[mercury-users] need help: Mercury+C

[Peter Ross]

On 02-Sep-1998, Tyson Dowd <trd at cs.mu.OZ.AU> wrote:
> On 01-Sep-1998, tcklnbrg <at at ingenuity-sw.com> wrote:
> 
> > 
> > The tokenize(..) c code in lexer.c does open and "read-only" a file.  
> > Does this mean that the Mercury function that corresponds to c
> > tokenize(..)
> > in file lexer.c, must be declared with the 2 extra io__state args?  
> 
> Maybe.  You will need to have some sort of state arguments to represent
> the state of the lexer, so io__state is a good choice to start with.
> 
You should have a pair of arguments which are (di, uo) and that
represent the "state of the world".  These are needed to ensure that the
code is never backtracked over.

Pete.