C2784 triggered by STL::Set insert() and find()

[Olumide]

Hello,

I've got this nice inner class that I'm holds a set of "FrontPoint"
objects as shown below. Unfortunately, the find and insert methods
trigger massive C2784 errors. Would someone please point out what I'm
doing wrong?

Many thanks,

- Olumide
//////////////////////// code ////////////////////////

struct FrontPoint
{
// stuff
};

class Cell
{
public:
double xMin , xMax, yMin, yMax , zMin , zMax;
Cell *upper , *lower , *north, *south, *east , *west;
Cell::Cell(){ upper = lower = north = south = east = west = NULL; }
set<FrontPoint frontPoint;

void addFrontPoint( FrontPoint& frontPt )
{
frontPoint.insert( frontPt ); // Triggers C2784
}

void removeFrontPoint( FrontPoint& frontPt )
{
set<FrontPoint >::iterator frontPtItx =
frontPoint.find( frontPt ); // Triggers C2784
}
};
//////////////////////// error ////////////////////////

c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\functional(139) : error C2784: 'bool std::operator <(const
std::basic_string<_Elem,_Traits,_Alloc&,const _Elem *)' : could not
deduce template argument for 'const
std::basic_string<_Elem,_Traits,_Ax&' from 'const
MarchingTriangles::FrontPoint'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\string(148) : see declaration of 'std::operator`<''
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\functional(138) : while compiling class-template member function
'bool std::less<_Ty>::operator ()(const _Ty &,const _Ty &) const'
with
[
_Ty=MarchingTriangles::FrontPoint
]
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\set(48) : see reference to class template instantiation
'std::less<_Ty>' being compiled
with
[
_Ty=MarchingTriangles::FrontPoint
]
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\xtree(23) : see reference to class template instantiation
'std::_Tset_traits<_Kty,_Pr,_Alloc,_Mfl>' being compiled
with
[
_Kty=MarchingTriangles::FrontPoint,
_Pr=std::less<MarchingTriangles::FrontPoint>,
_Alloc=std::allocator<MarchingTriangles::FrontPoin t>,
_Mfl=false
]
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\xtree(65) : see reference to class template instantiation
'std::_Tree_nod<_Traits>' being compiled
with
[

_Traits=std::_Tset_traits<MarchingTriangles::Front Point,std::less<MarchingTriangles::FrontPoint>,std ::allocator<MarchingTriangles::FrontPoint>,false>
]
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\xtree(87) : see reference to class template instantiation
'std::_Tree_ptr<_Traits>' being compiled
with
[

_Traits=std::_Tset_traits<MarchingTriangles::Front Point,std::less<MarchingTriangles::FrontPoint>,std ::allocator<MarchingTriangles::FrontPoint>,false>
]
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\xtree(105) : see reference to class template instantiation
'std::_Tree_val<_Traits>' being compiled
with
[

_Traits=std::_Tset_traits<MarchingTriangles::Front Point,std::less<MarchingTriangles::FrontPoint>,std ::allocator<MarchingTriangles::FrontPoint>,false>
]
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\set(57) : see reference to class template instantiation
'std::_Tree<_Traits>' being compiled
with
[

