[mercury-users] io output exceptions

[Ralph Becket]

Michael Day, Thursday, 14 November 2002:
> 
> In that case, why don't input operations throw exceptions?

We may well revisit this decision for version 2 of the library.

> Ralph says:
> 
> "One expects a result from an input and has to be prepared for at least
> success and eof, so also handling error cases that way seems natural."
> 
> but it does complicate parsing code as you end up with three branches 
> after every operation instead of two.

You can always put your own wrapper around the IO operations that
only has two possible outcomes (bar an exception).

Of course, if the files you're working with are small enough (i.e. these
days they can be quite substantial), you may be able to just read the
whole thing in as a string and work with that.

- Ralph
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