std::error_code

 

C++

Language

Standard library headers

Concepts

Utilities library

Strings library

Containers library

Algorithms library

Iterators library

Numerics library

Input/output library

Localizations library

Regular expressions library (C++11)

Atomic operations library (C++11)

Thread support library (C++11)

Technical Specifications

 

Utilities library

Type support (basic types, RTTI, type traits)

Dynamic memory management

Error handling

Program utilities

Variadic functions

Date and time

Function objects

initializer_list (C++11)

bitset

hash (C++11)

Relational operators

rel_ops::operator!=rel_ops::operator>rel_ops::operator<=rel_ops::operator>=

Optional and any

optional (C++17)

any (C++17)

Pairs and tuples

pair

tuple (C++11)

apply (C++17)

piecewise_construct_t (C++11)

piecewise_construct (C++11)

integer_sequence (C++14)

Swap, forward and move

swap

exchange (C++14)

forward (C++11)

move (C++11)

move_if_noexcept (C++11)

Type operations

declval (C++11)

as_const (C++17)

 

Error handling

Exception handling exception uncaught_exceptionuncaught_exceptions (C++17) exception_ptr (C++11) make_exception_ptr (C++11) current_exception (C++11) rethrow_exception (C++11) nested_exception (C++11) throw_with_nested (C++11) rethrow_if_nested (C++11) exception_list (C++17) Exception handling failures terminate terminate_handler get_terminate (C++11) set_terminate unexpected (deprecated) bad_exception unexpected_handler (deprecated) get_unexpected (C++11)(deprecated) set_unexpected (deprecated)

Exception categories logic_error invalid_argument domain_error length_error out_of_range runtime_error range_error overflow_error underflow_error Error codes Error codes errno Assertions assert system_error facility error_category (C++11) generic_category (C++11) system_category (C++11) error_condition (C++11) errc (C++11) error_code (C++11) system_error (C++11)

 

std::error_code

Member functions

error_code::error_code

error_code::operator=

error_code::assign

Modifiers

error_code::clear

Observers

error_code::value

error_code::category

error_code::default_error_condition

error_code::message

error_code::operator bool

Non-member functions

operator< operator== operator!=

operator<<

Helper classes

is_error_code_enum

hash<std::error_code>

 

Defined in header <system_error>
class error_code;		(since C++11)

std::error_code is a platform-dependent error code. Each std::error_code object holds a pair of error code originating from the operating system, or some low-level interface and a pointer to an object of type std::error_category, which corresponds to the said interface. The error code values may be not unique across different error categories.

Member functions

(constructor)	constructs an error code (public member function)
operator=	assigns another error code (public member function)
assign	assigns another error code (public member function)
Modifiers
clear	sets the error_code to value 0 in system_category (public member function)
Observers
value	obtains the value of the error_code (public member function)
category	obtains the error_category for this error_code (public member function)
default_error_condition	obtains the error_condition for this error_code (public member function)
message	obtains the explanatory string for this error_code (public member function)
operator bool	checks if the value is non-zero (public member function)

Non-member functions

operator==operator!=operator<	compares two error_codes (function)
operator<<	outputs the value and the category name to an output stream (function)

Helper classes

is_error_code_enum (C++11)	identifies a class as an error_code enumeration (class template)
std::hash<std::error_code> (C++11)	hash support for std::error_code (class template specialization)

See also

error_condition (C++11)	holds a portable error code (class)
error_category (C++11)	base class for error categories (class)