std::::error_category - Man Page
std::error_category
Synopsis
#include <system_error>
Public Member Functions
error_category (const error_category &)=delete
virtual error_condition default_error_condition (int __i) const noexcept
Return an error_condition corresponding to i in this category.
virtual bool equivalent (const error_code &__code, int __i) const noexcept
Test whether code corresponds to i for this category.
virtual bool equivalent (int __i, const error_condition &__cond) const noexcept
Test whether cond corresponds to i for this category.
virtual string message (int) const =0
A description of the error condition corresponding to the number.
virtual const char * name () const noexcept=0
A string that identifies the error category.
strong_ordering operator<=> (const error_category &__rhs) const noexcept
Ordered comparison that defines a total order for error categories.
error_category & operator= (const error_category &)=delete
bool operator== (const error_category &__other) const noexcept
An error_category only compares equal to itself.
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
Member Function Documentation
virtual error_condition std::error_category::default_error_condition (int __i) const [virtual], [noexcept]
Return an error_condition corresponding to i in this category.
virtual bool std::error_category::equivalent (const error_code & __code, int __i) const [virtual], [noexcept]
Test whether code corresponds to i for this category.
virtual bool std::error_category::equivalent (int __i, const error_condition & __cond) const [virtual], [noexcept]
Test whether cond corresponds to i for this category.
virtual string std::error_category::message (int ) const [pure virtual]
A description of the error condition corresponding to the number.
virtual const char * std::error_category::name () const [pure virtual], [noexcept]
A string that identifies the error category.
strong_ordering std::error_category::operator<=> (const error_category & __rhs) const [inline], [nodiscard], [noexcept]
Ordered comparison that defines a total order for error categories.
bool std::error_category::operator== (const error_category & __other) const [inline], [noexcept]
An error_category only compares equal to itself.
Author
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