Create arrays with constructor problem

Hello,

I think the title i snot the best. Here is my problem:

Code:

---

IntArray v(7);  // creates an integer array with size 7
IntArray v[10]; // creates an array with 10 elements where each element is an integer array (with size 0)

---

I now want to connect these both and want to create an array with 10 IntArray elements, where every IntArray has size 7. Is this possible?

Best greetings and thanks for the help,
Dee

There is no such variable type as 'IntArray'. If you've typedef-ed one, then you need to show us what it is. If it's a macro, show that too. Otherwise, you're wrong on all accounts.


Quzah.

Hello!

Unfortunately I think I've posted in the wrong board. It should be a C++ problem! Some mod may be so nice and move it please.

IntArray is just a class with something like int *A[]... only that the boundaries are checked before.

At the end I just want to have something like int *q[7][10] but with my IntArray.

Greetings,
Dee

what is [b]???? Maybe its me but I don't get your post. if you want to set something like int q[7][10] through a constructor, pass it 2 integers and make those your indices. Some code would have helped wonders.

Code:

---

class IntArray
{
public:
  IntArray(int a, int b);
  ~IntArray();
private:
  int* array;
  int rows;
};

IntArray::IntArray(int a, int b)
{
  array = new int[a][b];
  rows = a;
}

IntArray::~IntArray()
{
  for( int i=0; i<rows; i++ )
  {
    if( array[i] )
    {
      delete [] array[i];
      array[i] = 0;
    }
  }
  delete [] array;
} // always cleanup :)

---

I didn't even know C had constructors.

@durban: The [b] was vB-Code. :) Should be bold, but I correct it now... I hope the meaning is now a little bit clearer.

And you want code, so I post some:

Code:

---

class IntArray {              // IntArray

public:
  IntArray(void);                      // standard constructor
  IntArray(const unsigned int l);      // standard constructor

private:
  int* values;                  // array of integer for values
  unsigned int length;        // size of array
};

IntArray::IntArray(void){    // standard constructor
  length=0;              // set length of array for better indexing
  values=NULL;
};

IntArray::IntArray(const unsigned int l){  // standard constructor

  length=l;              // set length of array for better indexing
  if (length) {
    values=new int[l];
    for (unsigned int i=0; i<length; i++) values[i]=0;
  }
  else values=NULL;
};

IntArray::~IntArray() {            // destructor
  if (values) delete[] values;    // give memory free
};

---

Your code is good, I only thought that there is a solution in C or C++ that gives me the same with one line, because with

Code:

---

IntArray v=IntArray[10]

---

my first constructor is called and set the length to 0.

So my question again: Is it possible to call the second constructor with a number l?

@Learner: As I said in my second post I've chosen the wrong message board.

Sorry for all the chaos... :(

Greetings, Dee

Ah, i think i see your problem. Unfortunately, 1 line obviously can't do this because you would want different l values for each IntArray right?

Code:

---

IntArray* v[10];
v[0] = new IntArray(5);
v[1] = new IntArray(10);
etc..

---

Try that code

Different sizes in each entry as you said would be the next. And I think the only way to init these arrays is with a ingle initialisation as you mentioned it...

At this time I do it as:

Code:

---

Int Array *v[10];
for (int i=0; i<10; i++) v[i]=new IntArray(5)

---

But I thought you could it do shorter... Something like

Code:

---

Int Array v(5)[10]

---

that creates 10 IntArrays with size 5.

Greetings, Dee