Initializing objects in array of pointer to objects

Question

Having trouble initializing these custom (not STL) List objects with the following implementation. The Graph class contains an array of pointers to custom List objects. I'm pretty sure I went somewhere wrong with how I declared my lists array.

Snippet of header:

class Graph
{
    private:
        List **lists;
        int listCount;
    public:
        .......
        .......
}

Snippet of implementation:

//node integer is used for size of array
void Graph::setLists(int node)
{
    listCount = node;
    lists = new List[listCount];

    //for is used to initialized each List element in array
    //The constructor parameter is for List int variable
    for(int i = 0; i < listCount; i++)
        lists[i] = new List(i);
}

Errors I'm getting:

Graph.cpp: In member function ‘void Graph::setLists(int)’:
Graph.cpp:11:28: error: cannot convert ‘List*’ to ‘List**’ in assignment

What is List supposed to do and what is Graph supposed to do? — rwols
– rwols, Commented Jul 2, 2013 at 20:48

Captain Obvlious · Accepted Answer · 2013-07-02 20:49:31Z

4

The only problem I see is that you are trying to initialize lists with with an array of List objects instead of an array of pointers to List objects.

change

lists = new List[listCount];

to

lists = new List*[listCount];

answered Jul 2, 2013 at 20:49

Captain Obvlious

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Comments

Lochemage · Accepted Answer · 2013-07-02 20:50:46Z

0

Because you are creating an array of List objects, and not an array of List pointers.

lists = new List*[listCount];

answered Jul 2, 2013 at 20:50

Lochemage

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