View Compilation Error

0_0_36369956_32757.cpp:11:27: error: 'operator[]' function uses 'auto' type specifier without trailing return type
     auto *operator[](int i) {
                           ^
0_0_36369956_32757.cpp:11:27: note: deduced return type only available with -std=c++1y or -std=gnu++1y
0_0_36369956_32757.cpp:34:27: error: 'operator[]' function uses 'auto' type specifier without trailing return type
     auto &operator[](int i) {
                           ^
0_0_36369956_32757.cpp:34:27: note: deduced return type only available with -std=c++1y or -std=gnu++1y