使用std::sort遇到难题
好的，首先，这是我的成员函数,这个成员函数可以取代oprater> 重载，会读取到许多private变量
bool smsOP::time_compare(const sms_elem & p1,const sms_elem & p2)
{
date d1,d2;

d1 = processTime(p1);
d2 = processTime(p2);

if (d1.year > d2.year)
return true;
else
if (d1.month > d2.month)
return true;
else
if (d1.day > d2.day)
return true;
else
if (d1.hour > d2.hour)
return true;
else
if (d1.min > d2.min)
return true;
else
if (d1.sec > d2.sec)
return true;
else
return false;
}
好的，这个函数通过测试。我在另外一个函数中调用，比如，这样调用
sort(read_in.begin(),read_in.end(),time_compare);
好，立马编译报错:
j:\md\visual studio 2005\projects\smswork\smswork\smsop.cpp(122) : error C3867: 'smsOP::time_compare ': function call missing argument list; use '&smsOP::time_compare ' to create a pointer to member
j:\md\visual studio 2005\projects\smswork\smswork\smsop.cpp(122) : error C2780: 'void std::sort(_RanIt,_RanIt) ' : expects 2 arguments - 3 provided
d:\program files\microsoft visual studio 8\vc\include\algorithm(3109) : see declaration of 'std::sort '

好的，改，改成这个这个样子:
sort(read_in.begin(),read_in.end(),&smsOP::time_compare);

继续报错:
d:\program files\microsoft visual studio 8\vc\include\algorithm(3181) : error C2064: term does not evaluate to a function taking 2 arguments
d:\program files\microsoft visual studio 8\vc\include\algorithm(3237) : see reference to function template instantiation 'std::pair <_Ty1,_Ty2> std::_Unguarded_partition <_RanIt,_Pr> (_RanIt,_RanIt,_Pr) ' being compiled
with
[
_Ty1=std::_Vector_iterator <sms_elem,std::allocator <sms_elem> > ,
_Ty2=std::_Vector_iterator <sms_elem,std::allocator <sms_elem> > ,
_RanIt=std::_Vector_iterator <sms_elem,std::allocator <sms_elem> > ,
_Pr=bool (__thiscall smsOP::* )(const sms_elem &,const sms_elem &)
]
d:\program files\microsoft visual studio 8\vc\include\algorithm(3261) : see reference to function template instantiation 'void std::_Sort <std::_Vector_iterator <_Ty,_Alloc> ,__w64 int,_Pr> (_RanIt,_RanIt,_Diff,_Pr) ' being compiled

with
[
_Ty=sms_elem,
_Alloc=std::allocator <sms_elem> ,
_Pr=bool (__thiscall smsOP::* )(const sms_elem &,const sms_elem &),
_RanIt=std::_Vector_iterator <sms_elem,std::allocator <sms_elem> > ,
_Diff=__w64 int
]
j:\md\visual studio 2005\projects\smswork\smswork\smsop.cpp(122) : see reference to function template instantiation 'void std::sort <std::_Vector_iterator <_Ty,_Alloc> ,bool(__thiscall smsOP::* )(const sms_elem &,const sms_elem &)> (_RanIt,_RanIt,_Pr) ' being compiled
with
[
_Ty=sms_elem,
_Alloc=std::allocator <sms_elem> ,
_RanIt=std::_Vector_iterator <sms_elem,std::allocator <sms_elem> > ,
_Pr=bool (__thiscall smsOP::* )(const sms_elem &,const sms_elem &)
]
d:\program files\microsoft visual studio 8\vc\include\algorithm(3181) : fatal error C1903: unable to recover from previous error(s); stopping compilation

好了，太多了，不知道怎么解决，希望大家帮帮忙。

[解决办法]
#include <iostream>
#include <vector>
#include <algorithm>
#include <iterator>
#include <sstream>
#include <functional>
using namespace std;
class Test
{
public:
Test():year(0),month(0){}
Test(const int &y,const int &m):year(y),month(m){}
Test(const pair <int,int> &ympair):\
year(ympair.first),month(ympair.second){}
inline
bool operator <(const Test &T)const
{
if(year <T.year)return true;
else if(year> T.year)return false;
else return month <T.month;
}
inline
operator string()
{
stringstream ss;
ss < <year < < "年 " < <month < < "月\n ";
return ss.str();
}
private:
int year;
int month;
};
int main()
{
vector <Test> T_vec;


T_vec.push_back(make_pair(1997,7));
T_vec.push_back(make_pair(1998,12));
T_vec.push_back(make_pair(1996,11));

T_vec.push_back(make_pair(1997,8));

copy(T_vec.begin(),T_vec.end(),ostream_iterator <string> (cout));

sort(T_vec.begin(),T_vec.end());

cout < < "after sorted... " < <endl;

copy(T_vec.begin(),T_vec.end(),ostream_iterator <string> (cout));

system( "PAUSE ");

return 0;


}