compiler-error-c3290.md

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Learn more about: Compiler Error C3290	Compiler Error C3290	11/04/2016	C3290	C3290	0baf684b-1143-4953-ac99-a2fa267d8017

Compiler Error C3290

'type' : a trivial property cannot have reference type

A property was declared incorrectly. When you declare a trivial property, the compiler creates a variable that the property will update, and it is not possible to have a tracking reference variable in a class.

See property and Tracking Reference Operator for more information.

Example

The following sample generates C3290.

// C3290.cpp
// compile with: /clr /c
ref struct R {};

ref struct X {
   R^ mr;

   property R % y;   // C3290
   property R ^ x;   // OK

   // OK
   property R% prop {
      R% get() {
         return *mr;
      }

      void set(R%) {}
   }
};

int main() {
   X x;
   R% xp = x.prop;
}