Compiler Error C2682

 

For the latest documentation on Visual Studio 2017 RC, see Visual Studio 2017 RC Documentation.

cannot use casting_operator to convert from 'type1' to 'type2'

A casting operator tried to convert between incompatible types. For example, you cannot use the dynamic_cast operator to convert a pointer to a reference. The dynamic_cast operator cannot be used to cast away qualifiers. All qualifiers on the types must match.

You can use the const_cast operator to remove attributes such as const, volatile, or __unaligned.

The following sample generates C2682:

// C2682.cpp  
class A { virtual void f(); };  
class B: public A {};  
  
void g(A* pa) {  
    B& rb = dynamic_cast<B&>(pa); // C2682  
}  

The following sample generates C2682:

// C2682b.cpp  
// compile with: /clr  
ref struct R{};  
ref struct RR : public R{};  
ref struct H {  
   RR^ r ;  
   short s;  
   int i;  
};  
  
int main() {  
   H^ h = gcnew H();    
   interior_ptr<int>lr = &(h->i);  
   interior_ptr<short>ssr = safe_cast<interior_ptr<short> >(lr);   // C2682  
   interior_ptr<short>ssr = reinterpret_cast<interior_ptr<short> >(lr);   // OK  
}  

Show: