Beefy Boxes and Bandwidth Generously Provided by pair Networks
There's more than one way to do things

Re: Have Perl debug automatically show modified values

by Fletch (Bishop)
on Nov 19, 2021 at 07:40 UTC ( #11138936=note: print w/replies, xml ) Need Help??

in reply to Have Perl debug automatically show modified values

You're prossibly interested in watch expressions set with something along the lines of w $var which will show the old and new value whenever the watched expression changes values (and that can be an expression, not just a single variable; whenever the value of that expression is different the watch triggers). There's not much extra detail in the docs but if you search perldebug you can find this and play with a short test script:

w expr Add a global watch-expression. Whenever a watched glob +al changes the debugger will stop and display the old and + new values.

Alternately you might be interested in a conditional breakpoint which will only drop into the debugger if a supplied expression evaluates to true (unlike the typical unconditional breakpoint you get with the normal b LINE that always stops at line number LINE).

The cake is a lie.
The cake is a lie.
The cake is a lie.

Log In?

What's my password?
Create A New User
Domain Nodelet?
Node Status?
node history
Node Type: note [id://11138936]
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others drinking their drinks and smoking their pipes about the Monastery: (4)
As of 2022-05-23 20:54 GMT
Find Nodes?
    Voting Booth?
    Do you prefer to work remotely?

    Results (82 votes). Check out past polls.