Template member functions for template classes in C + + are defined outside the class

Because a lot of books do not talk about this situation, there was this problem but there is no answer, so I always thought template class template member function can only be defined within the class, until I see in some open source code originally to add two template<> ... (T_T)

Template<typename t1>class  myobjectt{public:    template<typename t2>    void  Foo (T2 v);}; Template<typename t1>template<typename t2>void myobjectt<t1>:: Foo ( T2 v) {    "Foo ("")" <<   Endl;}

Template member functions for template classes in

C + + are defined outside the class