Thread: linking prob - undefined func, but I believe it's defined.

Here's the code snip:

Code:

template<typename T>
class matrix3
{ ...
  friend vector3<T> operator * (const matrix3<T>& a, const vector3<T>& v);
  ...
};

template<typename T>
vector3<T> operator * (const matrix3<T>& a, const vector3<T>& b) 
{
  // do stuff, 
  return vector3<T>(foo,bar,gah);
}

------

void otherFunc() // in another file
{
  vector3f foo = someMatrix * someVector;
}

But the linker seems to think that the "*" function is not defined for vec = mat * vec:

error LNK2019: unresolved external symbol "class vector3<float> __cdecl operator*(class matrix3<float> const &,class vector3<float> const &)" (??D@YA?AV?$vector3@M@@ABV?$matrix3@M@@ABV0@@Z) referenced in function "void __cdecl otherFunc()"

ideas? Problem with template (again)?

I'm using MSVC .NET on a Win XP machine.

how is your code set up?

this would be the optimal way to set it up:
matrix3.h

Code:

template<typename T>
class matrix3
{ ...
  friend vector3<T> operator * (const matrix3<T>& a, const vector3<T>& v);
  ...
};

matrix3.cpp

Code:

#include "matrix3.h"
template<typename T>
vector3<T> operator * (const matrix3<T>& a, const vector3<T>& b) 
{
  // do stuff, 
  return vector3<T>(foo,bar,gah);
}

otherfile.cpp

Code:

#include "matrix3.h"

void otherFunc() // in another file
{
  vector3f foo = someMatrix * someVector;
}

if it isn't like that, then do it like that, and it should work

it is like that. - matrix.h/cpp, and other.cpp with the call.

other ideas?

what is vector3f? i noticed that in your code, but the linker error says it's looking for vector3<float> are they the same thing?

Originally posted by jverkoey
what is vector3f? i noticed that in your code, but the linker error says it's looking for vector3<float> are they the same thing?

they are... sorry, I should I have been more clear on that...

Code:

typedef vector3<float> vector3f;