View Compilation Error

1_556_2627_9487.cpp:25: error: expected `}' at end of input
1_556_2627_9487.cpp: In member function `int& Integer::operator()()':
1_556_2627_9487.cpp:25: error: `ret' undeclared (first use this function)
1_556_2627_9487.cpp:25: error: (Each undeclared identifier is reported only once for each function it appears in.)
1_556_2627_9487.cpp:25: error: expected `;' at end of input
1_556_2627_9487.cpp:25: error: expected `}' at end of input
1_556_2627_9487.cpp: At global scope:
1_556_2627_9487.cpp:25: error: expected unqualified-id at end of input
1_556_2627_9487.cpp:25: error: expected `,' or `;' at end of input