.TH "std::error_category" 3cxx "libstdc++" \" -*- nroff -*-
.ad l
.nh
.SH NAME
std::error_category
.SH SYNOPSIS
.br
.PP
.PP
\fC#include <system_error>\fP
.SS "Public Member Functions"

.in +1c
.ti -1c
.RI "\fBerror_category\fP (const \fBerror_category\fP &)=\fBdelete\fP"
.br
.ti -1c
.RI "\fBvirtual\fP \fBerror_condition\fP \fBdefault_error_condition\fP (int __i) const noexcept"
.br
.RI "Return an error_condition corresponding to \fCi\fP in this category\&. "
.ti -1c
.RI "\fBvirtual\fP bool \fBequivalent\fP (const \fBerror_code\fP &\fB__code\fP, int __i) const noexcept"
.br
.RI "Test whether \fCcode\fP corresponds to \fCi\fP for this category\&. "
.ti -1c
.RI "\fBvirtual\fP bool \fBequivalent\fP (int __i, const \fBerror_condition\fP &\fB__cond\fP) const noexcept"
.br
.RI "Test whether \fCcond\fP corresponds to \fCi\fP for this category\&. "
.ti -1c
.RI "\fBvirtual\fP \fBstring\fP \fBmessage\fP (int) const =0"
.br
.ti -1c
.RI "\fBvirtual\fP const char * \fBname\fP () const noexcept=0"
.br
.RI "A string that identifies the error category\&. "
.ti -1c
.RI "bool \fBoperator!=\fP (const \fBerror_category\fP &__other) const noexcept"
.br
.ti -1c
.RI "bool \fBoperator<\fP (const \fBerror_category\fP &__other) const noexcept"
.br
.RI "Ordered comparison that defines a total order for error categories\&. "
.ti -1c
.RI "\fBerror_category\fP & \fBoperator=\fP (const \fBerror_category\fP &)=\fBdelete\fP"
.br
.ti -1c
.RI "bool \fBoperator==\fP (const \fBerror_category\fP &__other) const noexcept"
.br
.RI "An error_category only compares equal to itself\&. "
.in -1c
.SH "Detailed Description"
.PP 
Abstract base class for types defining a category of error codes\&.
.PP
An error category defines a context that gives meaning to the integer stored in an \fCerror_code\fP or \fCerror_condition\fP object\&. For example, the standard \fCerrno\fP constants such a \fCEINVAL\fP and \fCENOMEM\fP 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\&.
.PP
A user-defined category can override the \fCequivalent\fP 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\&.
.PP
\fBSince\fP
.RS 4
C++11 
.RE
.PP

.SH "Member Function Documentation"
.PP 
.SS "\fBvirtual\fP \fBerror_condition\fP std::error_category::default_error_condition (int __i) const\fC [virtual]\fP, \fC [noexcept]\fP"

.PP
Return an error_condition corresponding to \fCi\fP in this category\&. 
.SS "\fBvirtual\fP bool std::error_category::equivalent (const \fBerror_code\fP & __code, int __i) const\fC [virtual]\fP, \fC [noexcept]\fP"

.PP
Test whether \fCcode\fP corresponds to \fCi\fP for this category\&. 
.SS "\fBvirtual\fP bool std::error_category::equivalent (int __i, const \fBerror_condition\fP & __cond) const\fC [virtual]\fP, \fC [noexcept]\fP"

.PP
Test whether \fCcond\fP corresponds to \fCi\fP for this category\&. 
.SS "\fBvirtual\fP const char * std::error_category::name () const\fC [pure virtual]\fP, \fC [noexcept]\fP"

.PP
A string that identifies the error category\&. 
.SS "bool std::error_category::operator< (const \fBerror_category\fP & __other) const\fC [inline]\fP, \fC [noexcept]\fP"

.PP
Ordered comparison that defines a total order for error categories\&. 
.SS "bool std::error_category::operator== (const \fBerror_category\fP & __other) const\fC [inline]\fP, \fC [noexcept]\fP"

.PP
An error_category only compares equal to itself\&. 

.SH "Author"
.PP 
Generated automatically by Doxygen for libstdc++ from the source code\&.