View Compilation Error

0_0_1480009_9806.cpp
0_0_1480009_9806.cpp(4) : error C2552: “ss” : 不能用初始值设定项列表初始化非聚合
        “std::basic_string<_Elem,_Traits,_Ax>” : 不聚合带基的类型
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>,
            _Ax=std::allocator<char>
        ]