Array of class and a pointer to it

  • Thread starter Thread starter Guest
  • Start date Start date
G

Guest

Hello,

I defined a class name MyClass.

I would like to define an array of 4 by 8 of that class.
I would like to define a pointer to the array of MyClass.

I tried it with static definition:
MyClass m_MyClass[4][8] ;
I can not seem to find the way to define a pointer to this array?!?!?

I tried also to define it with the new operator but had similar results.

Any ideas how to do it?

Eitan
 
How about
MyClass ** ppMyClass;
ppMyClass=m_MyClass; or the same
ppMyClass=&m_MyClass[0][0];
or dynamically
MyClass ** ppMyClass=new MyClass *[4]
for (int i=0;i<8;++i){
ppMyClass=new MyClass [8]
}

Don't forget to do the same when you delete (not just delete[]ppMyClass)
Hope it helps,
Boni
 
Boni said:
How about
MyClass ** ppMyClass;
ppMyClass=m_MyClass; or the same
Click to expand...

No, the above line is invalid.

ppMyClass=&m_MyClass[0][0];
Click to expand...

and this line is also invalid.

or dynamically
MyClass ** ppMyClass=new MyClass *[4]
for (int i=0;i<8;++i){
ppMyClass=new MyClass [8]
}
Click to expand...


Ah, but that's not the same, is it? You have created an array of pointers,
not a two-dimensional array, which is what the OP wants.

Brian
 
No, the above line is invalid.
and this line is also invalid.
Click to expand...
Hi Brian,
thanks to pointing that out. I am sorry for that advice.
Ah, but that's not the same, is it? You have created an array of pointers,
not a two-dimensional array, which is what the OP wants.
Click to expand...
I think you are wrong on that. There is physically no such thing as a 2
dimentional array in the memory. It is array of pointers to pointers. The
first operator[] take the pointer to the array of values the second
operator[] takes the value.
With best regards,
Boni
 
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