19 Diagnostics library [diagnostics]

19.5 System error support [syserr]

19.5.3 Class error_­code [syserr.errcode]

19.5.3.2 Constructors [syserr.errcode.constructors]

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error_code() noexcept;
1
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Postconditions: val_­ == 0 and cat_­ == &system_­category().
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error_code(int val, const error_category& cat) noexcept;
2
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Postconditions: val_­ == val and cat_­ == &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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Postconditions: *this == make_­error_­code(e).