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std::chrono::nonexistent_local_time

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

Defines a type of object to be thrown as exception to report that an attempt was made to convert a nonexistent 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 takes a std::chrono::local_time).

cpp/error/exceptioncpp/error/runtime errorstd-chrono-nonexistent local time-inheritance.svg
About this image

Inheritance diagram

Contents

[edit] 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::nonexistent_local_time::nonexistent_local_time

template< class Duration >

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

                        const std::chrono::local_info& i );
(1) (since C++20)
nonexistent_local_time( const nonexistent_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 in a gap between\n"
   << std::chrono::local_seconds(i.first.end.time_since_epoch()) + i.first.offset 
   << ' ' << i.first.abbrev << " and\n"
   << std::chrono::local_seconds(i.second.begin.time_since_epoch()) + i.second.offset
   << ' ' << i.second.abbrev
   << " which are both equivalent to\n"
   << i.first.end << " UTC";
The behavior is undefined if i.result != std::chrono::local_info::nonexistent.
2) Copy constructor. If *this and other both have dynamic type std::chrono::nonexistent_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 nonexistent_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::nonexistent_locale_time::operator=

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

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

Parameters

other - another exception object to assign with

Return value

*this

std::chrono::nonexistent_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

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