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.inse rt( frontPt ); // Triggers C2784
}

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


//////////////////////// error ////////////////////////

c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\functional(139 ) : error C2784: 'bool std::operator <(const
std::basic_stri ng<_Elem,_Trait s,_Alloc&,const _Elem *)' : could not
deduce template argument for 'const
std::basic_stri ng<_Elem,_Trait s,_Ax&' from 'const
MarchingTriangl es::FrontPoint'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\string(148) : see declaration of 'std::operator` <''
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\functional(138 ) : while compiling class-template member function
'bool std::less<_Ty>: :operator ()(const _Ty &,const _Ty &) const'
with
[
_Ty=MarchingTri angles::FrontPo int
]
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\set(48) : see reference to class template instantiation
'std::less<_Ty> ' being compiled
with
[
_Ty=MarchingTri angles::FrontPo int
]
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\xtree(23) : see reference to class template instantiation
'std::_Tset_tra its<_Kty,_Pr,_A lloc,_Mfl>' being compiled
with
[
_Kty=MarchingTr iangles::FrontP oint,
_Pr=std::less<M archingTriangle s::FrontPoint>,
_Alloc=std::all ocator<Marching Triangles::Fron tPoint>,
_Mfl=false
]
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\xtree(65) : see reference to class template instantiation
'std::_Tree_nod <_Traits>' being compiled
with
[

_Traits=std::_T set_traits<Marc hingTriangles:: FrontPoint,std: :less<MarchingT riangles::Front Point>,std::all ocator<Marching Triangles::Fron tPoint>,false>
]
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\xtree(87) : see reference to class template instantiation
'std::_Tree_ptr <_Traits>' being compiled
with
[

_Traits=std::_T set_traits<Marc hingTriangles:: FrontPoint,std: :less<MarchingT riangles::Front Point>,std::all ocator<Marching Triangles::Fron tPoint>,false>
]
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\xtree(105) : see reference to class template instantiation
'std::_Tree_val <_Traits>' being compiled
with
[

_Traits=std::_T set_traits<Marc hingTriangles:: FrontPoint,std: :less<MarchingT riangles::Front Point>,std::all ocator<Marching Triangles::Fron tPoint>,false>
]
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\set(57) : see reference to class template instantiation
'std::_Tree<_Tr aits>' being compiled
with
[

_Traits=std::_T set_traits<Marc hingTriangles:: FrontPoint,std: :less<MarchingT riangles::Front Point>,std::all ocator<Marching Triangles::Fron tPoint>,false>
]
c:\Work\Project \MuscleBuilder\ MarchingTriangl es.h(72) : see
reference to class template instantiation 'std::set<_Kty> ' being
compiled
with
[
_Kty=MarchingTr iangles::FrontP oint
]
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\functional(139 ) : error C2784: 'bool std::operator <(const _Elem
*,const std::basic_stri ng<_Elem,_Trait s,_Alloc&)' : could not deduce
template argument for 'const T1 *' from 'const
MarchingTriangl es::FrontPoint'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\string(138) : see declaration of 'std::operator` <''
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\functional(139 ) : error C2784: 'bool std::operator <(const
std::basic_stri ng<_Elem,_Trait s,_Alloc&,const
std::basic_stri ng<_Elem,_Trait s,_Alloc&)' : could not deduce
template argument for 'const std::basic_stri ng<_Elem,_Trait s,_Ax&'
from 'const MarchingTriangl es::FrontPoint'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\string(128) : see declaration of 'std::operator` <''
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\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
MarchingTriangl es::FrontPoint'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\list(991) : see declaration of 'std::operator` <''
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\functional(139 ) : error C2784: 'bool std::operator <(const
std::_Tree<_Tra its&,const std::_Tree<_Tra its&)' : could not deduce
template argument for 'const std::_Tree<_Tra its&' from 'const
MarchingTriangl es::FrontPoint'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\xtree(1170) : see declaration of 'std::operator` <''
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\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 MarchingTriangl es::FrontPoint'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\vector(915) : see declaration of 'std::operator` <''
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\functional(139 ) : error C2784: 'bool std::operator <(const
std::reverse_it erator<_RanIt&, const std::reverse_it erator<_RanIt>
&)' : could not deduce template argument for 'const
std::reverse_it erator<_RanIt&' from 'const
MarchingTriangl es::FrontPoint'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\xutility(655) : see declaration of 'std::operator` <''
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\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 MarchingTriangl es::FrontPoint'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\utility(73) : see declaration of 'std::operator` <''
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\functional(139 ) : error C2676: binary '<' : 'const
MarchingTriangl es::FrontPoint' does not define this operator or a
conversion to a type acceptable to the predefined operator
MarchingTriangl es.cpp
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\functional(139 ) : error C2784: 'bool std::operator <(const
std::basic_stri ng<_Elem,_Trait s,_Alloc&,const _Elem *)' : could not
deduce template argument for 'const
std::basic_stri ng<_Elem,_Trait s,_Ax&' from 'const
MarchingTriangl es::FrontPoint'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\string(148) : see declaration of 'std::operator` <''
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\functional(138 ) : while compiling class-template member function
'bool std::less<_Ty>: :operator ()(const _Ty &,const _Ty &) const'
with
[
_Ty=MarchingTri angles::FrontPo int
]
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\set(48) : see reference to class template instantiation
'std::less<_Ty> ' being compiled
with
[
_Ty=MarchingTri angles::FrontPo int
]
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\xtree(23) : see reference to class template instantiation
'std::_Tset_tra its<_Kty,_Pr,_A lloc,_Mfl>' being compiled
with
[
_Kty=MarchingTr iangles::FrontP oint,
_Pr=std::less<M archingTriangle s::FrontPoint>,
_Alloc=std::all ocator<Marching Triangles::Fron tPoint>,
_Mfl=false
]
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\xtree(65) : see reference to class template instantiation
'std::_Tree_nod <_Traits>' being compiled
with
[

