std::error_category Class Reference

#include <system_error>

Public Member Functions
	error_category (const error_category &)=delete
virtual error_condition	default_error_condition (int __i) const noexcept
virtual bool	equivalent (const error_code &__code, int __i) const noexcept
virtual bool	equivalent (int __i, const error_condition &__cond) const noexcept
virtual string	message (int) const =0
virtual const char *	name () const noexcept=0
strong_ordering	operator<=> (const error_category &__rhs) const noexcept
error_category &	operator= (const error_category &)=delete
bool	operator== (const error_category &__other) const noexcept

Detailed Description

Abstract base class for types defining a category of error codes.

An error category defines a context that gives meaning to the integer stored in an error_code or error_condition object. For example, the standard errno constants such a EINVAL and ENOMEM are associated with the "generic" category and other OS-specific error numbers are associated with the "system" category, but a user-defined category might give different meanings to the same numerical values.

A user-defined category can override the equivalent member functions to define correspondence between errors in different categories. For example, a category for errors from disk I/O could consider some of its error numbers equivalent to ENOSPC and ENOENT in the generic category.

Since

C++11

Definition at line 108 of file system_error.

Member Function Documentation

default_error_condition()

virtual error_condition std::error_category::default_error_condition ( int __i ) const

virtualnoexcept

Return an error_condition corresponding to i in this category.

equivalent() [1/2]

virtual bool std::error_category::equivalent ( const error_code & __code, int __i ) const

virtualnoexcept

Test whether code corresponds to i for this category.

equivalent() [2/2]

virtual bool std::error_category::equivalent ( int __i, const error_condition & __cond ) const

virtualnoexcept

Test whether cond corresponds to i for this category.

message()

virtual string std::error_category::message ( int ) const

pure virtual

A description of the error condition corresponding to the number.

name()

virtual const char * std::error_category::name ( ) const

pure virtualnoexcept

A string that identifies the error category.

operator<=>()

strong_ordering std::error_category::operator<=> ( const error_category & __rhs ) const

inlinenodiscardnoexcept

Ordered comparison that defines a total order for error categories.

Definition at line 168 of file system_error.

operator==()

bool std::error_category::operator== ( const error_category & __other ) const

inlinenoexcept

An error_category only compares equal to itself.

Definition at line 162 of file system_error.

---

The documentation for this class was generated from the following file:

• system_error