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Showing content from https://en.cppreference.com/w/cpp/language/../error/error_code.html below:

std::error_code - cppreference.com

class error_code;

(since C++11)

std::error_code represents a platform-dependent error code value. Each std::error_code object holds an error code value originating from the operating system or some low-level interface and a pointer to an object of type std::error_category, which corresponds to the said interface. The error code values are not required to be unique across different error categories.

[edit] Member functions constructs an error code
(public member function) [edit] assigns another error code
(public member function) [edit] assigns another error code
(public member function) [edit] Modifiers sets the error_code to value ​0​ in system_category
(public member function) [edit] Observers obtains the value of the error_code
(public member function) [edit] obtains the error_category for this error_code
(public member function) [edit] obtains the error_condition for this error_code
(public member function) [edit] obtains the explanatory string for this error_code
(public member function) [edit] checks if the value is non-zero
(public member function) [edit] [edit] Non-member functions [edit] Helper classes [edit] See also

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