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How to: Cannot Use Tracking References and Unary "Take-Address" Operator

Visual Studio 2008

The following sample shows that a tracking reference cannot be used as a unary take-address operator.

// tracking_reference_unary.cpp
// compile with: /clr
using namespace System;
ref struct R {
   static R^ operator%(R ^r) {   // C2805 can't declare unary operator%()
      return nullptr;
   static int operator&(R ^r) {  // can declare a unary operator&()
      return 1;

int main() {
   int i;
   int* pi1 = &i; // OK: C++ address of operator&()
   int* pi2 = %i; // ERROR: No managed address of operator%()
   int^ hi = %i; // ERROR: No managed address of operator%()