_Traits=std::_Tset_traits<MarchingTriangles::Front Point,std::less<MarchingTriangles::FrontPoint>,std ::allocator<MarchingTriangles::FrontPoint>,false>
]
c:\Work\Project\MuscleBuilder\MarchingTriangles.h( 72) : see
reference to class template instantiation 'std::set<_Kty>' being
compiled
with
[
_Kty=MarchingTriangles::FrontPoint
]
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\functional(139) : error C2784: 'bool std::operator <(const _Elem
*,const std::basic_string<_Elem,_Traits,_Alloc&)' : could not deduce
template argument for 'const T1 *' from 'const
MarchingTriangles::FrontPoint'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\string(138) : see declaration of 'std::operator`<''
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\functional(139) : error C2784: 'bool std::operator <(const
std::basic_string<_Elem,_Traits,_Alloc&,const
std::basic_string<_Elem,_Traits,_Alloc&)' : could not deduce
template argument for 'const std::basic_string<_Elem,_Traits,_Ax&'
from 'const MarchingTriangles::FrontPoint'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\string(128) : see declaration of 'std::operator`<''
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\functional(139) : error C2784: 'bool std::operator <(const
std::list<_Ty,_Alloc&,const std::list<_Ty,_Alloc&)' : could not
deduce template argument for 'const std::list<_Ty,_Ax&' from 'const
MarchingTriangles::FrontPoint'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\list(991) : see declaration of 'std::operator`<''
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\functional(139) : error C2784: 'bool std::operator <(const
std::_Tree<_Traits&,const std::_Tree<_Traits&)' : could not deduce
template argument for 'const std::_Tree<_Traits&' from 'const
MarchingTriangles::FrontPoint'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\xtree(1170) : see declaration of 'std::operator`<''
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\functional(139) : error C2784: 'bool std::operator <(const
std::vector<_Ty,_Alloc&,const std::vector<_Ty,_Alloc&)' : could
not deduce template argument for 'const std::vector<_Ty,_Ax&' from
'const MarchingTriangles::FrontPoint'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\vector(915) : see declaration of 'std::operator`<''
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\functional(139) : error C2784: 'bool std::operator <(const
std::reverse_iterator<_RanIt&,const std::reverse_iterator<_RanIt>
&)' : could not deduce template argument for 'const
std::reverse_iterator<_RanIt&' from 'const
MarchingTriangles::FrontPoint'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\xutility(655) : see declaration of 'std::operator`<''
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\functional(139) : error C2784: 'bool std::operator <(const
std::pair<_Ty1,_Ty2&,const std::pair<_Ty1,_Ty2&)' : could not
deduce template argument for 'const std::pair<_Ty1,_Ty2&' from
'const MarchingTriangles::FrontPoint'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\utility(73) : see declaration of 'std::operator`<''
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\functional(139) : error C2676: binary '<' : 'const
MarchingTriangles::FrontPoint' does not define this operator or a
conversion to a type acceptable to the predefined operator
MarchingTriangles.cpp
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\functional(139) : error C2784: 'bool std::operator <(const
std::basic_string<_Elem,_Traits,_Alloc&,const _Elem *)' : could not
deduce template argument for 'const
std::basic_string<_Elem,_Traits,_Ax&' from 'const
MarchingTriangles::FrontPoint'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\string(148) : see declaration of 'std::operator`<''
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\functional(138) : while compiling class-template member function
'bool std::less<_Ty>::operator ()(const _Ty &,const _Ty &) const'
with
[
_Ty=MarchingTriangles::FrontPoint
]
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\set(48) : see reference to class template instantiation
'std::less<_Ty>' being compiled
with
[
_Ty=MarchingTriangles::FrontPoint
]
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\xtree(23) : see reference to class template instantiation
'std::_Tset_traits<_Kty,_Pr,_Alloc,_Mfl>' being compiled
with
[
_Kty=MarchingTriangles::FrontPoint,
_Pr=std::less<MarchingTriangles::FrontPoint>,
_Alloc=std::allocator<MarchingTriangles::FrontPoin t>,
_Mfl=false
]
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\xtree(65) : see reference to class template instantiation
'std::_Tree_nod<_Traits>' being compiled
with
[

_Traits=std::_Tset_traits<MarchingTriangles::Front Point,std::less<MarchingTriangles::FrontPoint>,std ::allocator<MarchingTriangles::FrontPoint>,false>
]
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\xtree(87) : see reference to class template instantiation
'std::_Tree_ptr<_Traits>' being compiled
with
[

_Traits=std::_Tset_traits<MarchingTriangles::Front Point,std::less<MarchingTriangles::FrontPoint>,std ::allocator<MarchingTriangles::FrontPoint>,false>
]
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\xtree(105) : see reference to class template instantiation
'std::_Tree_val<_Traits>' being compiled
with
[

_Traits=std::_Tset_traits<MarchingTriangles::Front Point,std::less<MarchingTriangles::FrontPoint>,std ::allocator<MarchingTriangles::FrontPoint>,false>
]
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\set(57) : see reference to class template instantiation
'std::_Tree<_Traits>' being compiled
with
[

