std::error_code::operator bool

explicit operator bool() const noexcept;

Checks if the error value is valid, i.e. non-zero.

Parameters

(none).

Return value

false if value() == 0, true otherwise.

Notes

Although this operator is often used as a convenient shorthand to check if any error was returned (as in if (ec) { /* handle error */ }, such use is not robust: some error codes, for example, HTTP status code 200, may indicate success as well.