VC++ Map

This is a discussion on VC++ Map within the C++ Programming forums, part of the General Programming Boards category; Hi guys, Can any of you tell me how to use map in C++ please? Thanks...

  1. #1
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    VC++ Map

    Hi guys,

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

    Thanks

  2. #2
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    I can tell you how to use google if you want.

    What do you want to know ?

  3. #3
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    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?

  4. #4
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    Quote Originally Posted by GOBLIN-85 View Post
    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.

  5. #5
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    just a thought
    Code:
    v->[i];
    should probably be
    Code:
    *v[i];
    im not positive, but that looks wierd to me

  6. #6
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    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.

  7. #7
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    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?
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