Re: [ublas] debugging in MSVC 2005

Subject: Re: [ublas] debugging in MSVC 2005
From: Jesse Perla (jesseperla_at_[hidden])
Date: 2009-10-06 08:27:52

On Tue, Oct 6, 2009 at 8:07 AM, John McDonald <johnmcd_at_[hidden]> wrote:

> Hi,
> The code compiles and executes without a problem. However if I step into
> this code, and for example stop at the sixth line, and then try to
> inspect a variable I can only get limited information on its state.
> Specifically if I open an "immediate" window and try
> v(0)
> I get the following error
> CXX0059: Error: left operand is class not a function name
> If I try
> v[0]
> CXX0058: Error: overloaded operator not found
>

A few things:
1) I haven't tried to do what you are trying exactly but: Make sure you have
made the debugging extensions described at the bottom of:
http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl?Effective_UBLAS

2) Also, don't forget that ublas is using expression templates, so things
like "-v" are going to be complicated to step through.  It will generate a
strange intermediate object without actually changing the sign of anything
or executing any code.  Only when the cout << serialization begins would it
start going through the vector and doing the negation.  If you want to look
at intermediates, you should assign expressions to temporary classes of type
ublas::vector<> etc.

3) Last, I have often thought that the "debug" build doesn't necessarily
change all of the preprocessor definitions that change debugging, see the
bottom of:
http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl?Effective_UBLAS
and if there was any inlining in a build, etc. you would definetely be
confused when stepping through.