A list of objects with a template member shares address, why ???

[Dennis]

Hi

I have a little problem as stated above (haven't found any solution on
the www). I have a list of objects (particles) where I have a member
of a template vector (array1d from TNT). I initialise these members in
the constructor, but when I write different vector values to different
particles the values becomes the same.

I have found out that each particles vector are pointing to the same
address :o(
When I used an array instead of a template there where no problem. How
do I initialise the template vector so each particle has it's own
template vector ??

Here are some snippets of code, which might be more understandable
than my rambling:

typedef TNT::Array1D<do uble> dVector3;
//typedef double dVector3[3];
enum orient {eHoris, eVertic};

//-----------------------------
typedef struct sParticle{
dVector3 position; //position of particle
sParticle():pos ition(3)
{
}
}

list<sParticle> particlePool;
particlePool.re size(noParticle s);
for(k=0;k<emitN oParticles;k++) {
(*emit_iterator ).position[0] = k++
}

this works when i use my array vector, but when using the Array1D
vector the position vector points to the same address for all
particles.

How do I ensure that each particle has its own vector ?

Thanks for your help

Dennis

[John Harrison]

Re: A list of objects with a template member shares address, why ???


"Dennis" <dler00TIL@cont rol.auc.dk> wrote in message
news:ud66oghtt. fsf@control.auc .dk...[color=blue]
> Hi
>
> I have a little problem as stated above (haven't found any solution on
> the www). I have a list of objects (particles) where I have a member
> of a template vector (array1d from TNT). I initialise these members in
> the constructor, but when I write different vector values to different
> particles the values becomes the same.
>
> I have found out that each particles vector are pointing to the same
> address :o(
> When I used an array instead of a template there where no problem. How
> do I initialise the template vector so each particle has it's own
> template vector ??
>
> Here are some snippets of code, which might be more understandable
> than my rambling:
>
> typedef TNT::Array1D<do uble> dVector3;
> //typedef double dVector3[3];
> enum orient {eHoris, eVertic};
>
> //-----------------------------
> typedef struct sParticle{
> dVector3 position; //position of particle
> sParticle():pos ition(3)
> {
> }
> }
>
> list<sParticle> particlePool;
> particlePool.re size(noParticle s);
> for(k=0;k<emitN oParticles;k++) {
> (*emit_iterator ).position[0] = k++
> }
>
> this works when i use my array vector, but when using the Array1D
> vector the position vector points to the same address for all
> particles.
>
> How do I ensure that each particle has its own vector ?
>[/color]

Here are a list of things that are undefined in the code you posted.

TNT::Array1D<do uble>
noParticles
emitNoParticles
emit_iterator

I cannot answer this question because these things are undefined, therefore
I cannot understand your code any better than you can.

Please read this, these are some guidelines about how to post code. Follow
these guidelines and you will get your question answered quickly.

http://www.parashift.com/c++-faq-lite/how-to-post.html#faq-5.8

john

[John Harrison]

Re: A list of objects with a template member shares address, why ???


"Dennis" <dler00TIL@cont rol.auc.dk> wrote in message
news:ud66oghtt. fsf@control.auc .dk...[color=blue]
> Hi
>
> I have a little problem as stated above (haven't found any solution on
> the www). I have a list of objects (particles) where I have a member
> of a template vector (array1d from TNT). I initialise these members in
> the constructor, but when I write different vector values to different
> particles the values becomes the same.
>
> I have found out that each particles vector are pointing to the same
> address :o(
> When I used an array instead of a template there where no problem. How
> do I initialise the template vector so each particle has it's own
> template vector ??
>
> Here are some snippets of code, which might be more understandable
> than my rambling:
>
> typedef TNT::Array1D<do uble> dVector3;
> //typedef double dVector3[3];
> enum orient {eHoris, eVertic};
>
> //-----------------------------
> typedef struct sParticle{
> dVector3 position; //position of particle
> sParticle():pos ition(3)
> {
> }
> }
>
> list<sParticle> particlePool;
> particlePool.re size(noParticle s);
> for(k=0;k<emitN oParticles;k++) {
> (*emit_iterator ).position[0] = k++
> }
>
> this works when i use my array vector, but when using the Array1D
> vector the position vector points to the same address for all
> particles.
>
> How do I ensure that each particle has its own vector ?
>[/color]

Here are a list of things that are undefined in the code you posted.

