std::chrono::ambiguous_local_time

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ambiguous_local_time
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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

cpp/error/exception cpp/error/runtime error std-chrono-ambiguous local time-inheritance.svg

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( const std::chrono::local_time <Duration> & tp,

const std::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() 
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

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

Parameters

other - another exception object to assign with

Return value

*this

std::chrono::ambiguous_locale_time::what

virtual const char * what( ) const noexcept ;
(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 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

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

See also

(C++20)
 exception thrown to report that a local time is nonexistent
(class)
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