Compiler Error C3771

"identifier" : friend declaration cannot be found in the nearest namespace scope

Remarks

The class template declaration for the specified template identifier cannot be found within the current namespace.

To correct this error

• Ensure that the class template declaration for the template identifier is defined in the current namespace or that the template identifier is a fully-qualified name.

Example

The following code example declares a class template and function in namespace NA, but attempts to declare a friend function template in namespace NB.

// C3771.cpp
// compile with: /c

namespace NA {
template<class T> class A {
    void aFunction(T t) {}
    };
}
// using namespace NA;
namespace NB {
    class X {
        template<class T> friend void A<T>::aFunction(T); // C3771
// try the following line instead
//      template<class T> friend void NA::A<T>::aFunction(T);
// or try "using namespace NA;" instead.
    };
}

See also

Templates