根据要求，实际档案：
d_date.h http://pastebin.com/AFe4XE2c
d_except.h http://pastebin.com/8QE2m8ia
d_date.cpp http://pastebin.com/dgpxLWKv
input.dat http://pastebin.com/XUpRcu9E
我做了一个类似于下面的裸骨程序，我也遇到了类似的错误。
CLASS：
#ifndef DATE_CLASS
#define DATE_CLASS
#include <iostream>
#include <iomanip>
#include <string>
//#include "d_except.h"
using namespace std;
class date
{
public:
date ();
//ADDED
friend ostream& operator<<(ostream&, const date&);
friend istream& operator>>(istream&, date&);
private:
int month, day, year;
// private members that specify the date
};
#endif
AND DATE.CPP：
#ifndef DATE_CPP
#define DATE_CPP
#include "date.h"
#include <stdexcept>
#include <iostream>
using namespace std;
ostream& operator<<(ostream& ostr, const date& date1){
char blah;
ostr << blah;
}
istream& operator>>(istream& istr, date& date1){
istr >> "5";
return istr;
}
#endif
DRIVER.CPP：
#include <iostream>
#include "date.h"
//#include "d_except.h"
using namespace std;
void main (void)
{
date date1;
date date2;
}
和错误（不是发布长度列表，而是发布到最后的列表：
c:\program files (x86)\microsoft visual studio 10.0\vc\include\istream(373): or '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> c:\program files (x86)\microsoft visual studio 10.0\vc\include\istream(392): or '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> c:\program files (x86)\microsoft visual studio 10.0\vc\include\istream(411): or '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> c:\program files (x86)\microsoft visual studio 10.0\vc\include\istream(429): or '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> c:\program files (x86)\microsoft visual studio 10.0\vc\include\istream(447): or '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> c:\program files (x86)\microsoft visual studio 10.0\vc\include\istream(466): or '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> while trying to match the argument list '(std::istream, const char [2])'
1> Generating Code...
1>
1>Build FAILED.
LENGTHIER版本： （以下是IGNORE） 当我使用以下内容时，我会收到可怕的警告：
class date
{
public:
//irrelevant (hopefully) functions not shown are here
friend ostream& operator<<(ostream&, const date&);
friend istream& operator>>(istream&, date&);
private:
int month, day, year;
}
ostream& operator<<(ostream& ostr, const date& date1){
ostr << date1.getDay() << "/" << date1.getMonth() << "/" << date1.getYear() << " ";
return ostr;
}
istream& operator>>(istream& istr, date& date1){
int d, m, y;
char ch;
istr >> d >> ch >> m >> ch >> y >> ch;
date1.setDay(d);
date1.setMonth(m);
date1.setYear(y);
return istr;
}
我的输入是input.dat，并在Microsoft Visual Studio 2010的DeBugging页面中指定。在＆gt;＆gt;之后，我会使用不同的变量重复以下内容。我可以说，使用date的istream存在一些问题。我认为在这篇文章的最后一行“告诉我”问题是什么，但我仍然没有得到它。
c:\program files (x86)\microsoft visual studio 10.0\vc\include\istream(411): or '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> c:\program files (x86)\microsoft visual studio 10.0\vc\include\istream(429): or '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> c:\program files (x86)\microsoft visual studio 10.0\vc\include\istream(447): or '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> c:\program files (x86)\microsoft visual studio 10.0\vc\include\istream(466): or '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> while trying to match the argument list '(std::istream, date)'
运行此东西的实际.cpp是：
void main (void)
{
date date1;
date date2;
cout << "Enter date1 and date2:" << endl;
while (cin >> date1 >> date2)
{
cout << "Printing date1 and date2" << endl;
cout << date1 << endl << date2 << endl;
//and more...
}
附录：
class date
{
public:
date (int mm=1, int dd=1, int yyyy=1900);
// supply date in format MM/DD/YYYY
// preconditions: 1 <= mm <= 12,
// 1 <= dd <= daysInMonth()
void writeShortDate () const;
// output the date in the format "MM/DD/YYYY"
void writeLongDate () const;
// output the date in the format "month day, year"
void incrementDate(int ndays);
// add ndays days to the date
// precondition: 0 <= ndays <= 365
int numberOfDays() const;
// return the number of days into the year
int getMonth() const;// done
// return the month as integer value 1 to 12
int getDay() const; //done
// return day of the month
int getYear() const; //done
// return the year
void setMonth(int mm); //done
// update the month
// precondition: 1 <= mm <= 12
void setDay(int dd); //done
// update the day
// precondition: 1 <= dd <= daysInMonth()
void setYear(int yyyy); //done
// update the year
// precondition: if the date is February 29,
// yyyy must be a leap year
int daysInMonth() const;
// return number of days in the month
bool isLeapYear() const;
// is the current year a leap year (true/false)
//ADDED
bool operator< (const date&) const;
bool operator> (const date&) const;
date operator++ ();
friend ostream& operator<<(ostream&, const date&);
friend istream& operator>>(istream&, date&);
private:
enum monthName {Jan = 1, Feb, Mar, Apr, May, Jun,
Jul, Aug, Sep, Oct, Nov, Dec};
// private type used by date
int month, day, year;
// private members that specify the date
};
AND：
#ifndef DRIVER_H
#define DRIVER_H
#include <iostream>
#include "d_date.h"
#include "d_except.h"
using namespace std;
void main (void)
{
date date1;
date date2;
cout << "Enter date1 and date2:" << endl;
while (cin >> date1 >> date2)
{
cout << "Printing date1 and date2" << endl;
cout << date1 << endl << date2 << endl;
if (date1 == date2)
cout << date1 << " is equal to " << date2 << endl;
if (date1 != date2)
cout << date1 << " is not equal to " << date2 << endl;
if (date1 < date2)
cout << date1 << " is less than " << date2 << endl;
if (date1 > date2)
cout << date1 << " is greater than " << date2 << endl;
++date1;
++date2;
cout << "Increment of date1: " << date1 << endl;
cout << "Increment of date2: " << date2 << endl;
cout << endl << "---End of Run---" << endl << endl;
cout << "Enter date1 and date2:" << endl;
}
}
这是针对学校的，我讨厌发布几乎整个作业，但我无法修复错误。以上是date.h和driver.cpp的更详细版本。
我不知道我做了什么，但现在唯一的错误是：
Error 1 error C2678: binary '>>' : no operator found which takes a left-hand operand of type 'std::istream' (or there is no acceptable conversion)
另外，忘了提及......这里没有显示driver.cpp的重载代码，但没有导致错误。
答案 0 :(得分：1)
编译器告诉您operator >> trying to match the argument list '(std::istream, date)'时出现问题。实际上，在operator >>类的date重载中，您在最后一个版本的代码中有了这条指令：
istr >> "5";
通常，operator >>重载签名中的第二个参数是对应该从流中提取（反序列化）的对象的非const引用。但是，字符串文字"5"的类型为char [2]，并且该类型的operator >>不存在重载。这是有道理的：你如何从流中提取对象并将其存储到字符串文字中？
因此，你得到的错误。我怀疑您之前版本的代码受到类似问题的影响。