create a class which creates an array[a,b] of arbitrary sizes

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21

Sounds like an ideal Iliffe vector application.

Let us know how it goes.

22

that is what my question is about, let me rephrase it::

I want to create a class which creates an array[a,b] of arbitrary sizes by the constructor.

I now found a way to create a 1-dim array by assert, but I always fail by trying to create a 2-dim array.

exit status 1
array size in operator new must be constant

Which would be the correct way to do that?

#include <cassert>
 
class tMenu {
  
  protected:         
        char * list;
        char MENULEN, CAPTLEN;      
  
  public:      
    
     tMenu (char menulen, char captlen) // constructor
     {
        assert(menulen > 0); 
        assert(captlen > 0); 
        list = new char[menulen];            // works fine!
    //  list = new char[menulen][captlen];   // alternat. >> error!
        MENULEN = menulen;
        CAPTLEN = captlen;
     }      

 
     ~tMenu() // destructor
     {
       // Dynamically delete the array we allocated earlier
       delete[] list ;
     }

};
23

I now found a way to create a 1-dim array by assert,

assert is normally used to halt things when anomalous situations are encountered, to aid debugging.

Nothing at all to do with memory allocation

24

edit:
I think I found it out:

        MENULEN = menulen;
        CAPTLEN = captlen;
       
        list = new char*[MENULEN];
        for(int i = 0; i < MENULEN; i++)
        {
          list[i] = new char[CAPTLEN];
        }        
     }