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

[syserr.errcondition.observers]

22 Diagnostics library [diagnostics] 22.5 System error support [syserr] 22.5.4 Class error_­condition [syserr.errcondition] 22.5.4.4 Class error_­condition observers [syserr.errcondition.observers]

int value() const noexcept;

1 #

Returns: val_­.

const error_category& category() const noexcept;

2 #

Returns: *cat_­.

string message() const;

3 #

Returns: category().message(value()).

explicit operator bool() const noexcept;

4 #

Returns: value() != 0.

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