TNT::Array1D<do uble>
noParticles
emitNoParticles
emit_iterator

I cannot answer this question because these things are undefined, therefore
I cannot understand your code any better than you can.

Please read this, these are some guidelines about how to post code. Follow
these guidelines and you will get your question answered quickly.

http://www.parashift.com/c++-faq-lite/how-to-post.html#faq-5.8

john

[John Harrison]

Re: A list of objects with a template member shares address, why ???


"John Harrison" <john_andronicu s@hotmail.com> wrote in message
news:c4ovjv$2jr 2at$1@ID-196037.news.uni-berlin.de...[color=blue]
>
> "Dennis" <dler00TIL@cont rol.auc.dk> wrote in message
> news:ud66oghtt. fsf@control.auc .dk...[color=green]
> > Hi
> >
> > I have a little problem as stated above (haven't found any solution on
> > the www). I have a list of objects (particles) where I have a member
> > of a template vector (array1d from TNT). I initialise these members in
> > the constructor, but when I write different vector values to different
> > particles the values becomes the same.
> >
> > I have found out that each particles vector are pointing to the same
> > address :o([/color][/color]

On second thoughts maybe the answer is that TNT::Array1D is rubbish.

Why not use the *standard* vector class std::vector rather than dubious
third party stuff.

typedef std::vector<dou ble> dVector3;

I can promise you that a std::vector does not share memory with another
std::vector. Another advantage of using standard classes is that you can
post code here and everyone will know what you are using.

john

[John Harrison]

Re: A list of objects with a template member shares address, why ???


"John Harrison" <john_andronicu s@hotmail.com> wrote in message
news:c4ovjv$2jr 2at$1@ID-196037.news.uni-berlin.de...[color=blue]
>
> "Dennis" <dler00TIL@cont rol.auc.dk> wrote in message
> news:ud66oghtt. fsf@control.auc .dk...[color=green]
> > Hi
> >
> > I have a little problem as stated above (haven't found any solution on
> > the www). I have a list of objects (particles) where I have a member
> > of a template vector (array1d from TNT). I initialise these members in
> > the constructor, but when I write different vector values to different
> > particles the values becomes the same.
> >
> > I have found out that each particles vector are pointing to the same
> > address :o([/color][/color]

On second thoughts maybe the answer is that TNT::Array1D is rubbish.

Why not use the *standard* vector class std::vector rather than dubious
third party stuff.

typedef std::vector<dou ble> dVector3;

I can promise you that a std::vector does not share memory with another
std::vector. Another advantage of using standard classes is that you can
post code here and everyone will know what you are using.

john

[Dennis]

Re: A list of objects with a template member shares address, why???

On Sun, 4 Apr 2004 13:38:27 +0100
"John Harrison" <john_andronicu s@hotmail.com> wrote:
[color=blue]
>
> "Dennis" <dler00TIL@cont rol.auc.dk> wrote in message
> news:ud66oghtt. fsf@control.auc .dk...[color=green]
> > Hi
> >
> > I have a little problem as stated above (haven't found any solution
> > on the www). I have a list of objects (particles) where I have a
> > member of a template vector (array1d from TNT). I initialise these
> > members in the constructor, but when I write different vector values
> > to different particles the values becomes the same.
> >
> > I have found out that each particles vector are pointing to the same
> > address :o(
> > When I used an array instead of a template there where no problem.
> > How do I initialise the template vector so each particle has it's
> > own template vector ??
> >
> > Here are some snippets of code, which might be more understandable
> > than my rambling:
> >
> > typedef TNT::Array1D<do uble> dVector3;
> > //typedef double dVector3[3];
> > enum orient {eHoris, eVertic};
> >
> > //-----------------------------
> > typedef struct sParticle{
> > dVector3 position; //position of particle
> > sParticle():pos ition(3)
> > {
> > }
> > }
> >
> > list<sParticle> particlePool;
> > particlePool.re size(noParticle s);
> > for(k=0;k<emitN oParticles;k++) {
> > (*emit_iterator ).position[0] = k++
> > }
> >
> > this works when i use my array vector, but when using the Array1D
> > vector the position vector points to the same address for all
> > particles.
> >
> > How do I ensure that each particle has its own vector ?
> >[/color]
>
> Here are a list of things that are undefined in the code you posted.
>
> TNT::Array1D<do uble>
> noParticles
> emitNoParticles
> emit_iterator
>
> I cannot answer this question because these things are undefined,
> therefore I cannot understand your code any better than you can.
>[/color]

Well I thought it would be of no interrest to know the data types for
the above, but the noParticles, emitNoParticle are integers and
emit_iterator is an iterator for the list. But it isn't the iterator
that is a problem as it works when i'm using the array.

