Avoiding Error: referenced symbol not found in STL matrix

Question

Hi,
in Sun WorkShop 6 update 2 C++ 5.3 2001/05/15 there is a well known problem when STL classes are used. For example, the following code:
#include <vector>
int main()
std::vector<int> myVector;
myVector.push_back(1);
will cause a linking error:
symbol std::vector::__insert_aux : referenced symbol not found.
There is a workaround in:
http://forum.java.sun.com/thread.jspa?forumID=850&threadID=5069680
Some recommended link options are provided in:
http://forum.java.sun.com/thread.jspa?forumID=850&threadID=5104725
Once solved this problem, something similar happens when I try to build a matrix using nested templates std::vector:
// Matrix defined in my class.
class myClass
public:
std::vector<std::vector<double> > matrix;
Of course, I want to use the matrix dynamically:
int main ()
myClass object;
// Create a matrix with Nrows rows.
object.matrix = std::vector<std::vector<double> > (Nrows);
// etc ...
This code will cause the following referenced symbol not found error at linking:
$ echo __1cDstdGvector4n0AGvector4Cdn0AJallocator4Cd____n0AJallocator4n0C____2G6Mrk1_r1_ | c++filt
std::vector<std::vector<double,std::allocator<double> >,std::allocator<std::vector<double,std::allocator<double> > > >&std::vector<std::vector<double,std::allocator<double> >,std::allocator<std::vector<double,std::allocator<double> > > >::operator=(const std::vector<std::vector<double,std::allocator<double> >,std::allocator<std::vector<double,std::allocator<double> > > >&)
so the matter is that the operator = is not found for matrix as a nested template. std::vector::push_back method cannot also be used, as shown above.
I have found a workaround to avoid this linking error:
int main ()
myClass object;
// Create a matrix with Nrows rows.
std::vector<std::vector<double> > auxiliarMatrix (Nrows);
object.matrix.swap (auxiliarMatrix);
// Now matrix can be filled:
for(int nCont=0; nCont < Nrows; nCont++)
std::vector<double> auxiliarVector;
// Vector must be filled first...
object.matrix[nCont] = auxiliarVector;
// etc ...
std::vector::swap method exchanges auxiliarMatrix and object.matrix, so now I have a matrix with the required size. And, very important, doesn't cause linking error in my case.
Hope this may be useful for somebody.
Bye.

Answer 1

Hi,
in Sun WorkShop 6 update 2 C++ 5.3 2001/05/15 there is a well known problem when STL classes are used. For example, the following code:
#include <vector>
int main()
std::vector<int> myVector;
myVector.push_back(1);
will cause a linking error:
symbol std::vector::__insert_aux : referenced symbol not found.
There is a workaround in:
http://forum.java.sun.com/thread.jspa?forumID=850&threadID=5069680
Some recommended link options are provided in:
http://forum.java.sun.com/thread.jspa?forumID=850&threadID=5104725
Once solved this problem, something similar happens when I try to build a matrix using nested templates std::vector:
// Matrix defined in my class.
class myClass
public:
std::vector<std::vector<double> > matrix;
Of course, I want to use the matrix dynamically:
int main ()
myClass object;
// Create a matrix with Nrows rows.
object.matrix = std::vector<std::vector<double> > (Nrows);
// etc ...
This code will cause the following referenced symbol not found error at linking:
$ echo __1cDstdGvector4n0AGvector4Cdn0AJallocator4Cd____n0AJallocator4n0C____2G6Mrk1_r1_ | c++filt
std::vector<std::vector<double,std::allocator<double> >,std::allocator<std::vector<double,std::allocator<double> > > >&std::vector<std::vector<double,std::allocator<double> >,std::allocator<std::vector<double,std::allocator<double> > > >::operator=(const std::vector<std::vector<double,std::allocator<double> >,std::allocator<std::vector<double,std::allocator<double> > > >&)
so the matter is that the operator = is not found for matrix as a nested template. std::vector::push_back method cannot also be used, as shown above.
I have found a workaround to avoid this linking error:
int main ()
myClass object;
// Create a matrix with Nrows rows.
std::vector<std::vector<double> > auxiliarMatrix (Nrows);
object.matrix.swap (auxiliarMatrix);
// Now matrix can be filled:
for(int nCont=0; nCont < Nrows; nCont++)
std::vector<double> auxiliarVector;
// Vector must be filled first...
object.matrix[nCont] = auxiliarVector;
// etc ...
std::vector::swap method exchanges auxiliarMatrix and object.matrix, so now I have a matrix with the required size. And, very important, doesn't cause linking error in my case.
Hope this may be useful for somebody.
Bye.