LLSD value = LLSD::Undefined(); if (value.isUndefined()) { // do something with the undefined value }
LLSD values = LLSD::Array(); values.append(123); values.append(LLSD::Undefined()); values.append("hello"); if (values[1].isUndefined()) { // do something with the undefined element }This code creates an array with three elements: an integer, an undefined value, and a string. It then accesses the second element using the [] operator and checks whether it is undefined using the isUndefined() function. Based on the LLSD package library mentioned in the question, it can be determined that LLSD is a part of the Second Life virtual world software development kit.