Regarding the use of a 3'rd party template is that I don't have to
implement all the functionality needed to make vector and matrix
calculations as that is done in advance.

Dennis

[Dennis]

Re: A list of objects with a template member shares address, why???

On Sun, 4 Apr 2004 13:38:27 +0100
"John Harrison" <john_andronicu s@hotmail.com> wrote:
[color=blue]
>
> "Dennis" <dler00TIL@cont rol.auc.dk> wrote in message
> news:ud66oghtt. fsf@control.auc .dk...[color=green]
> > Hi
> >
> > I have a little problem as stated above (haven't found any solution
> > on the www). I have a list of objects (particles) where I have a
> > member of a template vector (array1d from TNT). I initialise these
> > members in the constructor, but when I write different vector values
> > to different particles the values becomes the same.
> >
> > I have found out that each particles vector are pointing to the same
> > address :o(
> > When I used an array instead of a template there where no problem.
> > How do I initialise the template vector so each particle has it's
> > own template vector ??
> >
> > Here are some snippets of code, which might be more understandable
> > than my rambling:
> >
> > typedef TNT::Array1D<do uble> dVector3;
> > //typedef double dVector3[3];
> > enum orient {eHoris, eVertic};
> >
> > //-----------------------------
> > typedef struct sParticle{
> > dVector3 position; //position of particle
> > sParticle():pos ition(3)
> > {
> > }
> > }
> >
> > list<sParticle> particlePool;
> > particlePool.re size(noParticle s);
> > for(k=0;k<emitN oParticles;k++) {
> > (*emit_iterator ).position[0] = k++
> > }
> >
> > this works when i use my array vector, but when using the Array1D
> > vector the position vector points to the same address for all
> > particles.
> >
> > How do I ensure that each particle has its own vector ?
> >[/color]
>
> Here are a list of things that are undefined in the code you posted.
>
> TNT::Array1D<do uble>
> noParticles
> emitNoParticles
> emit_iterator
>
> I cannot answer this question because these things are undefined,
> therefore I cannot understand your code any better than you can.
>[/color]

Well I thought it would be of no interrest to know the data types for
the above, but the noParticles, emitNoParticle are integers and
emit_iterator is an iterator for the list. But it isn't the iterator
that is a problem as it works when i'm using the array.

Regarding the use of a 3'rd party template is that I don't have to
implement all the functionality needed to make vector and matrix
calculations as that is done in advance.

Dennis

[John Harrison]

Re: A list of objects with a template member shares address, why ???


