View Compilation Error

0_0_29327786_18135.cpp: In member function 'int SPFA<Int>::ford(int, int)':
0_0_29327786_18135.cpp:128:20: error: parse error in template argument list
    if (state[dest].prev < 0) break;
                    ^
0_0_29327786_18135.cpp: In instantiation of 'int SPFA<Int>::ford(int, int) [with Int = int]':
0_0_29327786_18135.cpp:223:31:   required from here
0_0_29327786_18135.cpp:128:4: error: 'prev' is not a member template function
    if (state[dest].prev < 0) break;
    ^