[mercury-users] functions in DCGs

[Dave Slutzkin]

Hi all.

Is it impossible (or at least annoying) to use
functions in DCGs?

For example, to access the result of a function you
need to use 'L = some_function'.  But there is no such
thing as '='/4, so you need to enclose this in braces:
  { L = some_function }

But then some_function doesn't have access to the DCG
arguments it needs and so you need to state them
explicitly - destroying any DCG advantage.

The easiest solution I can think of is to write '='/4
and just copy the DCG argument.

Do DCGs and functions just not mix?

thanks,

Dave.

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