运载符重载的例子--但不知问题出在哪里
今天学习C++看到了运载符重载，对这个的概念不是很理解，就按照书上的例子写了个代码，但是不能运行。以下是错误提示：d:\program files\microsoft visual studio 10.0\练习项目文件夹\phonenumber\phonenumber\phonenumber1.cpp(15): error C2248: “PhoneNumber::areaCode”: 无法访问 private 成员(在“PhoneNumber”类中声明)
1> d:\program files\microsoft visual studio 10.0\练习项目文件夹\phonenumber\phonenumber\phonenumber.h(16) : 参见“PhoneNumber::areaCode”的声明
1> d:\program files\microsoft visual studio 10.0\练习项目文件夹\phonenumber\phonenumber\phonenumber.h(12) : 参见“PhoneNumber”的声明
1>d:\program files\microsoft visual studio 10.0\练习项目文件夹\phonenumber\phonenumber\phonenumber1.cpp(17): error C2248: “PhoneNumber::exchange”: 无法访问 private 成员(在“PhoneNumber”类中声明)
1> d:\program files\microsoft visual studio 10.0\练习项目文件夹\phonenumber\phonenumber\phonenumber.h(17) : 参见“PhoneNumber::exchange”的声明
1> d:\program files\microsoft visual studio 10.0\练习项目文件夹\phonenumber\phonenumber\phonenumber.h(12) : 参见“PhoneNumber”的声明
1>d:\program files\microsoft visual studio 10.0\练习项目文件夹\phonenumber\phonenumber\phonenumber1.cpp(19): error C2248: “PhoneNumber::line”: 无法访问 private 成员(在“PhoneNumber”类中声明)
1> d:\program files\microsoft visual studio 10.0\练习项目文件夹\phonenumber\phonenumber\phonenumber.h(18) : 参见“PhoneNumber::line”的声明
1> d:\program files\microsoft visual studio 10.0\练习项目文件夹\phonenumber\phonenumber\phonenumber.h(12) : 参见“PhoneNumber”的声明
1> PhoneNumber.cpp
1>d:\program files\microsoft visual studio 10.0\练习项目文件夹\phonenumber\phonenumber\phonenumber.cpp(12): error C2678: 二进制“>>”: 没有找到接受“std::istream”类型的左操作数的运算符(或没有可接受的转换)
1> d:\program files\microsoft visual studio 10.0\vc\include\istream(1053): 可能是“std::basic_istream<_Elem,_Traits> &std::operator >><std::char_traits<char>>(std::basic_istream<_Elem,_Traits> &&,signed char *)”
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> d:\program files\microsoft visual studio 10.0\vc\include\istream(1060): 或 “std::basic_istream<_Elem,_Traits> &std::operator >><std::char_traits<char>>(std::basic_istream<_Elem,_Traits> &&,signed char &)”
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> d:\program files\microsoft visual studio 10.0\vc\include\istream(1067): 或 “std::basic_istream<_Elem,_Traits> &std::operator >><std::char_traits<char>>(std::basic_istream<_Elem,_Traits> &&,unsigned char *)”
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> d:\program files\microsoft visual studio 10.0\vc\include\istream(1074): 或 “std::basic_istream<_Elem,_Traits> &std::operator >><std::char_traits<char>>(std::basic_istream<_Elem,_Traits> &&,unsigned char &)”
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> d:\program files\microsoft visual studio 10.0\vc\include\istream(1097): 或 “std::basic_istream<_Elem,_Traits> &std::operator >><std::char_traits<char>>(std::basic_istream<_Elem,_Traits> &,signed char *)”
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> d:\program files\microsoft visual studio 10.0\vc\include\istream(1104): 或 “std::basic_istream<_Elem,_Traits> &std::operator >><std::char_traits<char>>(std::basic_istream<_Elem,_Traits> &,signed char &)”
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> d:\program files\microsoft visual studio 10.0\vc\include\istream(1111): 或 “std::basic_istream<_Elem,_Traits> &std::operator >><std::char_traits<char>>(std::basic_istream<_Elem,_Traits> &,unsigned char *)”
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> d:\program files\microsoft visual studio 10.0\vc\include\istream(1118): 或 “std::basic_istream<_Elem,_Traits> &std::operator >><std::char_traits<char>>(std::basic_istream<_Elem,_Traits> &,unsigned char &)”
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> d:\program files\microsoft visual studio 10.0\vc\include\istream(1128): 或 “std::basic_istream<_Elem,_Traits> &std::operator >><char,std::char_traits<char>,PhoneNumber>(std::basic_istream<_Elem,_Traits> &&,_Ty &)”
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>,
1> _Ty=PhoneNumber
1> ]
1> d:\program files\microsoft visual studio 10.0\vc\include\istream(179): 或 “std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(std::basic_istream<_Elem,_Traits> &(__cdecl *)(std::basic_istream<_Elem,_Traits> &))”
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> d:\program files\microsoft visual studio 10.0\vc\include\istream(185): 或 “std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(std::basic_ios<_Elem,_Traits> &(__cdecl *)(std::basic_ios<_Elem,_Traits> &))”
