void RenderObjects()
{
for(iter = m_objects.begin(); iter = m_objects.end(); ++iter)
{
iter->Render();
}
}
Vector Problems (Iterators) - no more now SOLVED
Author
I am using Visual C++ 6.0 and the problem I am having is probably very simple. I have this code:
Declaration of some used variables:
vector<object*> m_objects;
vector<object*>::iterator iter;
The place where it all goes wrong:
Now the error that is given is:
error C2227: left of '->Render' must point to class/struct/union
I don't understand what i'm doing wrong. The compiler can see all the variables but it is asthough it doesn't recognise iter as an object.
[Edited by - Meganan on April 20, 2006 3:16:14 AM]
Author
Right you are...*sheepishly lowers head* (I feel so ashamed)
Thankyou jyk
Now I have another problem and i think it is best described by the code:
I am unable to discover what is going wrong and i get a linking error as follows:
error C2512: 'Swarmer' : no appropriate default constructor available
Thankyou for your time.
BTW object *obj = NULL; is declared at the start
[Edited by - Meganan on April 19, 2006 12:54:57 AM]
Thankyou jyk
Now I have another problem and i think it is best described by the code:
Where problems occur:main code...case VK_LEFT: obj = new Swarmer; g_glRender->AddNewObject(obj); break;...Declaration of the different objects:class object{public: object(float mx, float my, float mz): x(mx), y(my), z(mz){} float x, y, z; bool solid; bool visible; bool Step(); virtual void Render();};class Swarmer : public object{public: bool Step(); virtual void Render();};The adding a new object functuon definition:bool AddNewObject(object* obj){ m_objects.push_back(obj); return true;}I am unable to discover what is going wrong and i get a linking error as follows:
error C2512: 'Swarmer' : no appropriate default constructor available
Thankyou for your time.
BTW object *obj = NULL; is declared at the start
[Edited by - Meganan on April 19, 2006 12:54:57 AM]
As the error says, there is no default (i.e. no parameters or all default parameters) constructor for swarmer.
You could add a swarmer::swarmer() constructor but then it will complain about no default constructor for object. You either need to also create a () constructor for object (that for example sets the x, y and z to zero) or
swarmer::swarmer(float mx,float my,float mz) : object(mx,my,mz) { }
and pass values in when you create the new swarmer
or perhaps
swarmer::swarmer() : object(0,0,0) { }
would create a swarmer with objects x,y and z being initially set to zero when you go new swarmer()
Most flexible would be
swarmer::swarmer(float mx=0,float my=0,float mz=0) : object(mx,my,mz) { }
then you could do either.
You could add a swarmer::swarmer() constructor but then it will complain about no default constructor for object. You either need to also create a () constructor for object (that for example sets the x, y and z to zero) or
swarmer::swarmer(float mx,float my,float mz) : object(mx,my,mz) { }
and pass values in when you create the new swarmer
or perhaps
swarmer::swarmer() : object(0,0,0) { }
would create a swarmer with objects x,y and z being initially set to zero when you go new swarmer()
Most flexible would be
swarmer::swarmer(float mx=0,float my=0,float mz=0) : object(mx,my,mz) { }
then you could do either.
I'm just a newbie to C++, but isn't there a problem with that loop?
for(iter = m_objects.begin(); iter = m_objects.end(); ++iter)
Shouldn't it be "iter != m_objects.end()"? The way it is written isn't iter just being set to end() the first time through the loop?
eugenek
for(iter = m_objects.begin(); iter = m_objects.end(); ++iter)
Shouldn't it be "iter != m_objects.end()"? The way it is written isn't iter just being set to end() the first time through the loop?
eugenek
Quite correct, AP, as far as I can see. Either != or < would be right. Can't remember which.
Author
Yes yes you were right I noticed that myself.
BTW i spend a good ten - fifteen hours on this and i finally got it working. I'm pretty estatic about it. I'm finally getting there; now theres only the rest of my life worth of learning ahead. LOL.
Thankyou all for your help.
N.B. I think i can safely say this is solved...so i'll edit the topic...done
BTW i spend a good ten - fifteen hours on this and i finally got it working. I'm pretty estatic about it. I'm finally getting there; now theres only the rest of my life worth of learning ahead. LOL.
Thankyou all for your help.
N.B. I think i can safely say this is solved...so i'll edit the topic...done
This topic is closed to new replies.
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