View Compilation Error

0_0_13039252_19066.cpp: In function `void insert()':
0_0_13039252_19066.cpp:43: error: invalid token
0_0_13039252_19066.cpp:43: error: non-lvalue in unary `&'
0_0_13039252_19066.cpp:43: error: `A' undeclared (first use this function)
0_0_13039252_19066.cpp:43: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_13039252_19066.cpp:43: error: invalid token