Question

任何人都可以告诉我为什么我在编译时编写的下面一段代码一直在抱怨istream_iterator is not a member of std你能告诉我吗？谢谢你们

#include <cstdlib>
#include <stdio.h>
#include <stdlib.h>
#include <iostream>
#include <string.h>
#include <vector>
#include <fstream>
//#include<sstream>

struct field_reader: std::ctype<char> {

    field_reader(): std::ctype<char>(get_table()) {}

    static std::ctype_base::mask const* get_table() {
        static std::vector<std::ctype_base::mask>
            rc(table_size, std::ctype_base::mask());

        rc[';'] = std::ctype_base::space;
        return &rc[0];
    }
};


struct Stud{
    double VehicleID;
    double FinancialYear;
    double VehicleType;
    double Manufacturer;
    double ConditionScore;


    friend std::istream &operator>>(std::istream &is, Stud &s) {
        return is >> s.VehicleID >> s.FinancialYear >> s.VehicleType >>      s.Manufacturer >> s.ConditionScore;
    }

    // we'll also add an operator<< to support printing these out:
    friend std::ostream &operator<<(std::ostream &os, Stud const &s) {
        return os << s.VehicleID  << "\t"
                  << s.FinancialYear << "\t"
                  << s.VehicleType    << "\t"
                  << s.Manufacturer   << "\t"
                  << s.ConditionScore;
    }
};

int main(){
// Open the file:
std::ifstream in("VehicleData_cs2v_1.csv");

// Use the ctype facet we defined above to classify `;` as white-space:
in.imbue(std::locale(std::locale(), new field_reader));

// read all the data into the vector:
std::vector<Stud> studs{(std::istream_iterator<Stud>(in)),
 std::istream_iterator<Stud>()};

// show what we read:
for (auto s : studs)
    std::cout << s << "\n";
}

所以，如果您发现问题，请告诉我，因为我现在还不能说清楚，我相信我已经填写了所有必要的包含库

Answer 1

错误消息可能听起来有点误导，但这是编译器可以说的最好的事情。 std::istream_iterator头文件中声明<iterator>，这是导致您出现问题的原因。

只需将其添加到您的包含

即可

#include <iterator>

C ++ istream_iterator不是std的成员

1 个答案: