Make class variable available in other scopes? c++

Question

In the constructor of a class I have I create an array with the needed size like this:

ArrayClass::ArrayClass(int size) 
{
    Number* nmbr = new Number[size];
}

and

ArrayClass::ArrayClass()
{ 
    Number* nmbr = new Number[2];
}

I also have it specified in the header as

Number* nmbr;

While the creation of the array itself works I can't seem to access it outside of the constructor. It seems like whenever I leave the constructor the variable gets freed from the memory. How do I prevent this so I can use the variable when calling the other functions in the class?

Answer 1

Don't create a new variable. The nmbr in your constructors are different from each other and the one in the header.

If you must use a global (think three times about doing this) declare it as extern, define it in a single TU, and just use

 nmbr = new ArrayClass[2];

in your constructors.

Don't forget to clean up the memory or about the rule of three.