View difference between Paste ID: AvTgRdTx and Dh3jBbxb

 template <typename Type>
 class Outer
     {
         public:
             template <typename InType>
             class Inner
             {
                 public:
                     template <typename X>
                     void nested();
             };
     };
 
 
 
 
 надо написать
 template <typename T1, typename T2>
 class Usage
     {
         public:
             void caller(Outer<T1>::Inner<T2> &obj)
 { вызов obj. nested<int>(); }
     };