MPE/iX - CI Programming for Stability

July 18, 2008 HP World '01 70
• evaluated during the execution of the command -- later than explicit
referencing
• makes for more readable scripts
• variable type is preserved -- no need for quotes, like: “!varname”
• only 5 commands accept implicit referencing: CALC, ELSEIF, IF,
SETVAR, WHILE -- all others require explicit referencing
• all CI function parameters accept implicit referencing
• variables inside ![expression] may be implicitly referenced
• performance differences:
• “!HPUSER.!HPACCOUNT” = “OP.SYS” 4340 msec
• HPUSER + “.” + HPACCOUNT = “OP.SYS” 4370 msec
• HPUSER = “OP” and HPACCOUNT = “SYS” 4455 msec*
(*with user match true)
I prefer the last choice since many times :IF will not need to evaluate the
expression after the AND
Implicit referencing -
just varname