BloombergLP::bdlde::QuotedPrintableEncoder::isError

Return true if there is no possibility of achieving an "acceptable" result, and false otherwise. Note that for an encoder, no input can cause an error; the possible errors result either from a call to the convert method after the endConvert method is called the first time, or from a call to either the convert or the endConvert methods after the endConvert method has returned successfully.