_Traits=std::_T set_traits<Marc hingTriangles:: FrontPoint,std: :less<MarchingT riangles::Front Point>,std::all ocator<Marching Triangles::Fron tPoint>,false>
]
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\xtree(87) : see reference to class template instantiation
'std::_Tree_ptr <_Traits>' being compiled
with
[

_Traits=std::_T set_traits<Marc hingTriangles:: FrontPoint,std: :less<MarchingT riangles::Front Point>,std::all ocator<Marching Triangles::Fron tPoint>,false>
]
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\xtree(105) : see reference to class template instantiation
'std::_Tree_val <_Traits>' being compiled
with
[

_Traits=std::_T set_traits<Marc hingTriangles:: FrontPoint,std: :less<MarchingT riangles::Front Point>,std::all ocator<Marching Triangles::Fron tPoint>,false>
]
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\set(57) : see reference to class template instantiation
'std::_Tree<_Tr aits>' being compiled
with
[

_Traits=std::_T set_traits<Marc hingTriangles:: FrontPoint,std: :less<MarchingT riangles::Front Point>,std::all ocator<Marching Triangles::Fron tPoint>,false>
]
c:\Work\Project \MuscleBuilder\ MarchingTriangl es.h(72) : see
reference to class template instantiation 'std::set<_Kty> ' being
compiled
with
[
_Kty=MarchingTr iangles::FrontP oint
]
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\functional(139 ) : error C2784: 'bool std::operator <(const _Elem
*,const std::basic_stri ng<_Elem,_Trait s,_Alloc&)' : could not deduce
template argument for 'const T1 *' from 'const
MarchingTriangl es::FrontPoint'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\string(138) : see declaration of 'std::operator` <''
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\functional(139 ) : error C2784: 'bool std::operator <(const
std::basic_stri ng<_Elem,_Trait s,_Alloc&,const
std::basic_stri ng<_Elem,_Trait s,_Alloc&)' : could not deduce
template argument for 'const std::basic_stri ng<_Elem,_Trait s,_Ax&'
from 'const MarchingTriangl es::FrontPoint'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\string(128) : see declaration of 'std::operator` <''
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\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 MarchingTriangl es::FrontPoint'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\vector(915) : see declaration of 'std::operator` <''
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\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
MarchingTriangl es::FrontPoint'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\list(991) : see declaration of 'std::operator` <''
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\functional(139 ) : error C2784: 'bool std::operator <(const
std::_Tree<_Tra its&,const std::_Tree<_Tra its&)' : could not deduce
template argument for 'const std::_Tree<_Tra its&' from 'const
MarchingTriangl es::FrontPoint'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\xtree(1170) : see declaration of 'std::operator` <''
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\functional(139 ) : error C2784: 'bool std::operator <(const
std::reverse_it erator<_RanIt&, const std::reverse_it erator<_RanIt>
&)' : could not deduce template argument for 'const
std::reverse_it erator<_RanIt&' from 'const
MarchingTriangl es::FrontPoint'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\xutility(655) : see declaration of 'std::operator` <''
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\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 MarchingTriangl es::FrontPoint'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\utility(73) : see declaration of 'std::operator` <''
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\functional(139 ) : error C2676: binary '<' : 'const
MarchingTriangl es::FrontPoint' does not define this operator or a
conversion to a type acceptable to the predefined operator

[red floyd]

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

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-lite/how-to-post.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.inse rt( frontPt ); // Triggers C2784
}
>
void removeFrontPoin t( FrontPoint& frontPt )
{
set<FrontPoint >::iterator frontPtItx =
frontPoint.find ( frontPt ); // Triggers C2784
}
};
>
>
//////////////////////// error ////////////////////////
>
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\includ e
\functional(139 ) : error C2784: 'bool std::operator <(const
std::basic_stri ng<_Elem,_Trait s,_Alloc&,const _Elem *)' : could not
deduce template argument for 'const
std::basic_stri ng<_Elem,_Trait s,_Ax&' from 'const
MarchingTriangl es::FrontPoint'

OK, Where and what is MarchingTriangl es?
[remainder redacted]

[Olumide]

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

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.c om/c++-faq-lite/how-to-post.html#faq-5.8
>
...
>
OK, Where and what is MarchingTriangl es?
[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.