STL and the SDK

From:
"NG" <nbgomez@gmail.com>
Newsgroups:
microsoft.public.vc.language
Date:
3 Feb 2007 07:42:38 -0800
Message-ID:
<1170517358.323705.243050@h3g2000cwc.googlegroups.com>
I recently installed the 2003 Server SDK and the Visual Studio 2005 C+
+ Express Edition. I tried to compile some STL code and I got
unanticipated errors. The code is below and it's fairly simple, I
define a simple test object class and a comparison functor. I then
create a vector of test objects and look for a match using the STL
equal_range algorithm. The compilation output is also included. I
successfully compiled the code with MinGW (gcc). The other strange
thing is the code compiled with the VC 6 compiler. In my searche to
find the error, I found a message that said the types for the
operator() in the functor must be the same. This does compile if
changed, but doesn't seem right considering that there are different
template types for the two parameters. Any help would be greatly
appreciated.

/**************Code
#include "stdafx.h"
#include <functional>
#include <algorithm>
#include <vector>

using namespace std;
class TestOb
{
public:
    TestOb( int iMemInit ):m_iMem(iMemInit){}
    TestOb( const TestOb & object ):m_iMem(object.m_iMem){}

    TestOb& operator=( const TestOb & object ){
        m_iMem = object.m_iMem;
        return *this;
    }

    int GetInt(){
        return m_iMem;
    }
private:
    int m_iMem;
};

class OB_COMP : public binary_function<int,TestOb,bool>
{
public:
    bool operator()(int iTest, TestOb& rOb){
        return iTest<rOb.GetInt();
    }
    bool operator()(TestOb& rOb, int iTest){
        return iTest<rOb.GetInt();
    }
};
int _tmain(int argc, _TCHAR* argv[])
{
    vector<TestOb> vObjects;
    vObjects.push_back( TestOb(1) );
    vObjects.push_back( TestOb(2) );
    vObjects.push_back( TestOb(3) );

    pair<vector<TestOb>::iterator,vector<TestOb>::iterator> prSearch =
equal_range( vObjects.begin(),vObjects.end(),2, OB_COMP() );
    return 0;
}

/**************End Code

/*************Compile output1>Compiling...
1>STLTest.cpp
1>f:\program files\microsoft visual studio 8\vc\include
\xutility(323) : error C2664: 'bool OB_COMP::operator ()(const TestOb
&,const int &)' : cannot convert parameter 2 from 'TestOb' to 'const
int &'
1> Reason: cannot convert from 'TestOb' to 'const int'
1> No user-defined-conversion operator available that can
perform this conversion, or the operator cannot be called
1> f:\program files\microsoft visual studio 8\vc\include
\xutility(1507) : see reference to function template instantiation
'bool std::_Debug_lt_pred<_Pr,TestOb,TestOb>(_Pr,_Ty1 &,_Ty2 &,const
wchar_t *,unsigned int)' being compiled
1> with
1> [
1> _Pr=OB_COMP,
1> _Ty1=TestOb,
1> _Ty2=TestOb
1> ]
1> f:\program files\microsoft visual studio 8\vc\include
\xutility(1517) : see reference to function template instantiation
'void
std::_Debug_order_single2<_InIt,_Pr>(_FwdIt,_FwdIt,_Pr,bool,const
wchar_t *,unsigned int,std::forward_iterator_tag)' being compiled
1> with
1> [
1>
_InIt=std::_Vector_iterator<TestOb,std::allocator<TestOb>>,
1> _Pr=OB_COMP,
1>
_FwdIt=std::_Vector_iterator<TestOb,std::allocator<TestOb>>
1> ]
1> f:\program files\microsoft visual studio 8\vc\include
\algorithm(2448) : see reference to function template instantiation
'void std::_Debug_order_single<_FwdIt,_Pr>(_InIt,_InIt,_Pr,bool,const
wchar_t *,unsigned int)' being compiled
1> with
1> [
1>
_FwdIt=std::_Vector_iterator<TestOb,std::allocator<TestOb>>,
1> _Pr=OB_COMP,
1>
_InIt=std::_Vector_iterator<TestOb,std::allocator<TestOb>>
1> ]
1> f:\program files\microsoft visual studio 8\vc\include
\algorithm(2484) : see reference to function template instantiation
'std::pair<_Ty1,_Ty2> std::_Equal_range<_FwdIt,_Ty,__w64
int,_Pr>(_FwdIt,_FwdIt,const _Ty &,_Pr,_Diff *)' being compiled
1> with
1> [
1>
_Ty1=std::_Vector_iterator<TestOb,std::allocator<TestOb>>,
1>
_Ty2=std::_Vector_iterator<TestOb,std::allocator<TestOb>>,
1>
_FwdIt=std::_Vector_iterator<TestOb,std::allocator<TestOb>>,
1> _Ty=int,
1> _Pr=OB_COMP,
1> _Diff=__w64 int
1> ]
1> d:\softwaredevelopment\stltest\stltest\stltest
\stltest.cpp(46) : see reference to function template instantiation
'std::pair<_Ty1,_Ty2>
std::equal_range<std::_Vector_iterator<_Ty,_Alloc>,int,OB_COMP>(_FwdIt,_FwdIt,const
int &,_Pr)' being compiled
1> with
1> [
1>
_Ty1=std::_Vector_iterator<TestOb,std::allocator<TestOb>>,
1>
_Ty2=std::_Vector_iterator<TestOb,std::allocator<TestOb>>,
1> _Ty=TestOb,
1> _Alloc=std::allocator<TestOb>,
1>
_FwdIt=std::_Vector_iterator<TestOb,std::allocator<TestOb>>,
1> _Pr=OB_COMP
1> ]
1>f:\program files\microsoft visual studio 8\vc\include
\xutility(325) : error C2664: 'bool OB_COMP::operator ()(const TestOb
&,const int &)' : cannot convert parameter 2 from 'TestOb' to 'const
int &'
1> Reason: cannot convert from 'TestOb' to 'const int'
1> No user-defined-conversion operator available that can
perform this conversion, or the operator cannot be called
/*************End compile output

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