19 Diagnostics library [diagnostics]

19.5 System error support [syserr]

19.5.4 Class error_code [syserr.errcode]

19.5.4.2 Constructors [syserr.errcode.constructors]

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error_code() noexcept;
1
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Effects: Initializes val_ with 0 and cat_ with &system_category().
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error_code(int val, const error_category& cat) noexcept;
2
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Effects: Initializes val_ with val and cat_ with &cat.
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template<class ErrorCodeEnum> error_code(ErrorCodeEnum e) noexcept;
3
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Constraints: is_error_code_enum_v<ErrorCodeEnum> is true.
4
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Effects: Equivalent to: error_code ec = make_error_code(e); assign(ec.value(), ec.category());