checking for unbound?
Sat Nov 20 15:18:03 CET 2010
Is there a way to test if a variable is unbound?
I thought I could do something clever like...
[E|EL] = mnesia:dirty_index_read(myTable, value, indexField),
if <E is unbound> -> do something; % nothing was returned
length(EL) > 0 -> do something; % more than 1 item was returned
<E matches pattern> -> do something; % a match was returned
true -> do something % whatever is left
But I don't see a way to make the first test.
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