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Showing content from https://cplusplus.com/reference/system_error/error_condition/operator=/ below:

public member function

<system_error>

std::error_condition::operator= 
template <class ErrorConditionEnum>  error_condition& operator= (ErrorConditionEnum e) noexcept;

Assign error condition

Calls make_error_condition to construct an error condition from e, whose value is assigned to the error_condition object.

This function only participates in overload resolution if is_error_condition_enum<ErrorConditionEnum>::value is true. Which is the case when errc is used as the ErrorConditionEnum type.

Member function assign can be used to assign a new value to the error_condition object using an integer value and a category, instead of an enum value.



Parameters
e
Error condition enum value of an enum type for which is_error_condition_enum has a value member with a value of true.
If this is a value of type errc, the object is set to the appropriate error condition value of the generic_category.

Return value*this
See also
errc
Generic error conditions (enum class)
error_condition::error_condition
Construct error_condition (public member function)
error_condition::assign
Assign error condition (public member function)
error_condition::clear
Clear error condition (public member function)

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