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

 

C++

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Freestanding and hosted

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Standard library headers

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Feature test macros (C++20)

Language support library

Concepts library (C++20)

Metaprogramming library (C++11)

Diagnostics library

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Ranges library (C++20)

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Technical specifications

Symbols index

External libraries

 

Utilities library

Language support Type support (basic types, RTTI) Library feature-test macros (C++20) Dynamic memory management Program utilities Coroutine support (C++20) Variadic functions is_constant_evaluated (C++20) is_within_lifetime (C++26) initializer_list (C++11) source_location (C++20) Three-way comparison three_way_comparablethree_way_comparable_with (C++20)(C++20) strong_ordering (C++20) weak_ordering (C++20) partial_ordering (C++20) common_comparison_category (C++20) compare_three_way_result (C++20) compare_three_way (C++20) strong_order (C++20) weak_order (C++20) partial_order (C++20) compare_strong_order_fallback (C++20) compare_weak_order_fallback (C++20) compare_partial_order_fallback (C++20)   is_eqis_ltis_lteq (C++20)(C++20)(C++20)   is_neqis_gtis_gteq (C++20)(C++20)(C++20)

General utilities Date and time Function objects Formatting library (C++20)   bitset hash (C++11) Relational operators (deprecated in C++20) rel_ops::operator!=rel_ops::operator>    rel_ops::operator<=rel_ops::operator>= Integer comparison functions cmp_equalcmp_lesscmp_less_than (C++20)(C++20)(C++20)   cmp_not_equalcmp_greatercmp_greater_than (C++20)(C++20)(C++20) in_range (C++20) Swap and type operations swap ranges::swap (C++20) exchange (C++14) declval (C++11) to_underlying (C++23) forward (C++11) forward_like (C++23) move (C++11) move_if_noexcept (C++11) as_const (C++17) Common vocabulary types pair tuple (C++11) optional (C++17) any (C++17) variant (C++17) tuple_size (C++11) tuple_element (C++11) apply (C++17) make_from_tuple (C++17) expected (C++23) Elementary string conversions to_chars (C++17) from_chars (C++17) chars_format (C++17) to_chars_result (C++17) from_chars_result (C++17)

 

Diagnostics library

Exception handling exception uncaught_exceptionuncaught_exceptions (until C++20*)  (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 (until C++17*) set_unexpected (until C++17*) Error numbers Error codes errno Assertions assert

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) System error 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) Stacktrace stacktrace_entry (C++23) basic_stacktrace (C++23) Debugging support is_debugger_present (C++26) breakpoint_if_debugging (C++26) breakpoint (C++26)

 

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<operator<=> (until C++20)(until C++20)(C++20)

Helper classes

is_error_condition_enum

hash<std::error_condition>

 

Defined in header <system_error>
bool operator==( const std::error_condition& lhs,                  const std::error_condition& rhs ) noexcept;	(1)	(since C++11)
bool operator!=( const std::error_condition& lhs,                  const std::error_condition& rhs ) noexcept;	(2)	(since C++11) (until C++20)
bool operator<( const std::error_condition& lhs,                 const std::error_condition& rhs ) noexcept;	(3)	(since C++11) (until C++20)
std::strong_ordering operator<=>( const std::error_condition& lhs,                                   const std::error_condition& rhs ) noexcept;	(4)	(since C++20)
bool operator==( const std::error_code& code,                  const std::error_condition& cond ) noexcept;	(5)	(since C++11)
bool operator==( const std::error_condition& cond,                  const std::error_code& code ) noexcept;	(5)	(since C++11) (until C++20)
bool operator!=( const std::error_code& code,                  const std::error_condition& cond ) noexcept;	(6)	(since C++11) (until C++20)
bool operator!=( const std::error_condition& cond,                  const std::error_code& code ) noexcept;	(6)	(since C++11) (until C++20)

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) Obtains three-way comparison result of lhs and rhs.

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

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

The <, <=, >, >=, and != operators are synthesized from operator<=> and operator== respectively.

(since C++20)

Parameters

lhs, rhs, cond	-	error conditions to compare
code	-	the error code 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) lhs.category() <=> rhs.category() if it is not std::strong_ordering::equal. Otherwise, lhs.value() <=> rhs.value().

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

6) 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<operator<=> (removed in C++20)(removed in C++20)(C++20)	compares two error_codes (function)