[previous] 4571 [next] The left-hand operand of this << operator has an 'essential type' which is narrower than type 'int'.
Arithmetic type - Operands

This message is issued whenever an expression of essential type narrower than int appears on the left hand side of the << operator.

For example: 


/*PRQA S 1-9999 ++*/
/*PRQA S 4571 --*/

unsigned char f4571 (unsigned char a)
{
  return a << 1;            /* 4571 */
}

For the purposes of QA·C conversion messages, types are ordered according to the configured size (-s option), by default; hence for a typical 32 bit configuration, types int and long will be considered equivalent. However, when the -strictrank option is specified, types will be ordered according to their rank; consequently int will be considered narrower than long.

QA·C Source Code Analyser 8.1.2
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