View Compilation Error

0_0_21660422_1277.cpp:23:20: error: 'scan_d' declared as an 'inline' variable
 inline bool scan_d(T &ret){char c;int sgn;if (c = getchar(), c == EOF){return 0;}
                    ^
0_0_21660422_1277.cpp:23:20: error: 'T' was not declared in this scope
0_0_21660422_1277.cpp:23:23: error: 'ret' was not declared in this scope
 inline bool scan_d(T &ret){char c;int sgn;if (c = getchar(), c == EOF){return 0;}
                       ^
0_0_21660422_1277.cpp:23:27: error: expected ',' or ';' before '{' token
 inline bool scan_d(T &ret){char c;int sgn;if (c = getchar(), c == EOF){return 0;}
                           ^