Thread: Errors related with <set>

it's simple code, but I got errors.

insert

Code:

#include <stdio.h>
#include <set>

struct mytemp
{
	int a;
	int b;
};

void main(){

	typedef std::set < mytemp > mSet;
	mSet pool;

	mytemp T;
	T.a=1;
	T.b=1;

	pool.insert(T);
	
	printf("%d\n",pool.end());

}

I got the following error messages after compilation with VC++6.0

insert

Code:

Compiling...
Test1.cpp
c:\program files\microsoft visual studio\vc98\include\functional(86) : error C2784: 'bool __cdecl std::operator <(const class std::multiset<_K,_Pr,_A> &,const class std::multiset<_K,_Pr,_A> &)' : could not deduce template argument for 'const class s
td::multiset<_K,_Pr,_A> &' from 'const struct mytemp'
        c:\program files\microsoft visual studio\vc98\include\functional(86) : while compiling class-template member function 'bool __thiscall std::less<struct mytemp>::operator ()(const struct mytemp &,const struct mytemp &) const'
c:\program files\microsoft visual studio\vc98\include\functional(86) : error C2784: 'bool __cdecl std::operator <(const class std::set<_K,_Pr,_A> &,const class std::set<_K,_Pr,_A> &)' : could not deduce template argument for 'const class std::set<_K
,_Pr,_A> &' from 'const struct mytemp'
        c:\program files\microsoft visual studio\vc98\include\functional(86) : while compiling class-template member function 'bool __thiscall std::less<struct mytemp>::operator ()(const struct mytemp &,const struct mytemp &) const'
c:\program files\microsoft visual studio\vc98\include\functional(86) : error C2784: 'bool __cdecl std::operator <(const class std::_Tree<_K,_Ty,_Kfn,_Pr,_A> &,const class std::_Tree<_K,_Ty,_Kfn,_Pr,_A> &)' : could not deduce template argument for 'c
onst class std::_Tree<_K,_Ty,_Kfn,_Pr,_A> &' from 'const struct mytemp'
        c:\program files\microsoft visual studio\vc98\include\functional(86) : while compiling class-template member function 'bool __thiscall std::less<struct mytemp>::operator ()(const struct mytemp &,const struct mytemp &) const'
c:\program files\microsoft visual studio\vc98\include\functional(86) : error C2784: 'bool __cdecl std::operator <(const class std::reverse_iterator<_RI,_Ty,_Rt,_Pt,_D> &,const class std::reverse_iterator<_RI,_Ty,_Rt,_Pt,_D> &)' : could not deduce te
mplate argument for 'const class std::reverse_iterator<_RI,_Ty,_Rt,_Pt,_D> &' from 'const struct mytemp'
        c:\program files\microsoft visual studio\vc98\include\functional(86) : while compiling class-template member function 'bool __thiscall std::less<struct mytemp>::operator ()(const struct mytemp &,const struct mytemp &) const'
c:\program files\microsoft visual studio\vc98\include\functional(86) : error C2784: 'bool __cdecl std::operator <(const struct std::pair<_T1,_T2> &,const struct std::pair<_T1,_T2> &)' : could not deduce template argument for 'const struct std::pair<
_T1,_T2> &' from 'const struct mytemp'
        c:\program files\microsoft visual studio\vc98\include\functional(86) : while compiling class-template member function 'bool __thiscall std::less<struct mytemp>::operator ()(const struct mytemp &,const struct mytemp &) const'
c:\program files\microsoft visual studio\vc98\include\functional(86) : error C2676: binary '<' : 'const struct mytemp' does not define this operator or a conversion to a type acceptable to the predefined operator
        c:\program files\microsoft visual studio\vc98\include\functional(86) : while compiling class-template member function 'bool __thiscall std::less<struct mytemp>::operator ()(const struct mytemp &,const struct mytemp &) const'
Error executing cl.exe.

Test1.exe - 6 error(s), 0 warning(s)

Does anyone know why this happens?

Ok, this problem is settled, a redefination of the operator '<' in the struct mytemp
will work.