operator==,!=,<(std::error_condition)

 

C++

Language

Headers

Freestanding and hosted implementations

Named requirements

Language support library

Concepts library (C++20)

Diagnostics library

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)

Filesystem library (C++17)

Technical Specifications

 

Utilities library

Type support (basic types, RTTI, type traits)
Dynamic memory management
Error handling
Program utilities
Variadic functions
Library feature-test macros
Date and time
Function objects
initializer_list (C++11)
bitset
hash (C++11)
integer_sequence (C++14)
Relational operators (deprecated)
rel_ops::operator!=rel_ops::operator>rel_ops::operator<=rel_ops::operator>=
Comparisons (C++20)
strong_order weak_order partial_order strong_equal weak_equal	strong_ordering weak_ordering partial_ordering strong_equality weak_equality	is_eqis_neqis_ltis_lteqis_gtis_gteq
common_comparison_category
Common vocabulary types
pair tuple (C++11) apply (C++17) make_from_tuple (C++17)	optional (C++17) any (C++17) variant (C++17)
Swap, forward and move
swap
exchange (C++14)
forward (C++11)
move (C++11)
move_if_noexcept (C++11)
Elementary string conversions
to_chars (C++17)
from_chars (C++17)
chars_format (C++17)
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 handling failures terminate terminate_handler get_terminate (C++11) set_terminate bad_exception unexpected (until C++17) unexpected_handler (until C++17) get_unexpected (C++11)(until C++17) set_unexpected (until C++17) Contracts contract_violation (C++20)

Exception categories logic_error invalid_argument domain_error length_error out_of_range runtime_error range_error overflow_error underflow_error tx_exception (TM TS) 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_condition

Member functions

error_condition::error_condition

error_condition::operator=

error_condition::assign

error_condition::clear

error_condition::value

error_condition::category

error_condition::message

error_condition::operator bool

Non-member functions

operator==operator!=operator<

Helper classes

is_error_condition_enum

hash<std::error_condition>

 

Defined in header <system_error>
bool operator==( const error_condition& lhs, const error_condition& rhs ) noexcept;	(1)	(since C++11)
bool operator!=( const error_condition& lhs, const error_condition& rhs ) noexcept;	(2)	(since C++11)
bool operator<( const error_condition& lhs, const error_condition& rhs ) noexcept;	(3)	(since C++11)
bool operator==( const error_code& code, const error_condition& cond ) noexcept;	(4)	(since C++11)
bool operator==( const error_condition& cond, const error_code& code ) noexcept;	(4)	(since C++11)
bool operator!=( const error_code& code, const error_condition& cond ) noexcept;	(5)	(since C++11)
bool operator!=( const error_condition& cond, const error_code& code ) noexcept;	(5)	(since C++11)

Compares two error conditions.

1) Checks whether lhs and rhs are equal.

2) Checks whether lhs and rhs are not equal.

3) Checks whether lhs is less than rhs.

4) Checks whether code is a semantic match for cond.

5) Checks whether code is not a semantic match for cond.

Parameters

lhs, rhs

-

error conditions to compare

Return value

1) true if the error category and error value compare equal.

2) true if the error category or error value compare are not equal.

3) true if lhs.category() < rhs.category(). Otherwise, true if lhs.category() == rhs.category() && lhs.value() < rhs.value(). Otherwise, false.

4) true if either code.category().equivalent(code.value(), cond) or cond.category().equivalent(code, cond.value()).

5) true if neither code.category().equivalent(code.value(), cond) nor cond.category().equivalent(code, cond.value()).

See also

equivalent [virtual]	compares error_code and error_condition for equivalence (virtual public member function of std::error_category)
operator==operator!=operator<	compares two error_codes (function)