I've created a new header file in which one will find :

#using <mscorlib.dll>
using namespace System;

__gc class G
{
public:
  int k;
  int sum(int){return 0;}
};

a really basic managed class.

In the same header file is a normal C++ class definition

class Temp1
{
public:
    Temp1(){G *g=new G;}
    ~Temp1();

};

Now in some old code I have tried

G *g=new G;  //fail
Temp1 t;    //ok - works as a wrapper class

error C3828: 'G': placement arguments not allowed while creating
instances of managed classes

So why does my wrapper class work in declaring a managed class object
whilst creating it directly cause a compiler error???

Cheers