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Showing content from https://timsong-cpp.github.io/cppwp/n4140/syserr.errcode.constructors below:

[syserr.errcode.constructors]

19.5.2.2 Class error_code constructors [syserr.errcode.constructors]

error_code() noexcept;

Effects: Constructs an object of type error_code.

Postconditions: val_ == 0 and cat_ == &system_category().

error_code(int val, const error_category& cat) noexcept;

Effects: Constructs an object of type error_code.

Postconditions: val_ == val and cat_ == &cat.

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

Effects: Constructs an object of type error_code.

Postconditions: *this == make_error_code(e).

Remarks: This constructor shall not participate in overload resolution unless is_error_code_enum<ErrorCodeEnum>::value is true.


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