Dictionary with user defined values

ngambek2003

How do I add values to a dictionary?

I have slice classes defined as follows

class A
{
int a;
};

class B extends A
{
int b;
};

dictionary<int, A> ASeq;

Now in my c++ code I have the following function

void AddToMap(const APtr &pA)
{
m_mapA[pA->a] = pA
}

I get a compilation error about a private destructor.

Thanks

bernard

Hi Budyanto,

I just tried to reproduce this compilation error, unfortunately without success. I updated the minimal C++ demo with:

class A
{
   int x;
};

class B extends A
{ 
   int y;
};

dictionary<int, A> AMap;

in Hello.ice

and

class Test
{
public:

   void AddToMap(const APtr& pA)
   {
	   _map[pA->x] = pA;
   }

private:
	AMap _map;
};

in Client.cpp

and as expected, it compiled fine (with Visual Studio 2010).

Can you provide a complete test-case?

Thanks,
Bernard

ngambek2003

Hi Bernard,

Thanks...I just tried it again and it does compile fine now.

Initiallly I did not pass in APtr into the function. It might have failed then. I was passing in A.

I thought I tried compiling after changing it to APtr.

Oh well. Thanks anyway.

ngambek2003

So actually in the C++ mapping AMap is really map<int, APtr> and not map<int, A>.

If I use the streaming api to stream the map into bytes that should work right?
It would know that A in the map is really APtr.

Thanks.

marc

Yes, Ice always uses smart pointers for class instances. The streaming API will stream the contents of the class instance, regardless of the language mapping. Have a look at the writeObject method as described here.