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AnswerRe: Utterly lost about ETW. Pin
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Questionpopup menus Pin
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QuestionA very hard question? friend function again! Pin
wanchao5078-Nov-09 3:48
wanchao5078-Nov-09 3:48 
/* Visual Studio 2008
Vector is a template class,and there is a class iterator in Vector;
I declare the function operator== as the iterator's friend function
(according to C++Primer,we'd better declare operator== as a friend function)
then how to do that? how to write the friend function operator== ?
the compiler can not deduce T,help me please!

I am a Chinese student,my English is not very good,I hope
you can understand me! ^-^
*/
#include<iostream>
using namespace std;
template<typename T> class Vector;
template<typename T> bool operator==(typename Vector<T>::iterator it1,typename Vector<T>::iterator it2);
template<typename T> class Vector
{
public:
class iterator
{
friend bool operator==(typename Vector<T>::iterator it1,typename Vector<T>::iterator it2);

};
};
template<typename T> bool operator==(typename Vector<T>::iterator it1,typename Vector<T>::iterator it2)
{
return true;
}
int main()
{
Vector<int>::iterator it1,it2;
//cout<<(it1==it2)<<endl;//failed,can not deduce the T,why? help me!
cout<<operator==<int>(it1,it2)<<endl;//success,but not very useful
return 0;
}
AnswerRe: A very hard question? friend function again! Pin
CPallini8-Nov-09 6:13
mveCPallini8-Nov-09 6:13 
AnswerRe: A very hard question? friend function again! Pin
N a v a n e e t h8-Nov-09 7:07
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GeneralRe: A very hard question? friend function again! Pin
wanchao5078-Nov-09 17:29
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GeneralRe: A very hard question? friend function again! Pin
N a v a n e e t h8-Nov-09 20:37
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AnswerRe: A very hard question? friend function again! Pin
wanchao5078-Nov-09 17:10
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QuestionStatic variable Pin
kumar sanghvi8-Nov-09 2:39
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AnswerRe: Static variable Pin
Richard MacCutchan8-Nov-09 3:13
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QuestionWeird situation with WinSock Pin
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David Crow9-Nov-09 4:20
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Questionwin32 prog Pin
himmi20097-Nov-09 17:40
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AnswerRe: win32 prog Pin
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