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How to: Use safe_cast and Generic Types

The following sample shows that safe_cast can perform a downcast with a generic type.

// safe_cast_generic_types.cpp
// compile with: /clr
interface struct I {};

generic<class T> where T:I
ref struct Base {
   T t;
   void test1() {}

generic<class T> where T:I
ref struct Derived:public Base <T> {};

ref struct R:public I {};

typedef Base<R^> GBase_R;
typedef Derived<R^> GDerived_R;

int main() {
   GBase_R^ br = gcnew GDerived_R();
   GDerived_R^ dr = safe_cast<GDerived_R^>(br);