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Showing content from https://cplusplus.com/reference/system_error/error_code/ below:

class

<system_error>

std::error_code

Error code

Objects of this type hold an error code value associated with a category.

The operating system and other low-level applications and libraries generate numerical error codes to represent possible results. These numerical values may carry essential information for a specific platform, but be non-portable from one platform to another.

Objects of this class associate such numerical codes to error categories, so that they can be interpreted when needed as more abstract (and portable) error conditions.

Member functions

(constructor): Construct error_code (public member function)

assign: Assign error code (public member function)

operator=: Assign error code (public member function)

clear: Clear error code (public member function)

value: Error value (public member function)

category: Get category (public member function)

default_error_condition: Default error condition (public member function)

message: Get message (public member function)

operator bool: Convert to bool (public member function)

Non-member function overloads

relational operators (error_code): Relational operators (function)

operator<<: Insert into ostream (function)

Non-member class specializations

hash<error_code>: Hash for error_code (class template specialization)

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