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> d:\program files\microsoft visual studio 10.0\vc\include\istream(192): 或 “std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(std::ios_base &(__cdecl *)(std::ios_base &))”
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> d:\program files\microsoft visual studio 10.0\vc\include\istream(199): 或 “std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(std::_Bool &)”
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> d:\program files\microsoft visual studio 10.0\vc\include\istream(218): 或 “std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(short &)”
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> d:\program files\microsoft visual studio 10.0\vc\include\istream(253): 或 “std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(unsigned short &)”
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> d:\program files\microsoft visual studio 10.0\vc\include\istream(272): 或 “std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(int &)”
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> d:\program files\microsoft visual studio 10.0\vc\include\istream(298): 或 “std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(unsigned int &)”
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> d:\program files\microsoft visual studio 10.0\vc\include\istream(316): 或 “std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(long &)”
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> d:\program files\microsoft visual studio 10.0\vc\include\istream(334): 或 “std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(unsigned long &)”
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> d:\program files\microsoft visual studio 10.0\vc\include\istream(354): 或 “std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(__int64 &)”
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> d:\program files\microsoft visual studio 10.0\vc\include\istream(373): 或 “std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(unsigned __int64 &)”
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> d:\program files\microsoft visual studio 10.0\vc\include\istream(392): 或 “std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(float &)”
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> d:\program files\microsoft visual studio 10.0\vc\include\istream(411): 或 “std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(double &)”
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> d:\program files\microsoft visual studio 10.0\vc\include\istream(429): 或 “std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(long double &)”
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> d:\program files\microsoft visual studio 10.0\vc\include\istream(447): 或 “std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(void *&)”
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> d:\program files\microsoft visual studio 10.0\vc\include\istream(466): 或 “std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator >>(std::basic_streambuf<_Elem,_Traits> *)”
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> 尝试匹配参数列表“(std::istream, PhoneNumber)”时
1> 正在生成代码...
1>
1>生成失败。
头文件代码如下：
#ifndef PHONENUMBER_H
#define PHONENUMBER_H
#include <iostream>
using std::ostream;
using std::istream;
#include <string>
using std::string;
class PhoneNumber
{
friend ostream &operator<<( ostream &, const PhoneNumber & );
friend istream &operator<<( istream &, PhoneNumber & );
private:
string areaCode;
string exchange;
string line;
};
#endif
成员函数代码如下：
#include <iomanip>
using std::setw;
#include "PhoneNumber.h"
ostream &operator<<( ostream &output, const PhoneNumber &number )
{
output << "(" << number.areaCode << ")" << number.exchange << "-" << number.line;
return output;
}
istream &operator>>( istream &input, PhoneNumber &number )
{
input.ignore();
input >> setw( 3 ) >> number.areaCode;
input.ignore( 2 );
input >> setw( 3 ) >> number.exchange;
input.ignore();
input >> setw( 4 ) >> number.line;
return input;
}
源文件代码如下：
#include <iostream>
using namespace std;
#include "PhoneNumber.h"
int main()
{
PhoneNumber phone;
cout << "Enter phone number in the form (123) 456-7890:" << endl;
cin >> phone;
cout << "The phone number entered was: ";
cout << phone << endl;
return 0;
}
请大侠帮我看看是哪个地方我弄错了，我找了几遍没找到……
