libstdc++
Public Member Functions | List of all members
std::_V2::error_category Class Referenceabstract
Diagnostics

#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
 
bool operator!= (const error_category &__other) const noexcept
 
bool operator< (const error_category &__other) 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 104 of file system_error.

Member Function Documentation

◆ default_error_condition()

virtual error_condition std::_V2::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::_V2::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::_V2::error_category::equivalent ( int  __i,
const error_condition &  __cond 
) const
virtualnoexcept

Test whether cond corresponds to i for this category.

◆ name()

virtual const char * std::_V2::error_category::name ( ) const
pure virtualnoexcept

A string that identifies the error category.

◆ operator!=()

bool std::_V2::error_category::operator!= ( const error_category &  __other) const
inlinenoexcept

Definition at line 173 of file system_error.

◆ operator<()

bool std::_V2::error_category::operator< ( const error_category &  __other) const
inlinenoexcept

Ordered comparison that defines a total order for error categories.

Definition at line 168 of file system_error.

◆ operator==()

bool std::_V2::error_category::operator== ( const error_category &  __other) const
inlinenoexcept

An error_category only compares equal to itself.

Definition at line 158 of file system_error.

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