Re: [Dev-C++] templates + linker error

The reason for the error is you are not passing the obj file of calc.cpp
to the linker. Make appropriate settings in DevCpp. I think, you have to
add calc.cpp to your project. Sorry I dont use DevCpp.


On Sun, 2008-05-25 at 16:42 -0500, Jorge Guevara wrote:
> 
> i have 3 source  calc.h calc.cpp and principal.cpp (i compilated it
> with devcpp)
> 
> i have this error:
> In function `main':
> [Linker error] undefined reference to `calc<double>::multiply(double,
> double)'
> ld returned 1 exit status
> [Build Error] ["Proyecto] Error 1
> 
> somebody could help me please :)
> 
> /********calc.h******/
> #ifndef _CALC_H
> #define _CALC_H
> 
> template <class A_Type> class calc
> {
> public:
> A_Type multiply(A_Type x, A_Type y);
> A_Type add(A_Type x, A_Type y);
> 
> };
> 
> #endif
> 
> /****calc.cpp******/
> #include "calc.h"
> #include <iostream>
> using namespace std;
> 
> template <class A_Type> A_Type calc<A_Type>::multiply(A_Type x,A_Type
> y)
> {
> return x*y;
> }
> template <class A_Type> A_Type calc<A_Type>::add(A_Type x, A_Type y)
> {
> return x+y;
> }
> 
> 
> /******principal.cpp*****/
> #include "calc.h"
> #include <iostream>
> #include <cstdlib>
> 
> using namespace std;
> 
> int main()
> {
> calc <double> a_calc_class;
> double a, b;
> a=4.3;
> b=3.4;
> a_calc_class.multiply(a,b);
> 
> system("PAUSE");
> return EXIT_SUCCESS;
> }
> /***************************/
> 
> 
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