Get the previous element of a list.

Reference pointer for the next call to XPRMgetnextlistelt.

This function is used to enumerate elements of a list in reverse order. The second parameter is used to store the current location in the list; if this parameter is NULL, the last element of the list is returned. This function returns NULL if it is called with the reference to the first element. Otherwise, the returned value can be used as the input parameter ref to get the following element and so on. The function returns in the third argument the type of the object stored in value: this correspond to the value returned by XPRMgetlisttype if all elements have the same type.

XPRMgetlisttype, XPRMgetnextlistelt.