Debugging STL collections
I have a question about debugging STL collections. If I have an old-fashioned array of ints, I can view the entire array in the watch window. I am wondering if there is any way to do that with an STL collections. Take a look at this code:
{code}
std::vector<int> myvec;
int i;
for (i=0; i < 10; i++) {
myvec.insert(myvec.end(), i);
}
int j = myvec[3] ;
int myarr[10];
for (i=0; i < 10; i++) {
myarr[i] = i;
}
int k = myvec[3] ;
{code}
In the debugger Watch window, I can check "Allow side effects and function calls", and I can look at the value of an individual member of the vector or the array using [] notation like this:
{code}
myvec[7]
myarr[7]
{code}
For the Array, I can just use this syntax and it will show me the entire contents of all of the entries of the array, but that does not work for the vector. Is there any way to do that? I am currently using C++ Builder XE, but will be upgrading to XE8 very soon.
{code}
myvec
myarr
{code}
Thanks in advance for your help
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Mary
7/22/2015 7:22:17 PM
embarcadero.cppbuilder.ide
2180 articles. 
1 followers.
8 Replies
396 Views
Mary wrote: > I have a question about debugging STL collections. If I have an > old-fashioned array of ints, I can view the entire array in the watch > window. I am wondering if there is any way to do that with an STL > collections. Yes, there is, however it is not trivial to implement. You have to write a custom Debug Visualizer (or find a third-party implementation) for each individual STL collection that you are interested in viewing: Debugger Visualizers http://docwiki.embarcadero.com/RADStudio/XE/en/Debugger_Visualizers The IDE ships with source code for several example visualizers in the "$(BDS)\source\Visualizers" folder. There is an example visualizer provided that handles std::string and std::wstring. Obviously, a std::vector visualizer would be more complex to implement, but doable. -- Remy Lebeau (TeamB)
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Remy
7/22/2015 7:48:10 PM
Remy, Is there a white paper or a little more documentation on how to do it, beyond the sample code? Or could you recommend a third party vendor that has created STL debug visualizers? Thanks Mary
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Mary
7/22/2015 8:12:01 PM
Mary wrote: > Is there a white paper or a little more documentation on how to > do it, beyond the sample code? Not that I know of. However, there have been some prior forum discussions. For instance, there is some information available here (the primary topic was about writing an AnsiString visualizer, but there is some vector-related info as well): http://bcbjournal.com/forums/viewtopic.php?f=10&t=1074 > Or could you recommend a third party vendor that has created > STL debug visualizers? I am not aware of any. -- Remy Lebeau (TeamB)
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Remy
7/22/2015 9:02:25 PM
Hi Remy, I took a look at the link you posted: http://bcbjournal.com/forums/viewtopic.php?f=10&t=1074 There is a reference to another post where you posted some sample code, but unfortunately it is a dead link: https://forums.embarcadero.com/thread.jspa?messageID=278312&tstart=0 I don't suppose that source still exists somewhere? Thanks! Mary
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Mary
7/23/2015 3:09:50 PM
<Mary McCartney> wrote in message news:728660@forums.embarcadero.com... > Hi Remy, > > I took a look at the link you posted: > > http://bcbjournal.com/forums/viewtopic.php?f=10&t=1074 > > There is a reference to another post where you posted some sample code, > but unfortunately it is a dead link: > https://forums.embarcadero.com/thread.jspa?messageID=278312&tstart=0 > > I don't suppose that source still exists somewhere? Don't know about original, but might check this: http://codenewsfast.com/cnf/article/1160497240/permalink.art-ng1882q4801 and in that is this reference: http://mb.audacia-software.de/pfiles/MoreVisualizers.zip And in the bcbjournal thread, You didn't read carefully/far enough... Further down in that bcbjournal thread is code that is probably derived from the thread you can't reach - and below that code are Remy's comments on what else he did before he had it functioning correctly. You might be able to also find the original on codenewsfast.com, but a little hard without enough known keywords...
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david
7/23/2015 4:45:20 PM
Mary McCartney wrote: > For the Array, I can just use this syntax and it will show me the > entire contents of all of the entries of the array, but that does not > work for the vector. Is there any way to do that? SomeVec._Myfirst is pointer on data buffer. You can use "*(SomeVec._Myfirst)" and appropriate "Repeat count" to see contents of the buffer. BTW, since C++11 SomeVec.data() also should work (i.e. in 64 bit debugger). > I can look at the value of an individual member of the vector or > the array using [] notation Good to know that this works: in CB2007 such watch usually hangs up IDE after second evaluation. :( I have my own IDE debugging expert for RAD2007 which allows to see arrays as plots at breakpoint (I never tried it in later versions). I can send its sources (in Pascal) if you have an interest. The only "problems" that it uses 1) standard db components (not available in Studio by default now) and 2) some minor controls from (free) JCL/JCVL library. -- Alex
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Alex
7/24/2015 5:11:43 AM
> {quote:title=Alex Belo wrote:}{quote}
> I have my own IDE debugging expert for RAD2007 which allows to see
> arrays as plots at breakpoint (I never tried it in later versions). I
> can send its sources (in Pascal) if you have an interest. The only
> "problems" that it uses
> 1) standard db components (not available in Studio by default now) and
> 2) some minor controls from (free) JCL/JCVL library.
>
> --
> Alex
Thanks for the offer Alex - that is very generous! But I don't think it would help me. I really needs C++ samples.
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Mary
7/29/2015 1:05:50 PM
> {quote:title=Remy Lebeau (TeamB) wrote:}{quote}
> Mary wrote:
>
> > Is there a white paper or a little more documentation on how to
> > do it, beyond the sample code?
>
> Not that I know of. However, there have been some prior forum discussions.
> For instance, there is some information available here (the primary topic
> was about writing an AnsiString visualizer, but there is some vector-related
> info as well):
>
> http://bcbjournal.com/forums/viewtopic.php?f=10&t=1074
>
> > Or could you recommend a third party vendor that has created
> > STL debug visualizers?
>
> I am not aware of any.
>
> --
> Remy Lebeau (TeamB)
Thanks Remy. I am getting a little sidetracked at work and won't be able to work on this for a while, but I wanted to thank you for pointing me in the right direction. You rock!
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Mary
7/29/2015 1:15:14 PM
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