Thread: Nested pointer arrays

Hi,
I am writing a c++ simulation program and have come accross a bug, so i ask the follwing question.

I have the following class

Code:

class Client{
public:
   struct packet
	{
		int more;
	};

    packet *transfer
}

Code:

int main{
           
            Client *cl;
            cl = new Client [numOfCli];
            cin >> const;
            cl[0].transfer = new Client::packet [const];
            cl[1].transfer = new Client::packet [const];

           return 0;

}

My question is will the above code work as intended?
I ask this because I thought when memory is allocated for the "cl" array

Code:

 cl = new Client[numOfCli];

, the compiler does not yet know the size of the "transfer" array, so how does it know how much memory to allocate for the "cl" array.

In my program I am getting problems where variables such as "more" above are changing unexpectably, so I thought maybe there is a memory overlap somwhere.

My question is will the above code work as intended?

Well, it depends on what you intended, but if you intended it to compile and run then it won't. The biggest problem is that const is a type qualifier, not a valid variable name. You can't use const as a variable for input or as an array size because it doesn't have an address or a value.

so how does it know how much memory to allocate for the "cl" array.

transfer isn't an array though, it's a pointer. The compiler knows exactly how big a pointer is.

So what you are saying is that it is ok to allocate memory the way I have done it above?

Sure. The data corruption is probably caused by something else that seems unrelated.