_Traits=std::_Tset_traits<MarchingTriangles::Front Point,std::less<MarchingTriangles::FrontPoint>,std ::allocator<MarchingTriangles::FrontPoint>,false>
]
c:\Work\Project\MuscleBuilder\MarchingTriangles.h( 72) : see
reference to class template instantiation 'std::set<_Kty>' being
compiled
with
[
_Kty=MarchingTriangles::FrontPoint
]
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\functional(139) : error C2784: 'bool std::operator <(const _Elem
*,const std::basic_string<_Elem,_Traits,_Alloc&)' : could not deduce
template argument for 'const T1 *' from 'const
MarchingTriangles::FrontPoint'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\string(138) : see declaration of 'std::operator`<''
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\functional(139) : error C2784: 'bool std::operator <(const
std::basic_string<_Elem,_Traits,_Alloc&,const
std::basic_string<_Elem,_Traits,_Alloc&)' : could not deduce
template argument for 'const std::basic_string<_Elem,_Traits,_Ax&'
from 'const MarchingTriangles::FrontPoint'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\string(128) : see declaration of 'std::operator`<''
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\functional(139) : error C2784: 'bool std::operator <(const
std::vector<_Ty,_Alloc&,const std::vector<_Ty,_Alloc&)' : could
not deduce template argument for 'const std::vector<_Ty,_Ax&' from
'const MarchingTriangles::FrontPoint'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\vector(915) : see declaration of 'std::operator`<''
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\functional(139) : error C2784: 'bool std::operator <(const
std::list<_Ty,_Alloc&,const std::list<_Ty,_Alloc&)' : could not
deduce template argument for 'const std::list<_Ty,_Ax&' from 'const
MarchingTriangles::FrontPoint'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\list(991) : see declaration of 'std::operator`<''
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\functional(139) : error C2784: 'bool std::operator <(const
std::_Tree<_Traits&,const std::_Tree<_Traits&)' : could not deduce
template argument for 'const std::_Tree<_Traits&' from 'const
MarchingTriangles::FrontPoint'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\xtree(1170) : see declaration of 'std::operator`<''
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\functional(139) : error C2784: 'bool std::operator <(const
std::reverse_iterator<_RanIt&,const std::reverse_iterator<_RanIt>
&)' : could not deduce template argument for 'const
std::reverse_iterator<_RanIt&' from 'const
MarchingTriangles::FrontPoint'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\xutility(655) : see declaration of 'std::operator`<''
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\functional(139) : error C2784: 'bool std::operator <(const
std::pair<_Ty1,_Ty2&,const std::pair<_Ty1,_Ty2&)' : could not
deduce template argument for 'const std::pair<_Ty1,_Ty2&' from
'const MarchingTriangles::FrontPoint'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\utility(73) : see declaration of 'std::operator`<''
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\functional(139) : error C2676: binary '<' : 'const
MarchingTriangles::FrontPoint' does not define this operator or a
conversion to a type acceptable to the predefined operator

[red floyd]

Olumide wrote:

Hello,

I've got this nice inner class that I'm holds a set of "FrontPoint"
objects as shown below. Unfortunately, the find and insert methods
trigger massive C2784 errors. Would someone please point out what I'm
doing wrong?

Among other things, you're not posting a minimal compilable example
which exhibits the behavior in question -- see FAQ 5.8 --
http://www.parashift.com/c++-faq-lit...t.html#faq-5.8

>
//////////////////////// code ////////////////////////

struct FrontPoint
{
// stuff
};

class Cell
{
public:
double xMin , xMax, yMin, yMax , zMin , zMax;
Cell *upper , *lower , *north, *south, *east , *west;
Cell::Cell(){ upper = lower = north = south = east = west = NULL; }
set<FrontPoint frontPoint;

void addFrontPoint( FrontPoint& frontPt )
{
frontPoint.insert( frontPt ); // Triggers C2784
}

void removeFrontPoint( FrontPoint& frontPt )
{
set<FrontPoint >::iterator frontPtItx =
frontPoint.find( frontPt ); // Triggers C2784
}
};
//////////////////////// error ////////////////////////

c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include
\functional(139) : error C2784: 'bool std::operator <(const
std::basic_string<_Elem,_Traits,_Alloc&,const _Elem *)' : could not
deduce template argument for 'const
std::basic_string<_Elem,_Traits,_Ax&' from 'const
MarchingTriangles::FrontPoint'

OK, Where and what is MarchingTriangles?
[remainder redacted]

[Olumide]

I've got this nice inner class that ... holds a set of "FrontPoint"

objects as shown below. Unfortunately, the find and insert methods
trigger massive C2784 errors. Would someone please point out what I'm
doing wrong?

Among other things, you're not posting a minimal compilable example
which exhibits the behavior in question -- see FAQ 5.8 --http://www.parashift.com/c++-faq-lite/how-to-post.html#faq-5.8

...

OK, Where and what is MarchingTriangles?
[remainder redacted]

Oops ... Its the name of the parent class of 'FrontPoint' and 'Cell',
and its quite complex, but it worked perfectly, at least it did until
I added add and remove methods to the inner class 'Cell'. Anyway, I
may have solved the problem, by overloading < in the 'FrontPoint',
which I had to change from a struct to a class like so:

class FrontPoint
{
public:
// stuff

bool operator<( const FrontPoint &frontPt );
friend bool operator<(const FrontPoint& frontPt1 , const FrontPoint&
frontPt2 );
};
Interestingly, the code compiles even though, the both "operator<"
methods aren't (yet) implemented. I wonder if I can get away with not
implementing them ... I'm not trying to be cheeky. I just want to know
if the error is due to a fussy compiler that wrongly assumes these
methods will be called.