrono>
class ambiguous_local_time;		(since C++20)

Defines a type of object to be thrown as exception to report that an attempt was made to convert an ambiguous std::chrono::local_time to a std::chrono::sys_time without specifying a std::chrono::choose (such as choose::earliest or choose::latest).

This exception is thrown by std::chrono::time_zone::to_sys and functions that call it (such as the constructors of std::chrono::zoned_time that take a std::chrono::local_time).

Inheritance diagram

Member functions

(constructor)	constructs the exception object (public member function)
operator=	replaces the exception object (public member function)
what	returns the explanatory string (public member function)

std::chrono::ambiguous_local_time::ambiguous_local_time

template<class Duration > ambiguous_local_time(conststd::chrono::local_time<Duration>& tp,                       conststd::chrono::local_info& i );	(1)	(since C++20)
ambiguous_local_time(const ambiguous_local_time& other )noexcept;	(2)	(since C++20)

Constructs the exception object.

1) The explanatory string returned by what() is equivalent to that produced by os.str() after the following code:

std::ostringstream os; os << tp <<" is ambiguous. It could be\n"<< tp <<' '<< i.first.abbrev<<" == "<< tp - i.first.offset<<" UTC or\n"<< tp <<' '<< i.second.abbrev<<" == "<< tp - i.second.offset<<" UTC";

The behavior is undefined if i.result!= std::chrono::local_info::ambiguous.

2) Copy constructor. If *this and other both have dynamic type std::chrono::ambiguous_local_time then std::strcmp(what(), other.what())==0.

Parameters

tp	-	the time point for which conversion was attempted
i	-	a std::chrono::local_info describing the result of the conversion attempt
other	-	another ambiguous_local_time to copy

Exceptions

May throw std::bad_alloc

Notes

Because copying a standard library class derived from std::exception is not permitted to throw exceptions, this message is typically stored internally as a separately-allocated reference-counted string.

std::chrono::ambiguous_locale_time::operator=

ambiguous_locale_time& operator=(const ambiguous_locale_time& other )noexcept;		(since C++20)

Assigns the contents with those of other.If *this and other both have dynamic type std::chrono::ambiguous_locale_time then std::strcmp(what(), other.what())==0 after assignment.

Parameters

other

-

another exception object to assign with

Return value

*this

std::chrono::ambiguous_locale_time::what

virtualconstchar* what()constnoexcept;		(since C++20)

Returns the explanatory string.

Return value

Pointer to an implementation-defined null-terminated string with explanatory information. The string is suitable for conversion and display as a std::wstring. The pointer is guaranteed to be valid at least until the exception object from which it is obtained is destroyed, or until a non-const member function (e.g. copy assignment operator) on the exception object is called.

The returned string is encoded with the ordinary literal encoding during constant evaluation.

(since C++26)

Notes

Implementations are allowed but not required to override what().

Inherited from std::runtime_error

Inherited from std::exception

Member functions

(destructor) [virtual]	destroys the exception object (virtual public member function of std::exception)
what [virtual]	returns an explanatory string (virtual public member function of std::exception)

See also

nonexistent_local_time (C++20)

exception thrown to report that a local time is nonexistent (class)