&{predicate} and !{predicate} operators

[marco.v...@gmail.com]

Hi,

I fail to understand how to use them. Here is what I have:

// ---------------
{
myPred = function() {
return true;
}
}

start = r

r = &{myPred} "bla"
// ---------------

This is not parsing the text "bla". Why?

Thanks!
Marco

[David Majda]

Hi,

2013/2/9 <marco.v...@gmail.com>:

Because you're not calling the function, you just mention its name.
The proper way is:

&{ return myPred(); }

You can also specify the condition directly in the predicate (which is
usually better, unless it is complicated and/or used at multiple
places).

--
David Majda
Entropy fighter
http://majda.cz/