"Dennis" <bugoff@cyberci ty.dk> wrote in message
news:2004040416 5841.6dde7f69.b ugoff@cybercity .dk...[color=blue]
> On Sun, 4 Apr 2004 13:38:27 +0100
> "John Harrison" <john_andronicu s@hotmail.com> wrote:
>[color=green]
> >
> > "Dennis" <dler00TIL@cont rol.auc.dk> wrote in message
> > news:ud66oghtt. fsf@control.auc .dk...[color=darkred]
> > > Hi
> > >
> > > I have a little problem as stated above (haven't found any solution
> > > on the www). I have a list of objects (particles) where I have a
> > > member of a template vector (array1d from TNT). I initialise these
> > > members in the constructor, but when I write different vector values
> > > to different particles the values becomes the same.
> > >
> > > I have found out that each particles vector are pointing to the same
> > > address :o(
> > > When I used an array instead of a template there where no problem.
> > > How do I initialise the template vector so each particle has it's
> > > own template vector ??
> > >
> > > Here are some snippets of code, which might be more understandable
> > > than my rambling:
> > >
> > > typedef TNT::Array1D<do uble> dVector3;
> > > //typedef double dVector3[3];
> > > enum orient {eHoris, eVertic};
> > >
> > > //-----------------------------
> > > typedef struct sParticle{
> > > dVector3 position; //position of particle
> > > sParticle():pos ition(3)
> > > {
> > > }
> > > }
> > >
> > > list<sParticle> particlePool;
> > > particlePool.re size(noParticle s);
> > > for(k=0;k<emitN oParticles;k++) {
> > > (*emit_iterator ).position[0] = k++
> > > }
> > >
> > > this works when i use my array vector, but when using the Array1D
> > > vector the position vector points to the same address for all
> > > particles.
> > >
> > > How do I ensure that each particle has its own vector ?
> > >[/color]
> >
> > Here are a list of things that are undefined in the code you posted.
> >
> > TNT::Array1D<do uble>
> > noParticles
> > emitNoParticles
> > emit_iterator
> >
> > I cannot answer this question because these things are undefined,
> > therefore I cannot understand your code any better than you can.
> >[/color]
>
> Well I thought it would be of no interrest to know the data types for
> the above, but the noParticles, emitNoParticle are integers and
> emit_iterator is an iterator for the list. But it isn't the iterator
> that is a problem as it works when i'm using the array.
>
> Regarding the use of a 3'rd party template is that I don't have to
> implement all the functionality needed to make vector and matrix
> calculations as that is done in advance.
>
> Dennis[/color]

Perhaps there is a bug in TNT::Array1D, perhaps there isn't a bug and you
are just using it incorrectly, perhaps its something completely different.
Taking a wild guess perhaps TNT::Array1D uses reference semantics and you
have to define a suitable copy constructor for sParticle, consult your
documentation.

I don't understand how you expect anyone to be able to solve your problem
with the amount of information given.

john

[John Harrison]

Re: A list of objects with a template member shares address, why ???


"Dennis" <bugoff@cyberci ty.dk> wrote in message
news:2004040416 5841.6dde7f69.b ugoff@cybercity .dk...[color=blue]
> On Sun, 4 Apr 2004 13:38:27 +0100
> "John Harrison" <john_andronicu s@hotmail.com> wrote:
>[color=green]
> >
> > "Dennis" <dler00TIL@cont rol.auc.dk> wrote in message
> > news:ud66oghtt. fsf@control.auc .dk...[color=darkred]
> > > Hi
> > >
> > > I have a little problem as stated above (haven't found any solution
> > > on the www). I have a list of objects (particles) where I have a
> > > member of a template vector (array1d from TNT). I initialise these
> > > members in the constructor, but when I write different vector values
> > > to different particles the values becomes the same.
> > >
> > > I have found out that each particles vector are pointing to the same
> > > address :o(
> > > When I used an array instead of a template there where no problem.
> > > How do I initialise the template vector so each particle has it's
> > > own template vector ??
> > >
> > > Here are some snippets of code, which might be more understandable
> > > than my rambling:
> > >
> > > typedef TNT::Array1D<do uble> dVector3;
> > > //typedef double dVector3[3];
> > > enum orient {eHoris, eVertic};
> > >
> > > //-----------------------------
> > > typedef struct sParticle{
> > > dVector3 position; //position of particle
> > > sParticle():pos ition(3)
> > > {
> > > }
> > > }
> > >
> > > list<sParticle> particlePool;
> > > particlePool.re size(noParticle s);
> > > for(k=0;k<emitN oParticles;k++) {
> > > (*emit_iterator ).position[0] = k++
> > > }
> > >
> > > this works when i use my array vector, but when using the Array1D
> > > vector the position vector points to the same address for all
> > > particles.
> > >
> > > How do I ensure that each particle has its own vector ?
> > >[/color]
> >
> > Here are a list of things that are undefined in the code you posted.
> >
> > TNT::Array1D<do uble>
> > noParticles
> > emitNoParticles
> > emit_iterator
> >
> > I cannot answer this question because these things are undefined,
> > therefore I cannot understand your code any better than you can.
> >[/color]
>
> Well I thought it would be of no interrest to know the data types for
> the above, but the noParticles, emitNoParticle are integers and
> emit_iterator is an iterator for the list. But it isn't the iterator
> that is a problem as it works when i'm using the array.
>
> Regarding the use of a 3'rd party template is that I don't have to
> implement all the functionality needed to make vector and matrix
> calculations as that is done in advance.
>
> Dennis[/color]

Perhaps there is a bug in TNT::Array1D, perhaps there isn't a bug and you
are just using it incorrectly, perhaps its something completely different.
Taking a wild guess perhaps TNT::Array1D uses reference semantics and you
have to define a suitable copy constructor for sParticle, consult your
documentation.

