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

std::error_code::operator= - cppreference.com

template< class ErrorCodeEnum > error_code& operator=( ErrorCodeEnum e ) noexcept;

(1) (since C++11)

error_code& operator=( const error_code& other ) = default;

(2) (since C++11)
(implicitly declared)

error_code& operator=( error_code&& other ) = default;

(3) (since C++11)
(implicitly declared) 1)

Replaces the error code and corresponding category with those representing error code enum

e

Equivalent to *this = make_error_code(e), where make_error_code is only found by argument-dependent lookup.

This overload participates in overload resolution only if

std::is_error_code_enum<ErrorCodeEnum>::value

true

2,3) Implicitly defined copy-assignment operator and move-assignment operator assign the contents of other to *this.

[edit] Parameters e - error code enum to construct other - another error code to assign with [edit] Return value

*this

[edit] Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR Applied to Behavior as published Correct behavior LWG 3629 C++11 only std::make_error_code overloads were used ADL-found overloads are used [edit] See also assigns another error code
(public member function) [edit]

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