MESSAGE
| DATE | 2011-03-15 |
| FROM | Ruben Safir
|
| SUBJECT | Subject: [NYLXS - HANGOUT] [ruben@mrbrklyn.com: Re: this compared to NULL]
|
----- Forwarded message from Ruben Safir -----
Date: Tue, 15 Mar 2011 15:44:02 -0400
From: Ruben Safir
To: Billy
Cc: Ruben Safir
Subject: Re: this compared to NULL
User-Agent: Mutt/1.5.20 (2009-06-14)
On Tue, Mar 15, 2011 at 01:06:56PM -0400, Billy wrote:
> You're trying to return NULL from a method that returns MESSAGE.
>
> That's not going to work.
> It has nothing to do with the comparison: this==NULL
> This would be clear if you used newlines in your code.
>
> There's no great advantage to squishing a method onto one line,
> and it makes diagnostics harder to pinpoint.
>
Yeah - I debugged it to that problem by doing exactly as you said and
breaking it up on multiple lines. But now I'm perplexed as to the best
solution.
I think that this is best fixed using a cast in the LIST object and then
I need to add a constructor for an integer for MESSAGES.
I was going to see how the strings library does this and maybe emulate
that.
There is another puzzle that is bothering me. I had a bug that the
compiler didn't pick up and I don't know why.
The method value originally ended with a semicolon, which is something
only a class should do, and nothing complained and everything initially
worked (I initially just yanked the declaration from the Class and
forgot to remove the semicolon). I believe that becuse it is a template
class that this error wasn't picked up, bt I'm not certain how this
affected the original code.
Ruben
>
> On Tue, Mar 15, 2011 at 2:17 AM, Ruben Safir wrote:
> > I just realized you don't have the MYSQL setup, but here is the compiler
> > output
> >
> > || g++ ? -Wall -ggdb -I/usr/local/include/mysql
> > -I/usr/local/include/mysql++ -c linklist.cpp
> > || g++ ?-Wall -ggdb -I/usr/local/include/mysql
> > -I/usr/local/include/mysql++ -c linklist_main.cpp
> > || In file included from linklist_main.cpp:1:
> > || linklist.h: In member function ?unk CHAINLIST::NODE::value()
> > [with unk = MESSAGE]?:
> > linklist.h|154| instantiated from ?void
> > CHAINLIST::LIST::display(std::ostream&) [with unk = MESSAGE]?
> > linklist_main.cpp|312| instantiated from here
> > linklist.h|43| error: conversion from ?int? to non-scalar type ?MESSAGE?
> > requested
> > || make: *** [linklist_main.o] Error 1
> >
> >
> > On Tue, Mar 15, 2011 at 01:59:08AM -0400, Ruben Safir wrote:
> >> Try to compile this. ?It seems to be telling me that I can't compare
> >> this to NULL which it has done just fine with the string<> library
> >> and otherwise.
> >>
> >> I'm at a loss to the problem.
> >>
> >> Ruben
> >> --
> >> http://www.mrbrklyn.com - Interesting Stuff
> >> http://www.nylxs.com - Leadership Development in Free Software
> >>
> >> So many immigrant groups have swept through our town that Brooklyn, like Atlantis, reaches mythological proportions in the mind of the world ?- RI Safir 1998
> >>
> >> http://fairuse.nylxs.com ?DRM is THEFT - We are the STAKEHOLDERS - RI Safir 2002
> >>
> >> "Yeah - I write Free Software...so SUE ME"
> >>
> >> "The tremendous problem we face is that we are becoming sharecroppers to our own cultural heritage -- we need the ability to participate in our own society."
> >>
> >> "> I'm an engineer. I choose the best tool for the job, politics be damned.<
> >> You must be a stupid engineer then, because politcs and technology have been attached at the hip since the 1st dynasty in Ancient Egypt. ?I guess you missed that one."
> >>
> >> ? Copyright for the Digital Millennium
> >
> >
> >
> > --
> > http://www.mrbrklyn.com - Interesting Stuff
> > http://www.nylxs.com - Leadership Development in Free Software
> >
> > So many immigrant groups have swept through our town that Brooklyn, like Atlantis, reaches mythological proportions in the mind of the world ?- RI Safir 1998
> >
> > http://fairuse.nylxs.com ?DRM is THEFT - We are the STAKEHOLDERS - RI Safir 2002
> >
> > "Yeah - I write Free Software...so SUE ME"
> >
> > "The tremendous problem we face is that we are becoming sharecroppers to our own cultural heritage -- we need the ability to participate in our own society."
> >
> > "> I'm an engineer. I choose the best tool for the job, politics be damned.<
> > You must be a stupid engineer then, because politcs and technology have been attached at the hip since the 1st dynasty in Ancient Egypt. ?I guess you missed that one."
> >
> > ? Copyright for the Digital Millennium
> >
>
>
>
> --
> ?n??uop ?ll?q
--
http://www.mrbrklyn.com - Interesting Stuff
http://www.nylxs.com - Leadership Development in Free Software
So many immigrant groups have swept through our town that Brooklyn, like Atlantis, reaches mythological proportions in the mind of the world - RI Safir 1998
http://fairuse.nylxs.com DRM is THEFT - We are the STAKEHOLDERS - RI Safir 2002
"Yeah - I write Free Software...so SUE ME"
"The tremendous problem we face is that we are becoming sharecroppers to our own cultural heritage -- we need the ability to participate in our own society."
"> I'm an engineer. I choose the best tool for the job, politics be damned.<
You must be a stupid engineer then, because politcs and technology have been attached at the hip since the 1st dynasty in Ancient Egypt. I guess you missed that one."
? Copyright for the Digital Millennium
----- End forwarded message -----
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