VisiblePosition pos = ...; // create a VisiblePosition object if (pos.isNull()) { // handle the case where the position is null } else { // handle the case where the position is not null }
VisiblePosition pos = ...; // create a VisiblePosition object if (!pos.isNull()) { // do something with the position, since it is not null }
VisiblePosition pos = ...; // create a VisiblePosition object if (pos.isNull()) { // do nothing, since the position is null return; } // continue processing the position, since it is not nullIn all of these examples, the isNull function is used to check if the position is null or not, and the code behaves differently depending on the result of this check. Overall, the VisiblePosition class is a part of the WebCore library which provides functionality for working with the DOM tree in web applications, and the isNull function is a useful tool for checking if a position is null or not.