Compiler Error C3627

 

For the latest documentation on Visual Studio 2017 RC, see Visual Studio 2017 RC Documentation.

Only a value type can be boxed

Only value classes can be boxed.

The following sample generates C3627:

// C3627.cpp  
// compile with: /clr:oldSyntax  
#using <mscorlib.dll>  
  
__value class vA {  
};  
  
__gc class A {  
};  
  
int main()  
{  
   A* a;  
   __box(a);   // C3627  
  
   // box a value type  
   vA va;  
   __box(va);  
}  

Show: