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Showing content from https://timsong-cpp.github.io/cppwp/n4659/syserr.errcode.constructors below:

[syserr.errcode.constructors]

22 Diagnostics library [diagnostics] 22.5 System error support [syserr] 22.5.3 Class error_­code [syserr.errcode] 22.5.3.2 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_­v<ErrorCodeEnum> is true.


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