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SA0010: Arrays with only one componentdl-permalink__symbolPermalink

Detects arrays with only one element

Justification: An array with one element can be replaced by a base-type variable. Access to this variable is considerably faster than access by index to the variable.

Exception: The length of an array is often determined by a constant and is a parameter for a program. Then the program can work with arrays of different lengths and does not have to be changed if the length is only 1. This kind of situation should be documented accordingly.

Importance: Low

Example

PROGRAM PLC_PRG
VAR
	aoiEmpty : ARRAY [22..22] OF INT;
	aorEmpty : ARRAY [1..1] OF REAL;
END_VAR

aoiEmpty;
aorEmpty;

--> SA0010: Vacuous array element in variable 'aoiEmpty'
--> SA0010: Vacuous array element in variable 'aorEmpty'