void* error

This is a discussion on void* error within the C++ Programming forums, part of the General Programming Boards category; Hi all. I've a problem with the void*. I explain it: Code: void leggi_vettore(void* & v, int n, int t){ ...

  1. #1
    Registered User
    Join Date
    Dec 2010
    Posts
    1

    void* error

    Hi all.

    I've a problem with the void*. I explain it:

    Code:
    void leggi_vettore(void* & v, int n, int t){
    	if(t==1){
    		v = new float[n];
    	}else if(t==0){
    		v = new unsigned short[n];
    	}else cout << "Error!";
    	for (int i=0 ; i<n ; i++){
    		cout << "Inserimento in posizione [ " << i << " ]: ";
    		cin >> v[i];
    	}
    }
    I want to have a dynamic array and I want to decide with "int t" if it must be float or unsigned short.
    When I did "cin >> v[i];" the compiler makes this error: "void* is not a pointer to object type".

    What I can do?

  2. #2
    Registered User
    Join Date
    Jun 2005
    Posts
    6,307
    You need to convert v to an appropriate (non-void) pointer type, otherwise v[i] is invalid (there is no such thing in C++ as an array of voids).

    All the compiler knows about v in your last loop is that it is a pointer to void. It does not magically keep track of the fact you've created arrays of different types just beforehand - hence the complaint.
    Right 98% of the time, and don't care about the other 3%.

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