Exceptions

Collaboration diagram for Exceptions:

Classes
class	__cxxabiv1::__forced_unwind
class	std::bad_alloc
class	std::experimental::fundamentals_v1::bad_any_cast
class	std::bad_cast
class	std::bad_exception
class	std::bad_function_call
class	std::experimental::fundamentals_v1::bad_optional_access
class	std::bad_typeid
class	std::bad_weak_ptr
class	std::domain_error
class	std::exception
class	std::__unspecified__::exception_ptr
struct	__gnu_cxx::forced_error
class	std::future_error
class	std::invalid_argument
class	std::length_error
class	std::logic_error
class	std::nested_exception
class	std::out_of_range
class	std::overflow_error
class	std::range_error
class	__gnu_cxx::recursive_init_error
class	std::regex_error
class	std::runtime_error
class	std::system_error
class	std::underflow_error

Typedefs
typedef void(*	std::terminate_handler) ()
typedef void(*	std::unexpected_handler) ()

Functions
void	__gnu_cxx::__verbose_terminate_handler ()
exception_ptr	std::current_exception () noexcept
terminate_handler	std::get_terminate () noexcept
unexpected_handler	std::get_unexpected () noexcept
template<typename _Ex>
exception_ptr	std::make_exception_ptr (_Ex __ex) noexcept
void	std::rethrow_exception (exception_ptr)
template<typename _Ex>
void	std::rethrow_if_nested (const _Ex &__ex)
terminate_handler	std::set_terminate (terminate_handler) noexcept
unexpected_handler	std::set_unexpected (unexpected_handler) noexcept
void	std::terminate () noexcept
template<typename _Tp>
void	std::throw_with_nested (_Tp &&__t)
bool	std::uncaught_exception () noexcept
void	std::unexpected ()

Variables
class __attribute((__abi_tag__("cxx11"))) failure typedef _Ios_Fmtflags	std::ios_base::fmtflags

Detailed Description

Since

C++98

Classes and functions for reporting errors via exceptions.

Typedef Documentation

terminate_handler

typedef void(* std::terminate_handler) ()

If you write a replacement terminate handler, it must be of this type.

Definition at line 82 of file exception.

unexpected_handler

typedef void(* std::unexpected_handler) ()

If you write a replacement unexpected handler, it must be of this type.

Definition at line 98 of file exception.

Function Documentation

__verbose_terminate_handler()

void __gnu_cxx::__verbose_terminate_handler

(

)

A replacement for the standard terminate_handler which prints more information about the terminating exception (if any) on stderr.

Call

std::set_terminate(__gnu_cxx::__verbose_terminate_handler)

to use. For more info, see http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt02ch06s02.html

In 3.4 and later, this is on by default.

current_exception()

exception_ptr std::current_exception ( )

noexcept

Obtain an exception_ptr to the currently handled exception.

If there is none, or the currently handled exception is foreign, return the null value.

Since

C++11

References make_exception_ptr().

Referenced by std::nested_exception::nested_exception(), and make_exception_ptr().

get_terminate()

terminate_handler std::get_terminate ( )

noexcept

Return the current terminate handler.

get_unexpected()

unexpected_handler std::get_unexpected ( )

noexcept

Return the current unexpected handler.

Since

C++11

Deprecated

Removed from the C++ standard in C++17

make_exception_ptr()

template<typename _Ex>

exception_ptr std::make_exception_ptr ( _Ex __ex )

noexcept

Obtain an exception_ptr pointing to a copy of the supplied object.

Definition at line 306 of file exception_ptr.h.

References current_exception().

Referenced by current_exception().

rethrow_exception()

void std::rethrow_exception

(

exception_ptr

)

Throw the object pointed to by the exception_ptr.

References rethrow_exception().

Referenced by rethrow_exception(), and std::nested_exception::rethrow_nested().

rethrow_if_nested()

template<typename _Ex>

void std::rethrow_if_nested ( const _Ex & __ex )

inline

Rethrow a nested exception

If __ex contains a std::nested_exception object, call its rethrow_nested() member to rethrow the stored exception.

After catching an exception thrown by a call to std::throw_with_nested this function can be used to rethrow the exception that was active when std::throw_with_nested was called.

Since

C++11

Definition at line 215 of file nested_exception.h.

set_terminate()

terminate_handler std::set_terminate ( terminate_handler )

noexcept

Takes a new handler function as an argument, returns the old function.

set_unexpected()

unexpected_handler std::set_unexpected ( unexpected_handler )

noexcept

Takes a new handler function as an argument, returns the old function.

Deprecated

Removed from the C++ standard in C++17

terminate()

void std::terminate ( )

noexcept

The runtime will call this function if exception handling must be abandoned for any reason. It can also be called by the user.

Referenced by std::nested_exception::rethrow_nested().

throw_with_nested()

template<typename _Tp>

void std::throw_with_nested ( _Tp && __t )

inline

Throw an exception that also stores the currently active exception.

If _Tp is derived from std::nested_exception or is not usable as a base-class, throws a copy of __t. Otherwise, throws an object of an implementation-defined type derived from both _Tp and std::nested_exception, containing a copy of __t and the result of std::current_exception().

In other words, throws the argument as a new exception that contains the currently active exception nested within it. This is intended for use in a catch handler to replace the caught exception with a different type, while still preserving the original exception. When the new exception is caught, the nested exception can be rethrown by using std::rethrow_if_nested.

This can be used at API boundaries, for example to catch a library's internal exception type and rethrow it nested with a std::runtime_error, or vice versa.

Since

C++11

Definition at line 155 of file nested_exception.h.

References forward().

uncaught_exception()

bool std::uncaught_exception ( )

noexcept

[18.6.4]/1: 'Returns true after completing evaluation of a throw-expression until either completing initialization of the exception-declaration in the matching handler or entering unexpected() due to the throw; or after entering terminate() for any reason other than an explicit call to terminate(). [Note: This includes stack unwinding [15.2]. end note]'

2: 'When uncaught_exception() is true, throwing an exception can result in a call of 1terminate()‘ (15.5.1).’

Referenced by std::basic_ostream< _CharT, _Traits >::sentry::~sentry().

unexpected()

void std::unexpected

(

)

The runtime will call this function if an exception is thrown which violates the function's exception specification.

Deprecated

Removed from the C++ standard in C++17

Variable Documentation

fmtflags

class __attribute ((__abi_tag__ ("cxx11"))) failure typedef _Ios_Fmtflags std::ios_base::fmtflags

These are thrown to indicate problems with io.

27.4.2.1.1 Class ios_base::failure

This is a bitmask type.

_Ios_Fmtflags is implementation-defined, but it is valid to perform bitwise operations on these values and expect the Right Thing to happen. Defined objects of type fmtflags are:

• boolalpha
• dec
• fixed
• hex
• internal
• left
• oct
• right
• scientific
• showbase
• showpoint
• showpos
• skipws
• unitbuf
• uppercase
• adjustfield
• basefield
• floatfield

Definition at line 378 of file ios_base.h.

Referenced by std::num_get< _CharT, _InIter >::do_get(), std::num_put< _CharT, _OutIter >::do_put(), std::num_put< _CharT, _OutIter >::do_put(), flags(), std::__detail::operator>>(), register_callback(), setf(), setf(), and unsetf().