<br><font size=2 face="sans-serif">Hi,</font>
<br>
<br><font size=2 face="sans-serif">I would have three small questions regarding
what can be expressed with type specs:</font>
<br>
<br><font size=2 face="sans-serif"> -
we can define immediate constants and even ranges for integer values (ex:
'-spec f() -> 42.' or '-spec f() -> 0..42.'), but apparently
we cannot do the same for floats? Is there any particular reason for that
(besides the lack of meaning of exact comparisons for floating-point numbers),
or maybe it is a planned enhancement?</font>
<br>
<br><font size=2 face="sans-serif"> -
it is a still more minor point, but we are using a hashtable type in pure
Erlang, which is implemented as a tuple containing buckets. The number
of elements of the tuple is determined at run-time (depending on a targeted
ideal load factor, based on the expected number of elements to be stored
in the hashtable). We can define a type for bucket(), but for the hashtable
is there any way of expressing a more precise declaration than '-opaque
hashtable() :: tuple()', i.e. to tell that even if we do not know the size
of the tuple, we know it will contain bucket() instances at each position?</font>
<br>
<br><font size=2 face="sans-serif"> -
what is the recommended way of handling functions that may or may not throw
exceptions? If otherwise returning a type T, should we use T | none() or
T | no_return() as return type, or should we consider that type specs focus
on actual return types under normal circumstances, and that exceptions
are in "another dimension"? I suppose it is the latter option,
but then one could imagine that type specs for functions could be enriched
with exception specifications, for example to check whether a catch clause
has any chance of being triggered at all?</font>
<br>
<br><font size=2 face="sans-serif">Thanks in advance for any hint,</font>
<br><font size=2 face="sans-serif">Best regards,<br>
<br>
Olivier.<br>
---------------------------<br>
Olivier Boudeville<br>
<br>
EDF R&D : 1, avenue du Général de Gaulle, 92140 Clamart, France<br>
Département SINETICS, groupe ASICS (I2A), bureau B-226<br>
Office : +33 1 47 65 59 58 / Mobile : +33 6 16 83 37 22 / Fax : +33 1 47
65 27 13</font><font face="monospace"><br>
<br>
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