I don't understand how you expect anyone to be able to solve your problem
with the amount of information given.

john

[David Harmon]

Re: A list of objects with a template member shares address, why ???

On 04 Apr 2004 12:26:06 +0200 in comp.lang.c++, Dennis
<dler00TIL@cont rol.auc.dk> wrote,[color=blue]
>for(k=0;k<emit NoParticles;k++ ){
> (*emit_iterator ).position[0] = k++
>}[/color]

I second John's objections, and add that it seems unlikely that you
really want to increment k twice in this loop.

[David Harmon]

Re: A list of objects with a template member shares address, why ???

On 04 Apr 2004 12:26:06 +0200 in comp.lang.c++, Dennis
<dler00TIL@cont rol.auc.dk> wrote,[color=blue]
>for(k=0;k<emit NoParticles;k++ ){
> (*emit_iterator ).position[0] = k++
>}[/color]

I second John's objections, and add that it seems unlikely that you
really want to increment k twice in this loop.

[Dennis]

Re: A list of objects with a template member shares address, why ???

"John Harrison" <john_andronicu s@hotmail.com> writes:
[color=blue]
> Perhaps there is a bug in TNT::Array1D, perhaps there isn't a bug and you
> are just using it incorrectly, perhaps its something completely different.
> Taking a wild guess perhaps TNT::Array1D uses reference semantics and you
> have to define a suitable copy constructor for sParticle, consult your
> documentation.[/color]

Either it is a bug or I have to make a suitable copy constructor,
because it works with the STL::vector
[color=blue]
> I don't understand how you expect anyone to be able to solve your problem
> with the amount of information given.[/color]

I'm so sorry, I just hoped that somebody that were using the TNT
package were able to help me. But thanks for your time anyway.

Dennis

[Dennis]

Re: A list of objects with a template member shares address, why ???

"John Harrison" <john_andronicu s@hotmail.com> writes:
[color=blue]
> Perhaps there is a bug in TNT::Array1D, perhaps there isn't a bug and you
> are just using it incorrectly, perhaps its something completely different.
> Taking a wild guess perhaps TNT::Array1D uses reference semantics and you
> have to define a suitable copy constructor for sParticle, consult your
> documentation.[/color]

Either it is a bug or I have to make a suitable copy constructor,
because it works with the STL::vector
[color=blue]
> I don't understand how you expect anyone to be able to solve your problem
> with the amount of information given.[/color]

I'm so sorry, I just hoped that somebody that were using the TNT
package were able to help me. But thanks for your time anyway.

Dennis

[Kevin Goodsell]

Re: A list of objects with a template member shares address, why???

Dennis wrote:
[color=blue]
>
> I'm so sorry, I just hoped that somebody that were using the TNT
> package were able to help me. But thanks for your time anyway.
>[/color]

I've never even heard of TNT. This is usually not the best place to find
help with particular non-standard libraries. Aside from being off-topic
here, the people qualified to help with them are usually elsewhere. The
library vendor may have a forum or mailing list you can try -- that's
usually the best place to look.

-Kevin
--
My email address is valid, but changes periodically.
To contact me please use the address from a recent posting.

[Kevin Goodsell]

Re: A list of objects with a template member shares address, why???

Dennis wrote:
[color=blue]
>
> I'm so sorry, I just hoped that somebody that were using the TNT
> package were able to help me. But thanks for your time anyway.
>[/color]

I've never even heard of TNT. This is usually not the best place to find
help with particular non-standard libraries. Aside from being off-topic
here, the people qualified to help with them are usually elsewhere. The
library vendor may have a forum or mailing list you can try -- that's
usually the best place to look.

-Kevin
--
My email address is valid, but changes periodically.
To contact me please use the address from a recent posting.