std::chrono::ambiguous_local_time(3)

NAME
std::chrono::ambiguous_local_time - std::chrono::ambiguous_local_time

Synopsis
   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).
   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, (1) (since C++20)
                        const std::chrono::local_info& i );
   ambiguous_local_time( const ambiguous_local_time& other ) (2) (since C++20)
   noexcept;
   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 (since C++20)
   ) noexcept;
   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
   virtual const char* what() const noexcept; (since C++20)
   Returns the explanatory string.

Parameters
   (none)

Return value
   Pointer to a 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.

Notes
   Implementations are allowed but not required to override what(). Inherited from std::runtime_error Inherited from std::exception

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

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