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

std::error_code::error_code - cppreference.com

error_code() noexcept;

(1) (since C++11)

error_code( int ec, const error_category& ecat ) noexcept;

(2) (since C++11)

template< class ErrorCodeEnum > error_code( ErrorCodeEnum e ) noexcept;

(3) (since C++11)

error_code( const error_code& other ) = default;

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

error_code( error_code&& other ) = default;

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

Constructs new error code.

2)

Constructs error code with

ec

as the platform-dependent error code and

ecat

as the corresponding

error category

3)

Constructs error code from an error code enum

e

. Equivalent to

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

4,5) Implicitly defined copy constructor and move constructor. Initializes the error code with the contents of the other.

[edit] Parameters other - another error code to initialize with ec - platform dependent error code to construct with ecat - error category corresponding to ec e - error code enum to construct with [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

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