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TTworkbench: how to tell if a variable is initialised (not omit) in TTCN-3?

you can use the pre-defined function isbound() like below.

var charstring v_c1;
var charstring v_c2 := "";
var charstring v_c3 := "a string";

isbound(v_c1) // return false
isbound(v_c2) // return true
isbound(v_c3) // return true
 

Product : TTworkbench