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Compiler Error C3214

  • Article

'type' : invalid type argument for generic parameter 'param' of generic 'generic_type', does not meet constraint 'constraint'

The type was specified for an instantiation of a generic class that does not meet the generic class's constraint.

The following sample generates C3214:

// C3214.cpp
// compile with: /clr
interface struct A {};

generic <class T>
where T : A
ref class C {};

ref class X : public A {};

int main() {
   C<int>^ c = new C<int>;   // C3214
   C<X ^> ^ c2 = new C<X^>;   // OK
}