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How to Nest CArrays in Visual C++.NET

Posted on 2004-10-12
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Last Modified: 2010-05-18
From an earlier discussion (using VC++ 6)  I was told that in Visual C++.NET we could create nested CArrays without having to create a copy constructor
But in the following test I still get the error

error C2664: 'CArray<TYPE,ARG_TYPE>::Add' : cannot convert parameter 1 from 'ANG1' to 'ANG1'
        with
        [
            TYPE=ANG1,
            ARG_TYPE=ANG1
        ]
        No copy constructor available for class 'ANG1' or constructor attempts to perform illegal conversion to non-__gc reference

Howdo we nest CArrays in Visual C++.NET??

class ANG1
{
public:
      CArray <double,double> dAngs1;
};

class ANG2
{
public:
      CArray <ANG1,ANG1> dAngs2;
      
};

      double dAng = 1.0;
      ANG1 myAng1;
      myAng1.dAngs1.Add(dAng);
      ANG2 myAng2;

      myAng2.dAngs2.Add(myAng1);
0
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Question by:MCofer
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3 Comments
 
LVL 12

Accepted Solution

by:
OnegaZhang earned 1000 total points
ID: 12294995
The following works, any way.

class ANG1
{
public:
      CArray <double> dAngs1;
      ANG1& operator=(const ANG1& a)
      {
            this->dAngs1.Copy(a.dAngs1) ;
            return *this;
      }
};

class ANG2
{
public:
      CArray <ANG1> dAngs2;

};
      double dAng = 1.0;
      ANG1 myAng1;
      myAng1.dAngs1.Add(dAng);
      ANG2 myAng2;

      myAng2.dAngs2.Add(myAng1);
0
 

Author Comment

by:MCofer
ID: 12295056
I can't find the MSDN note that said you didn't need a copy constructor in .NET for CArrays
As you can guess this is only a simple test. the actual copy constructors I have to create are large and the only reason it is necessary is one CArray.
If anyone can find any documentation on MSDN it would be very helpful.

You code works so I will gon ahead and accept the answer.


Thanks
0
 
LVL 12

Expert Comment

by:OnegaZhang
ID: 12295149
In my project, I would use CArray( ANG1*) since copy a struct is expensive.

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