std::error_code::category - cppreference.com (original) (raw)

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Utilities library

Language support Type support (basic types, RTTI) Library feature-test macros (C++20) Program utilities Variadic functions initializer_list(C++11) is_constant_evaluated(C++20) is_within_lifetime(C++26) source_location(C++20) Coroutine support (C++20) Contract support (C++26) 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 Function objects Bit manipulation (C++20) C-style bit manipulation (C++26) 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)

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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)

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std::error_code

Member functions
error_code::error_code
error_code::operator=
error_code::assign
Modifiers
error_code::clear
Observers
error_code::value
error_code::category
error_code::default_error_condition
error_code::message
error_code::operator bool
Non-member functions
operator==operator!=operator<operator<=>(until C++20)(until C++20)(C++20)
operator<<
Helper classes
is_error_code_enum
hash std::error\_code

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| const std::error_category& category() const noexcept; | | (since C++11) | | ---------------------------------------------------------------------------------- | | ------------- |

Returns the error category of the error code.

[edit] Parameters

(none)

[edit] Return value

The error category of the error code.

[edit] See also

value	obtains the value of the error_code (public member function) [edit]

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