Compiler Error C2697

'array' : must explicitly specify __gc or __nogc for an array declared in a managed type

This error indicates that an array was not explicitly marked as unmanaged or managed in a __gc class.

C2697 is only reachable using /clr:oldSyntax.

The following sample generates C2697:

// C2697.cpp
// compile with: /clr:oldSyntax
#using <mscorlib.dll>
__gc class a {
public:
   int gc_arr[12];  // C2697
   // try the following line instead
   // int gc_arr __gc [];

   // example of a static array
   static int * static_gcarr = gc new int [10];

   // example of a __nogc array
   int nogc_arr __nogc [2];
};

int main() {
   a *mya = new a;
   mya -> gc_arr = new int __gc [2];

   mya -> gc_arr[0] = 33;
   System::Console::WriteLine(mya -> gc_arr[0]);

   mya -> static_gcarr[0] = 44;
   System::Console::WriteLine(mya -> static_gcarr[0]);

   mya -> gc_arr[0] = 55;
   System::Console::WriteLine(mya -> gc_arr[0]);
}