iDevOS CALC "EXISTS" Command

See if an entity exists (immediate name).

Description

CALC( y, name, "EXISTS" );   // y = exists("name") = does entity name exist?

This command checks to see if the given entity called name exists, ie has been created. The value y will be set to 1 if the entity exists or 0 if it does not.

A test for the existence of an entity whose name is provided in a text variable can also be tested using "VEXISTS".

Parameters

y

Calculation result.
Parameter type: entity name of a numeric variable (eg U8, S32, FLT3 etc).

name

Entity Name.
Parameter type: immediate entity name.

"EXISTS"

CALC command operator.
Parameter type: immediate string.

Examples

Example 1

VAR(res, 0,  U8);  // Result

// Assume the entity test has not been created.
CALC(res, test, "EXISTS"); // res = 0

// Create the entity test.
VAR(test, 99,  U8);
CALC(res, test, "EXISTS"); // res = 1