Pointers and debugging in golang

Question

I'm stuck in a situation and cannot figure out what I messed up. Easiest way to explain is probably some minimal example: http://play.golang.org/p/14lbOBsCCo

I am tying to modify a value of a struct via its pointer but end up modifing some memory other the part I want. Line 92 is where my issue is.

How would you debug a situation like this (tools etc.), and how do I get the broker.Port set?

Thanks for hints/suggestions!

Mr_Pink · Accepted Answer · 2014-07-15 16:10:11Z

6

You're not using pointers throughout. Start off with a Registry of type:

type Registry []*Broker

and work from there

Working example

As far as debugging tricks, this was my process:

Value isn't being changed, so something is being copied by value
Notice that Registry is type []Broker, but we want to modify Brokers, so it needs to be a pointer
Change type Registry to []*Broker
Keep attempting to compile, letting the compiler tell me every place we are using a value where we need a pointer (woohoo fast compile times and static typing)

edited Jul 15, 2014 at 16:10

answered Jul 15, 2014 at 15:44

Mr_Pink

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2 Comments

sontags Over a year ago

That's it! Your answer is almost as demeaning as "let me google this for you" :) Thanks!

Mr_Pink Over a year ago

I added a little more info, but sometimes it's the simple things ;)

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