[mercury-users] Debug messages

[Peter Ross]

Elmar Haneke wrote:

> Hi,
>
> how can I make my program output some trace-data without using the 
> io_state?
>
> For debugging pruposes it is very much more convenient to place an 
> 'print("Was here")' to some code where no IO-state is passed or IO is 
> not possible due to backtracking..
>
I've written a module which does log4j style logging in Mercury.

See 
http://www.cs.mu.oz.au/research/mercury/mailing-lists/mercury-users/mercury-users.200501/0014.html 


I've also included two predicates which can be used without the io.state.
    impure_log_f
    unsafe_log_f
which can be used in contexts where the io.state is unavailable.

The nice thing about this interface is that one can easily 
enable/disable logging in discrete parts of code.
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