NGWS SDK Documentation  

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Compiler Error C2687

cannot define a nested UDT of a template class out of line

A nested UDT (user-defined type) was implemented (defined) outside of its class, which is not supported by the Visual C++ compiler.

The following sample generates C2687:

template <class T>
struct A {
   struct B;
};
template <class T>
struct A<T>::B {   // C2687
};
/*
// uncomment this class and delete other code in this sample to resolve
template <class T>
struct A {
        struct B {
        };
};
*/

void main() {
}