写了个文件输出类报错

[JPF1024]

不知道为什么就报错了，求解答。

头文件：

#ifndef TEST822_H
#define TEST822_H


class Test822
{
    public:
        Test822();
        int reads(std::iostream &is,std::ofstream &os);
        void out(std::ifstream &ins);
    protected:
    private:
};

#endif // TEST822_H

实现:

#include "Test822.h"
#include<iostream>
#include<fstream>

int Test822::reads(istream &is,ofstream &os)
{
    string pos ;
    is >> pos ;
    os << pos ;
    return 0;
}

Test822::out(ifstream &kis)
{
    string pos;
    while(kis >> pos)
    {
        cout << pos << endl;
    }
    
}

main方法:

#include <iostream>
#include<fstream>
//#include"Test822.cpp"
#include"Test822.h"
using namespace std;

int main()
{
    ofstream iks("F:\\test.txt");
    Test822 test;
    test.reads(cin,iks);
    cout << "输出." << endl;
    iks.close();
    ifstream ins("F:\\test.txt");
    test.out(ins);
    ins.close();
    return 0;
}

编译记录:

-------------- Build: Debug in 822Out (compiler: GNU GCC Compiler)---------------

mingw32-g++.exe -Wall -fexceptions -g -std=c++0x -Iinclude -c main.cpp -o obj\Debug\main.o
main.cpp: In function 'int main()':
main.cpp:11:23: error: no matching function for call to 'Test822::reads(std::istream&, std::ofstream&)'
     test.reads(cin,iks);
                       ^
main.cpp:11:23: note: candidate is:
In file included from main.cpp:4:0:
include/Test822.h:9:13: note: int Test822::reads(std::iostream&, std::ofstream&)
         int reads(std::iostream &is,std::ofstream &os);
             ^
include/Test822.h:9:13: note:   no known conversion for argument 1 from 'std::istream {aka std::basic_istream<char>}' to 'std::iostream& {aka std::basic_iostream<char>&}'
Process terminated with status 1 (0 minute(s), 0 second(s))
1 error(s), 0 warning(s) (0 minute(s), 0 second(s))

刚学没多久，对C++的类很迷茫，求指点迷津，谢谢

[JPF1024]

引用 1 楼 mougaidong 的回复:

至少有一个我问题是： cpp 文件中没有 using namespace std;

修改了还是报错，说类找不到

[turing-complete]

至少有一个我问题是： cpp 文件中没有 using namespace std;

[sysphius]

头文件里面没有#include<iostream>，所以默默地报错了，系统找不到你要用的IO对象。