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Article #3746

Basic C++ Question...

#3746
From: pnunn
Date: Thu, 04 May 2006 13:33
45 lines
2342 bytes
Folks.. I'm stuck on a problem that should be easy to sort out but I 
can't get to work.

I have a base class defined that has a pointer to a structure in it.

struct stateTable *table;

and a public function setTable that takes a passed in pointer and sets 
table to it...

In the derived class I have (in the constructor)

    struct stateLine binTable[] =
    {
	   //current state, A0, A1, next state
	   {1, High, Low, 2},
	   {1, High, High, 4},
	   {1, Low, High, 5},
	   {2, Low, Low, 1},
	   {2, High, High, 4},
	   {4, High, Low, 3},
	   {3, Low, Low, 1},
	   {3, Low, High, 4},
	   {5, High, High, 4},
	   {5, Low, Low, 1}
    };

    setTable(binTable);

Now.. when I go to use table in other functions.. table points to 
nothing useful.. and I guess its because as binTable goes out of scope, 
so does the memory its using... so I guess I can see why its not 
working, but, I can't work out how to make it work.

If I have a stateTable* in the derived class, how do I dynamically make 
the table and pass it to the base class?

I'd really rather build the table as the above code shows, but then how 
do I pass that to the base class and have it still be there?

I know this is basic C++, but any help greatly appreciated.

Ta.

Peter.
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