VC++ Map

Hi guys,

Can any of you tell me how to use map in C++ please?

Thanks

I can tell you how to use google if you want.

What do you want to know ?

Sorry, I should post the code earlier. Here's what I'm trying to do:

Code:

---

void GLMesh::convertToDiffCoord(Mesh *m)
{
        //get the pointer to the list of pointers to all vertices
        list<Vertex*>* v = m->get_vertices();

        //initialize a map that will map each vertex pointer with an unique key
        map<int, Vertex*> VMap;

        //initialize iterator for the pointer list v
        list<Vertex*>::iterator vi;

        //iterate through the list and map each member in the list with a unique value
        for (int i=0; i<v->size(); i++)
                for(vi = v->begin(); vi != v->end(); vi++)
                        VMap[i] = v->[i];
}

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I keep getting the error :"syntex error '[' ", any idea what's wrong?

Quote:

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Originally Posted by GOBLIN-85

Sorry, I should post the code earlier. Here's what I'm trying to do:

Code:

---

void GLMesh::convertToDiffCoord(Mesh *m)
{
        //get the pointer to the list of pointers to all vertices
        list<Vertex*>* v = m->get_vertices();

        //initialize a map that will map each vertex pointer with an unique key
        map<int, Vertex*> VMap;

        //initialize iterator for the pointer list v
        list<Vertex*>::iterator vi;

        //iterate through the list and map each member in the list with a unique value
        for (int i=0; i<v->size(); i++)
                for(vi = v->begin(); vi != v->end(); vi++)
                        VMap[i] = v->[i];
}

---

I keep getting the error :"syntex error '[' ", any idea what's wrong?

---

Probably because v->[i] doesn't make any sense.

just a thought

Code:

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v->[i];

---

should probably be

Code:

---

*v[i];

---

im not positive, but that looks wierd to me

Your use of the map is fine.

Your for loops need work. You should only have one loop that increments i and vi together. Then, you probably want VMap[i] = *vi, since vi is an iterator to a list<Vertex*> and so *vi is a Vertex* which is what you're storing in a map.

If all you're going to do is map integers from 0 to some value in sequential order, wouldn't that make it a vector?