[erlang-questions] Questions on match specifications
Sat Nov 12 03:21:44 CET 2011
Thanks. That clear things up some. But I'm not sure about this one:
On Nov 11, 6:44 am, Magnus Henoch <>
> > 1. Quoting seems incosistent. Why is 'and' quoted but andalso is not?
> Probably a typo. Both need to be quoted, otherwise you get a syntax
In the MatchConditions and MatchBody, aren't all the terms passed as
Here are all the functions listed as allowed for ETS matches:
abs is_atom is_record '=:=' 'and'
element is_binary is_reference '=/=' 'or'
hd is_constant is_seq_trace '==' 'not'
length is_float is_tuple '/=' 'xor'
node is_function '+' '<' 'band'
round is_integer '-' '=<' 'bor'
size is_list '*' '>' 'bnot'
tl is_number 'div' '>=' 'bxor'
trunc is_pid 'rem' andalso 'bsl'
self is_port orelse 'bsr'
According to the Erlang rules for atoms, "An atom should be enclosed
in single quotes (') if it does not begin with a lower-case letter or
if it contains other characters than alphanumeric characters,
underscore (_), or @", so only the non-alphanumeric operators should
need quoting. Why do the arithmetic and logical operators need to be
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