Compiler Error C3868

'type': constraints on generic parameter 'parameter' differ from those on the declaration

Remarks

Multiple declarations must have the same generic constraints. For more information, see Generics.

Example

The following example generates C3868.

// C3868.cpp
// compile with: /clr /c
interface struct I1;

generic <typename T> ref struct MyStruct;
generic <typename U> where U : I1 ref struct MyStruct;   // C3868

// OK
generic <typename T> ref struct MyStruct2;
generic <typename U> ref struct MyStruct2;

generic <typename T> where T : I1 ref struct MyStruct3;
generic <typename U> where U : I1 ref struct MyStruct3;