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template<int src, int dst>
struct move_disc
{
    // member access will print src and dst
};
 
template<int n, int src, int tmp, int dst>
struct hanoi
{
    hanoi<n-1, src, dst, tmp> before;
    typename move_disc<src, dst>::lol disc;
    hanoi<n-1, tmp, src, dst> after;
};
 
template<int src, int tmp, int dst>
struct hanoi<0, src, tmp, dst>
{
    // recursive base case
};
 
hanoi<3, 1, 2, 3> go;
 

prog.cpp: In instantiation of ‘struct hanoi<1, 1, 2, 3>’:
prog.cpp:10:31:   recursively required from ‘struct hanoi<2, 1, 3, 2>’
prog.cpp:10:31:   required from ‘struct hanoi<3, 1, 2, 3>’
prog.cpp:21:19:   required from here
prog.cpp:11:39: error: no type named ‘lol’ in ‘struct move_disc<1, 3>’
     typename move_disc<src, dst>::lol disc;
                                       ^
prog.cpp: In instantiation of ‘struct hanoi<2, 1, 3, 2>’:
prog.cpp:10:31:   required from ‘struct hanoi<3, 1, 2, 3>’
prog.cpp:21:19:   required from here
prog.cpp:11:39: error: no type named ‘lol’ in ‘struct move_disc<1, 2>’
prog.cpp: In instantiation of ‘struct hanoi<1, 3, 1, 2>’:
prog.cpp:12:31:   required from ‘struct hanoi<2, 1, 3, 2>’
prog.cpp:10:31:   required from ‘struct hanoi<3, 1, 2, 3>’
prog.cpp:21:19:   required from here
prog.cpp:11:39: error: no type named ‘lol’ in ‘struct move_disc<3, 2>’
prog.cpp: In instantiation of ‘struct hanoi<3, 1, 2, 3>’:
prog.cpp:21:19:   required from here
prog.cpp:11:39: error: no type named ‘lol’ in ‘struct move_disc<1, 3>’
prog.cpp: In instantiation of ‘struct hanoi<1, 2, 3, 1>’:
prog.cpp:10:31:   required from ‘struct hanoi<2, 2, 1, 3>’
prog.cpp:12:31:   required from ‘struct hanoi<3, 1, 2, 3>’
prog.cpp:21:19:   required from here
prog.cpp:11:39: error: no type named ‘lol’ in ‘struct move_disc<2, 1>’
prog.cpp: In instantiation of ‘struct hanoi<2, 2, 1, 3>’:
prog.cpp:12:31:   required from ‘struct hanoi<3, 1, 2, 3>’
prog.cpp:21:19:   required from here
prog.cpp:11:39: error: no type named ‘lol’ in ‘struct move_disc<2, 3>’

Standard output is empty