View Compilation Error

746043_0_0_2641.cpp
746043_0_0_2641.cpp(13) : error C2664: “std::basic_istringstream<_Elem,_Traits,_Alloc>::basic_istringstream(std::_Iosb<_Dummy>::openmode)” : 不能将参数 1 从“mat”转换为“std::_Iosb<_Dummy>::openmode”
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>,
            _Alloc=std::allocator<char>,
            _Dummy=int
        ]
        and
        [
            _Dummy=int
        ]
        没有可用于执行该转换的用户定义的转换运算符，或者无法调用该运算符